Currently, the methods in a method list are bound to certain instances. This causes the method list has to be reloaded on each call to correct the instances (see function doInvokeMethodList in gbindcommon.cpp), and the logic is also weird.

The solution: the method list should hold class information for each method instead of instance, then on each call, cast the passed-in object instance to correct one. This will decouple method list from instance and reuse any method list information.

I will work on it soon though seems there is a lot of work

I believe that file gsetter.h (include/cpgf/accessor/gsetter.h) has mistake in the line 133 .
Instead of PolicyHasRule<Policy, GMetaRuleGetterExplicitThis>::Result
should be PolicyHasRule<Policy, GMetaRuleSetterExplicitThis>::Result

A silly question, if I want to expose [char *foo()] to script, how do I allocate the memory?
malloc or new char[]?

Or how to create and return a string native-to-script?

I think I've found a bug in the Tweening library, specifically with the GTween class.

If I understand correctly, calling GTween.target(accessor, fromValue, targetValue) should explicitly set both the start and end value of the tweening animation. However, the fromValue is ignored. Instead, the start value is determined from the current value of the object that the accessor references, regardless of calling target(accessor, targetValue) or target(access, fromValue, targetValue).

I am able to reproduce this with the following code.

// Initialize the animation
// impl->progressAnimValue = startValue;
impl->progressAnim.target(cpgf::createAccessor(impl.get(), &ProgressBarImpl::progressAnimValue, &ProgressBarImpl::progressAnimValue), startValue, endValue)
    .duration(1.0F)
    .ease(cpgf::LinearEase::easeInOut());
impl->progressAnim.restart();
impl->progressAnim.immediateTick();

impl->progressAnimValue is the floating point value that I am animating. startValue and endValue are the start and end values that should be tweened between. If I leave the line impl->progressAnimValue = startValue commented out, I get unexpected behavior that I can tell is the result of GTween using the current (wrong) value of impl->progressAnimValue as a starting value, instead of usingstartValue. Uncommenting that line of code results in the expected behavior.

Hi @wqking,

Sometimes its necessary to "disown" a pointer that is already managed by cpgf (GC-wise), however I cannot find an easy way to do this.

e.g. when implementing a script wrapper, I have:

        if(func)
        {
            return cpgf::fromVariant<QSGNode * >(cpgf::invokeScriptFunction(func.get(), this, __arg0, __arg1));
        }

which invokes a function, that creates an object and returns it. At this point I know that the pointer will be taken over by the framework in C++ and I'd like cpgf not to GC it later.

As the returned GVariant does not contain this information I see several ways of thinking:

1. find the returned GVariant in the class pool object and set GC to false. The drawback is that at this point I don't have the main ScriptObject to start looking for the glue data, except if I make it global, which wouldn't fit as a generic solution for metagen.
2. add another method similar to cpgf::invokeScriptFunction which disowns the result at the end. This doesn't require the global object, however it involves lots of changes as this goes down to a specific scripting engine implementation (thats where the ScriptValues are converted to GVariant.
3. implement disown method in the core library, invokable in the target script. This requires the target script user to know about pointers and call it every time. Its cleaner to leave this to the framework integrators, as at least this specific example is only for the returned values from a custom (script wrapped) method.

Do you have any alternative suggestions? Which of the options would you choose?

Thanks.

Hello,

first of all, thank you for that big library with many nice features.

Currently I build a program that exposes some C++ classes to scripts.
During some tests to check if there are memory leaks while using this classes in scripts, I figured out, that destructors of those exposed classes never get called.

if I write a script like:

for x in range(0, 50000):
	obj = ClassObject()
	obj.textattribute = "Hello"
	print("Created object.")

I would expect that python cleans up the objects at some time.
If my class has a destructor with some log outputs, I can see, that the destructor never gets called.

Am I doing something wrong, or is this supposed to be the case, that exposed meta classes destructors aren't registered in script interfaces ?

Regards

In languages with reflection support, it is very common to work with a base class types, and access the derived methods and properties. How can I do this with cpgf?
At the moment I only found cpgf::findMetaClass which takes a string. But I have a base object instance, I don't have the actual name...

The include file "cpgf/gtestutil.h" is not found and GTestRegister is not defined.

if an object has been deleted by C++ while its still kept in V8 (and cpgf), the V8 GC will cause cpgf to do invalid reads:

    8 ==27206== Invalid read of size 8                                                                    
    9 ==27206==    at 0x4B3B2B8: cpgf::variant_internal::CastFromVariant<void*, cpgf::VarantCastKeepConstRef>::cast(cpgf::GVariant const&) (in cpgf-build/build/libcpgf.so)
   10 ==27206==    by 0x4B4164E: cpgf::bind_internal::getGlueDataInstance(cpgf::GSharedPointer<cpgf::bind_internal::GGlueData> const&) (in cpgf-build/build/libcpgf.so)
   11 ==27206==    by 0x4BA2DB6: cpgf::bind_internal::GScriptObjectCache<cpgf::GSharedPointer<v8::Persistent<v8::Object, v8::NonCopyablePersistentTraits<v8::Object> > > >::                freeScriptObject(cpgf::bind_internal::GGlueDataWrapper*) (in cpgf-build/build/libcpgf.so)
   12 ==27206==    by 0x4B9B7F9: void cpgf::(anonymous namespace)::weakHandleCallback<v8::Object>(v8::Isolate*, v8::Persistent<v8::Object, v8::NonCopyablePersistentTraits<v8::             Object> >*, cpgf::bind_internal::GGlueDataWrapper*) (in cpgf-build/build/libcpgf.so)
   13 ==27206==    by 0x4F6009C: v8::internal::GlobalHandles::PostGarbageCollectionProcessing(v8::internal::GarbageCollector, v8::internal::GCTracer*) (in lib/node/deps/v8/out/native/lib.target/libv8.so)

   51 ==27206== Invalid read of size 8                                                                    
   52 ==27206==    at 0x4B3B2B8: cpgf::variant_internal::CastFromVariant<void*, cpgf::VarantCastKeepConstRef>::cast(cpgf::GVariant const&) (in cpgf-build/build/libcpgf.so)
   53 ==27206==    by 0x4B3D458: cpgf::bind_internal::GObjectInstance::~GObjectInstance() (in cpgf-build/build/libcpgf.so)
   54 ==27206==    by 0x4B3DDA8: cpgf::bind_internal::GObjectGlueData::~GObjectGlueData() (in cpgf-build/build/libcpgf.so)
   55 ==27206==    by 0x4B3DD38: cpgf::bind_internal::GObjectGlueData::~GObjectGlueData() (in cpgf-build/build/libcpgf.so)
   56 ==27206==    by 0x4BA3743: cpgf::bind_internal::GGlueDataWrapperImplement<cpgf::GSharedPointer<cpgf::bind_internal::GObjectGlueData> >::~GGlueDataWrapperImplement() (in cpgf-build/build/libcpgf.so)
   57 ==27206==    by 0x4B9B81C: void cpgf::(anonymous namespace)::weakHandleCallback<v8::Object>(v8::Isolate*, v8::Persistent<v8::Object, v8::NonCopyablePersistentTraits<v8::             Object> >*, cpgf::bind_internal::GGlueDataWrapper*) (in cpgf-build/build/libcpgf.so)
   58 ==27206==    by 0x4F6009C: v8::internal::GlobalHandles::PostGarbageCollectionProcessing(v8::internal::GarbageCollector, v8::internal::GCTracer*) (in lib/node/deps/v8/out/native/lib.target/libv8.so)

   94 ==27206== Invalid read of size 8                                                                    
   95 ==27206==    at 0x4B3B2B8: cpgf::variant_internal::CastFromVariant<void*, cpgf::VarantCastKeepConstRef>::cast(cpgf::GVariant const&) (in cpgf-build/build/libcpgf.so)
   96 ==27206==    by 0x4B3D6F2: cpgf::bind_internal::GClassPool::objectDestroyed(cpgf::bind_internal::GObjectInstance const*) (in cpgf-build/build/libcpgf.so)
   97 ==27206==    by 0x4B3D4AD: cpgf::bind_internal::GObjectInstance::~GObjectInstance() (in cpgf-build/build/libcpgf.so)
   98 ==27206==    by 0x4B3DDA8: cpgf::bind_internal::GObjectGlueData::~GObjectGlueData() (in cpgf-build/build/libcpgf.so)
   99 ==27206==    by 0x4B3DD38: cpgf::bind_internal::GObjectGlueData::~GObjectGlueData() (in cpgf-build/build/libcpgf.so)
  100 ==27206==    by 0x4BA3743: cpgf::bind_internal::GGlueDataWrapperImplement<cpgf::GSharedPointer<cpgf::bind_internal::GObjectGlueData> >::~GGlueDataWrapperImplement() (in cpgf-build/build/libcpgf.so)
  101 ==27206==    by 0x4B9B81C: void cpgf::(anonymous namespace)::weakHandleCallback<v8::Object>(v8::Isolate*, v8::Persistent<v8::Object, v8::NonCopyablePersistentTraits<v8::             Object> >*, cpgf::bind_internal::GGlueDataWrapper*) (in cpgf-build/build/libcpgf.so)
  102 ==27206==    by 0x4F6009C: v8::internal::GlobalHandles::PostGarbageCollectionProcessing(v8::internal::GarbageCollector, v8::internal::GCTracer*) (in lib/node/deps/v8/out/native/lib.target/libv8.so)

CPGF should /not/ try to read the address just yet, it should only use it as:
a) hash for the cache lookups, (not accessing the mem location itself)
b) pass to the object life manager, again, simply as a value (in my case the object life manager will know that C++ has deleted the object)

Is there a reason why CastFromVariant is trying to read it?

the new version (currently yet unreleased develop HEAD) disallows setting script object properties that are not defined in the C++ class.

while this new functionality is correct, persisting object data is still a required functional that I've used for these distinct purposes:

1. when overriding a c++ class in js, persisting data purely used in the new js code of that class
2. setting object dependencies for GC not to delete them.

1st case could be supported by adding specific functionality in the shared wrapper class, although I am not sure yet how to implement support for 2nd usage nicely.

Hi @wqking ,

I found Performance benchmark for cpgf callback in http://www.cpgf.org/ as following, I want to confirm the elapsed time following is total time for 100M iterations or just average time for a single call?

Hi,

What's the best way to go about building meta data for std::string and exposing it to scripts? I noticed you've already built meta data for stl vectors and arrays, so I'm curious if you have done anything special for strings?

When I try to do the following:

GDefineMetaClass<std::string>
      ::define("STLString")
      ._method("c_str", (typename std::string::value_type* (std::string::*)(void) const)&std::string::c_str);

I get this linker error:

Undefined symbols for architecture x86_64:
  "std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::c_str() const", referenced from:

All I really need is the ability to call c_str() so I can compare them to lua strings easily. I'm working around it for now by defining a function that takes a std::string and returns a const char*, and exposing that function as a global. I'm sorry if this is not the right place to post this type of question.

Hi,
In the reflection library documentation, I could not find how to get the function pointer form GMetaMethod. Does anyone know how to do that?

Hi Again,

I'm trying to expose glm functions for vectors via cpgf. GLM uses templated inline functions. When I attempt to do this:

GDefineMetaGlobal()
      ._method("cross", (glm::vec3(glm::vec3 const &, glm::vec3 const &))&glm::cross)
      ._method("someOtherFunc", &someOtherFunc);

It compiles fine with Apple's build chain but cross is not exposed and someOtherFunc is also not exposed. If I remove the "cross" line then "someOtherFunc" is successfully exposed. It seems that anytime I try to expose a templated glm method the rest of my methods are ignored. The only work around I've found so far is to define my own non-templated overloaded methods for glm and expose those instead. I'd like to avoid that workaround if possible since it's a lot of work.

Please let me know if there is a better forum for this type of question (when I'm not sure if it's a bug or a support request).

Thanks,
Kris

1>------ 已启动生成: 项目: sampleserialization, 配置: Release Win32 ------
1>生成启动时间为 2018/6/14 21:41:12。
1>InitializeBuildStatus:
1> 正在对“sampleserialization.dir\Release\sampleserialization.unsuccessfulbuild”执行 Touch 任务。
1>CustomBuild:
1> 所有输出均为最新。
1>ClCompile:
1> object.cpp
1>D:\reflection\cpgf-1.5.6\build..\include\cpgf/gtypetraits.h(503): error C2664: “check”: 不能将参数 1 从“MyData”转换为“bool”
1> 没有可用于执行该转换的用户定义的转换运算符，或者无法调用该运算符
1> D:\reflection\cpgf-1.5.6\build..\include\cpgf/gtypetraits.h(617): 参见对正在编译的类 模板 实例化“cpgf::IsConvertible<From,To>”的引用
1> with
1> [
1> From=MyData,
1> To=int
1> ]
1> D:\reflection\cpgf-1.5.6\build..\include\cpgf/genableif.h(19): 参见对正在编译的类 模板 实例化“cpgf::IsEnum”的引用
1> with
1> [
1> T=MyData
1> ]
1> D:\reflection\cpgf-1.5.6\build..\include\cpgf/private/gvartypedata_p.h(119): 参见对正在编译的类 模板 实例化“cpgf::GEnableIfResult<C,T>”的引用
1> with
1> [
1> C=cpgf::IsEnum,
1> T=void
1> ]
1> D:\reflection\cpgf-1.5.6\build..\include\cpgf/gvartypedata.h(185): 参见对正在编译的类 模板 实例化“cpgf::variant_internal::DeduceVariantType”的引用
1> with
1> [
1> T=MyData
1> ]
1> D:\reflection\cpgf-1.5.6\build..\include\cpgf/private/gmetafield_p.h(188): 参见对正在编译的函数 模板 实例化“void cpgf::deduceVariantType(cpgf::GVarTypeData &,bool)”的引用
1> with
1> [
1> FT=MyData
1> ]
1> D:\reflection\cpgf-1.5.6\build..\include\cpgf/private/gmetafield_p.h(152): 参见对正在编译的函数 模板 实例化“cpgf::GVariant cpgf::meta_internal::GMetaFieldDataMember<OT,FT,Policy>::doGet(const void *) const”的引用
1> with
1> [
1> OT=MyObject,
1> FT=MyData,
1> Policy=cpgf::MakePolicy<>
1> ]
1> D:\reflection\cpgf-1.5.6\build..\include\cpgf/private/gmetafield_p.h(151): 编译类 模板 成员函数“cpgf::GVariant cpgf::meta_internal::GMetaFieldDataMember<OT,FT,Policy>::virtualGet(const void *,const void )”时
1> with
1> [
1> OT=MyObject,
1> FT=MyData,
1> Policy=cpgf::MakePolicy<>
1> ]
1> D:\reflection\cpgf-1.5.6\build..\include\cpgf/gmetafield.h(20): 参见对正在编译的类 模板 实例化“cpgf::meta_internal::GMetaFieldDataMember<OT,FT,Policy>”的引用
1> with
1> [
1> OT=MyObject,
1> FT=MyData,
1> Policy=cpgf::MakePolicy<>
1> ]
1> D:\reflection\cpgf-1.5.6\build..\include\cpgf/gmetadefine.h(269): 参见对正在编译的函数 模板 实例化“cpgf::GMetaField::GMetaField<MyObject,MyData,cpgf::MakePolicy<>>(const char ,FT MyObject:: ,const Policy &)”的引用
1> with
1> [
1> FT=MyData,
1> Policy=cpgf::MakePolicy<>
1> ]
1> ....\samples\serialization\object.cpp(108): 参见对正在编译的函数 模板 实例化“cpgf::GDefineMetaField cpgf::GDefineMetaCommon<ClassT,DerivedType>::_field<MyDataMyObject:: >(const char ,FT)”的引用
1> with
1> [
1> BaseType=cpgf::GDefineMetaClass,
1> ClassT=MyObject,
1> DerivedType=cpgf::GDefineMetaClass,
1> FT=MyData MyObject::
1> ]
1> ....\samples\serialization\object.cpp(232): 参见对正在编译的函数 模板 实例化“void register_MyObjectcpgf::GDefineMetaGlobal(D)”的引用
1> with
1> [
1> D=cpgf::GDefineMetaGlobal
1> ]
1>D:\reflection\cpgf-1.5.6\build..\include\cpgf/gtypetraits.h(503): error C2866: “cpgf::IsConvertible<From,To>::Result”: 托管类型的常量静态数据成员必须在声明时初始化
1> with
1> [
1> From=MyData,
1> To=int
1> ]
1>D:\reflection\cpgf-1.5.6\build..\include\cpgf/gtypetraits.h(617): error C2057: 应输入常量表达式
1>D:\reflection\cpgf-1.5.6\build..\include\cpgf/genableif.h(19): error C2975: “unnamed-parameter”:“cpgf::GEnableIf”的模板参数无效，应为编译时常量表达式
1> D:\reflection\cpgf-1.5.6\build..\include\cpgf/genableif.h(9) : 参见“unnamed-parameter”的声明
1>D:\reflection\cpgf-1.5.6\build..\include\cpgf/gtypetraits.h(503): error C2664: “check”: 不能将参数 1 从“const MyData”转换为“bool”
1> 没有可用于执行该转换的用户定义的转换运算符，或者无法调用该运算符
1> D:\reflection\cpgf-1.5.6\build..\include\cpgf/genableif.h(19): 参见对正在编译的类 模板 实例化“cpgf::IsConvertible<From,To,Enabled>”的引用
1> with
1> [
1> From=const MyData &,
1> To=const cpgf::IObject &,
1> Enabled=void
1> ]
1> D:\reflection\cpgf-1.5.6\build..\include\cpgf/gvartypedata.h(185): 参见对正在编译的类 模板 实例化“cpgf::GEnableIfResult<C,T>”的引用
1> with
1> [
1> C=cpgf::IsConvertible<const MyData &,const cpgf::IObject &,void>,
1> T=void
1> ]
1> D:\reflection\cpgf-1.5.6\build..\include\cpgf/private/gmetafield_p.h(188): 参见对正在编译的函数 模板 实例化“void cpgf::deduceVariantType(cpgf::GVarTypeData &,bool)”的引用
1> with
1> [
1> FT=MyData *
1> ]
1> D:\reflection\cpgf-1.5.6\build..\include\cpgf/private/gmetafield_p.h(152): 参见对正在编译的函数 模板 实例化“cpgf::GVariant cpgf::meta_internal::GMetaFieldDataMember<OT,FT,Policy>::doGet(const void *) const”的引用
1> with
1> [
1> OT=MyObject,
1> FT=MyData *,
1> Policy=cpgf::MakePolicy<>
1> ]
1> D:\reflection\cpgf-1.5.6\build..\include\cpgf/private/gmetafield_p.h(151): 编译类 模板 成员函数“cpgf::GVariant cpgf::meta_internal::GMetaFieldDataMember<OT,FT,Policy>::virtualGet(const void *,const void *)”时
1> with
1> [
1> OT=MyObject,
1> FT=MyData ,
1> Policy=cpgf::MakePolicy<>
1> ]
1> D:\reflection\cpgf-1.5.6\build..\include\cpgf/gmetafield.h(20): 参见对正在编译的类 模板 实例化“cpgf::meta_internal::GMetaFieldDataMember<OT,FT,Policy>”的引用
1> with
1> [
1> OT=MyObject,
1> FT=MyData ,
1> Policy=cpgf::MakePolicy<>
1> ]
1> D:\reflection\cpgf-1.5.6\build..\include\cpgf/gmetadefine.h(269): 参见对正在编译的函数 模板 实例化“cpgf::GMetaField::GMetaField<MyObject,MyData,cpgf::MakePolicy<>>(const char ,FT MyObject:: ,const Policy &)”的引用
1> with
1> [
1> FT=MyData ,
1> Policy=cpgf::MakePolicy<>
1> ]
1> ....\samples\serialization\object.cpp(109): 参见对正在编译的函数 模板 实例化“cpgf::GDefineMetaField cpgf::GDefineMetaCommon<ClassT,DerivedType>::_field<MyDataMyObject:: >(const char *,FT)”的引用
1> with
1> [
1> BaseType=cpgf::GDefineMetaClass,
1> ClassT=MyObject,
1> DerivedType=cpgf::GDefineMetaClass,
1> FT=MyData MyObject::
1> ]
1>D:\reflection\cpgf-1.5.6\build..\include\cpgf/gtypetraits.h(503): error C2866: “cpgf::IsConvertible<From,To,Enabled>::Result”: 托管类型的常量静态数据成员必须在声明时初始化
1> with
1> [
1> From=const MyData &,
1> To=const cpgf::IObject &,
1> Enabled=void
1> ]
1>D:\reflection\cpgf-1.5.6\build..\include\cpgf/genableif.h(19): error C2975: “unnamed-parameter”:“cpgf::GEnableIf”的模板参数无效，应为编译时常量表达式
1> D:\reflection\cpgf-1.5.6\build..\include\cpgf/genableif.h(9) : 参见“unnamed-parameter”的声明
1>D:\reflection\cpgf-1.5.6\build..\include\cpgf/gtypetraits.h(503): error C2070: “void”: 非法的 sizeof 操作数
1> D:\reflection\cpgf-1.5.6\build..\include\cpgf/gtypetraits.h(617): 参见对正在编译的类 模板 实例化“cpgf::IsConvertible<From,To>”的引用
1> with
1> [
1> From=MyData *,
1> To=int
1> ]
1> D:\reflection\cpgf-1.5.6\build..\include\cpgf/genableif.h(19): 参见对正在编译的类 模板 实例化“cpgf::IsEnum”的引用
1> with
1> [
1> T=MyData *
1> ]
1> D:\reflection\cpgf-1.5.6\build..\include\cpgf/private/gvartypedata_p.h(119): 参见对正在编译的类 模板 实例化“cpgf::GEnableIfResult<C,T>”的引用
1> with
1> [
1> C=cpgf::IsEnum<MyData *>,
1> T=void
1> ]
1> D:\reflection\cpgf-1.5.6\build..\include\cpgf/gvartypedata.h(185): 参见对正在编译的类 模板 实例化“cpgf::variant_internal::DeduceVariantType”的引用
1> with
1> [
1> T=MyData *
1> ]
1>
1>生成失败。

if i have a Gvariant t=new Derived
is it possible to get its base class pointer by

fromVariant<Base*>(t)

thanks very much

Hello,

last days, I updated my version of cpgf to the latest master and since then, I get a crash on linux if the application unloads the lib (so after exit(0)).

I did some tracing and found the commit, which is causing the problem for me:
6c8c096 (Replaced cpgf shared pointers with C++ ones.)

Additional informations:

• Since the crash happens, if the lib unloads, it has to be some static variable, which gets unloaded.
• If I don't load a script in my code, the crash happens anyway.
• If I don't call GDefineMetaClass in my code, the crash is gone.

Let me know, if you need any further informations.

Regards

I am registering an Eigen::Matrix which has a const and non const member function called "data".
When I register data via the two function pointers, I get two properties both called data, but neither of them are flagged as const.
I am checking constness with:
method->getItemType().isConstFunction()

I believe this is due to the meta_internal::createPropertyType<Getter, Setter, Policy>() not deducing the constness of the function correctly in the GMetaProperty constructor.

1>------ 已启动生成: 项目: samplereflection, 配置: Release Win32 ------
1>生成启动时间为 2018/6/14 21:37:02。
1>InitializeBuildStatus:
1> 正在对“samplereflection.dir\Release\samplereflection.unsuccessfulbuild”执行 Touch 任务。
1>CustomBuild:
1> 所有输出均为最新。
1>ClCompile:
1> property.cpp
1>D:\reflection\cpgf-1.5.6\build..\include\cpgf/accessor/ggetter.h(157): error C2248: “TestNoncopyable::TestNoncopyable”: 无法访问 private 成员(在“TestNoncopyable”类中声明)
1> d:\reflection\cpgf-1.5.6\samples\reflection\reflect_common.h(85) : 参见“TestNoncopyable::TestNoncopyable”的声明
1> d:\reflection\cpgf-1.5.6\samples\reflection\reflect_common.h(65) : 参见“TestNoncopyable”的声明
1> D:\reflection\cpgf-1.5.6\build..\include\cpgf/accessor/ggetter.h(156): 编译类 模板 成员函数“TestNoncopyable cpgf::GInstanceGetter<RawGetter,Policy>::get(const void ) const”时
1> with
1> [
1> RawGetter=TestNoncopyable anonymous-namespace'::TestObject::* , 1> Policy=cpgf::MakePolicy<cpgf::GMetaRuleForbidRead,cpgf::GMetaRuleForbidWrite> 1> ] 1> D:\reflection\cpgf-1.5.6\build\..\include\cpgf/private/gmetaproperty_p.h(30): 参见对正在编译的类 模板 实例化“cpgf::GInstanceGetter<RawGetter,Policy>”的引用 1> with 1> [ 1> RawGetter=TestNoncopyable anonymous-namespace'::TestObject:: ,
1> Policy=cpgf::MakePolicycpgf::GMetaRuleForbidRead,cpgf::GMetaRuleForbidWrite
1> ]
1> D:\reflection\cpgf-1.5.6\build..\include\cpgf/private/gmetaproperty_p.h(177): 参见对正在编译的类 模板 实例化“cpgf::meta_internal::GMetaGetter<Getter,Policy>”的引用
1> with
1> [
1> Getter=TestNoncopyable anonymous-namespace'::TestObject::* , 1> Policy=cpgf::MakePolicy<cpgf::GMetaRuleForbidRead,cpgf::GMetaRuleForbidWrite> 1> ] 1> D:\reflection\cpgf-1.5.6\build\..\include\cpgf/gmetaproperty.h(20): 参见对正在编译的类 模板 实例化“cpgf::meta_internal::GMetaPropertyData<Getter,Setter,Policy>”的引用 1> with 1> [ 1> Getter=TestNoncopyable anonymous-namespace'::TestObject::* ,
1> Setter=int,
1> Policy=cpgf::MakePolicycpgf::GMetaRuleForbidRead,cpgf::GMetaRuleForbidWrite
1> ]
1> D:\reflection\cpgf-1.5.6\build..\include\cpgf/gmetadefine.h(293): 参见对正在编译的函数 模板 实例化“cpgf::GMetaProperty::GMetaProperty<Getter,Setter,Policy>(const char ,const Getter &,const Setter &,const Policy &)”的引用
1> with
1> [
1> Getter=TestNoncopyable anonymous-namespace'::TestObject::* , 1> Setter=int, 1> Policy=cpgf::MakePolicy<cpgf::GMetaRuleForbidRead,cpgf::GMetaRuleForbidWrite> 1> ] 1> ..\..\samples\reflection\property.cpp(67): 参见对正在编译的函数 模板 实例化“cpgf::GDefineMetaProperty<BaseType> cpgf::GDefineMetaCommon<ClassT,DerivedType>::_property<TestNoncopyableanonymous-namespace'::TestObject:: ,int,cpgf::MakePolicy<T0,T1>>(const char ,const Getter &,const Setter &,const Policy &)”的引用
1> with
1> [
1> BaseType=cpgf::GDefineMetaClass<anonymous-namespace'::TestObject>, 1> ClassT=anonymous-namespace'::TestObject,
1> DerivedType=cpgf::GDefineMetaClass<anonymous-namespace'::TestObject>, 1> T0=cpgf::GMetaRuleForbidRead, 1> T1=cpgf::GMetaRuleForbidWrite, 1> Getter=TestNoncopyable anonymous-namespace'::TestObject:: ,
1> Setter=int,
1> Policy=cpgf::MakePolicycpgf::GMetaRuleForbidRead,cpgf::GMetaRuleForbidWrite
1> ]
1>
1>生成失败。

A compiler warning is thrown (Clang) because the GMetaFundamental class (gmetafundamental.h) is marked final and derived from the abstract GMetaTypedItem class (gmetacommon.h), but unlike all other such derived classes, it does not override the abstract function destroyInPlace().

One of the following changes is needed:

(1) GMetaFundamental::destroyInPlace() be defined,

(2) GMetaTypedItem::destroyInPlace() be made non-abstract (not recommended), or

(3) GMetaFundamental is made non-final.

Hi!

May you help me to figure out how to preserve object script state?
Use cases:

local button = ui::find("button");
button.script_property = "test me"; -- pure script/LUA property

local same_button_as_above = ui::find("button");
print(button.script_property); -- property not found or NIL

I partially solved this with ugly "getScriptState" function but ... it's ugly. :)
May be you have any ideas how to do it in more elegant way using cpgf?

My classes are (simplified):

namspace ui {
class ScriptObject{ /* some helper stuff here */};
class BaseWidget : public ScriptObject { /* ... */};
class Button : public BaseWidget {/* ...*/};

BaseWidget * find(const char* widget_name);
}

Thanks!

PS: http://www.cpgf.org/document/inherit-cpp-class-from-script.html - only works for C++ objects created in script code, right?

It is my understanding that your use of double underscores in the defines is not standard conformant.

http://stackoverflow.com/questions/228783/what-are-the-rules-about-using-an-underscore-in-a-c-identifier

"Each name that contains a double underscore (_ _) or begins with an underscore followed by an uppercase letter (2.11) is reserved to the implementation for any use."

Basically such user defined tags as include guards are just disasters waiting to happen. #pragma once is much safer and almost unanimously supported.

http://en.wikipedia.org/wiki/Pragma_once

I have not checked the exact cause, but even in debug mode the compile times for meta classes are very long. I suspect that a good part of this comes from the simulation of variadic templates with the macros in gpp.h.

define MAX_BASE_COUNT 20

define GPP_MAX_LIMIT 60

define G_MAX_ARITY 30

So the question is: Are there any plans to provide a version that uses variadic templates?

I have multiple dlls. Each dll is a plugin. Every dll needs to register itself using cpgf so that their classes/functions can be reflected.
If cpgf is static linked by each dll, then each dll should have a copy of cpgf, they cannot share a same cpgf instance
The only solution I know is to make cpgf as a dll. so that every plugin can share same cpgf instance.
So my question is

• Is compile cpgf to dll project the only solution (to share same cpgf instance)?
• Is it possible to compile cpgf to dll project? Is it supported already

The code looks extremely nice and browsing the samples, it seems that it offers solid functionality.
I need to save object to json and it seems to be able to that.
So is it wise to use this in a new project ?
Thank you

hi @wqking ,
reading the code, I find it will reload methodlist in doInvokeMethodList of gbindcommon.cpp. Though there is some comments, I cannot understand what is the case the "this" pointer may change.

while the tests pass, these and similar errors are printed during the execution:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
RuntimeError: Can't assign value to enumerator, method, or class.
Traceback (most recent call last):
  File "<string>", line 1, in <module>
RuntimeError: Can't assign value to enumerator, method, or class.
Traceback (most recent call last):
  File "<string>", line 1, in <module>
RuntimeError: Can't assign value to enumerator, method, or class.
Traceback (most recent call last):
  File "<string>", line 1, in <module>
RuntimeError: Can't assign value to enumerator, method, or class.
Traceback (most recent call last):
  File "<string>", line 1, in <module>
RuntimeError: Can't assign value to enumerator, method, or class.
Traceback (most recent call last):
  File "<string>", line 1, in <module>
RuntimeError: Can't assign value to enumerator, method, or class.
Traceback (most recent call last):
  File "<string>", line 1, in <module>
RuntimeError: Can't find matched method to invoke

I've confirmed they are still being printed in 735838d commit, didn't go further back in the history

Hi,

I've used luabind for script binding and then found cpgf and it seems so great, because I always planned to add reflection to my game engine.

But there is a little question regarding the performance.

First, I made a benchmark to test the FindMetaMethod+Invoke scenario on i5-3570K for this class:

class Test
{
public:
  int func(int a, int b)
  {
    return a + b;
  }
};

1. luabind

luabind::module(state)
[
  luabind::class_<Test>("Test")
    .def(constructor<>())
    .def("func", &Test::func)
];

local obj = Test()
for i = 1, 10000000 do
    obj:func(1, 2)
end

This code took 1580ms.

2. cpgf

cpgf::GDefineMetaClass<Test>
  ::define("Test")
  ._method("func", &CpgfTest::func);

Test obj;
cpgf::GMetaClass* t = cpgf::findMetaClass("Test");
for (int i = 0; i < 10000000; ++i)
{
    cpgf::GMetaMethod* m = t->getMethod("func");
    cpgf::fromVariant<int>(m->invoke(&obj, 1, 2));
}

This code took 1135ms, so it's even faster than luabind and I'm happy.

3. cpgf+lua

Modified samples/scriptbind/luabind/constructor.cpp sample - added similar TestObject::func method and bencmarked the last line from next code:

TestLuaContext context;
GScopedInterface<IMetaClass> metaClass(context.getService()->findClassByName("testscript::TestObject"));
context.getBinding()->bindClass("TestObject", metaClass.get());
context.doString("a = TestObject()\nfor i = 1, 1000000 do a.func(1, 2) end\n");

This code took 61332ms, 38 times slower than luabind. I hope I mistaken somewhere.
Please help, because I would like very much to use your excellent library

Сompiler cannot find some objects as the necessary files are apparently missing:
.\cpgf\src\scriptbind\gv8bind.cpp(61): error C2504: 'GShareFromBase': base class undefined .\cpgf\src\scriptbind\gv8bind.cpp(172): error C2504: 'GUserData': base class undefined

Hi @wqking, can metagen support all c++ syntax, such as macro, multiple inheritance etc?

Can I use it to generate meta data from any C++ library or moudle without any worries?

Anything I should know about using metagen?

#include <afxwin.h>         // MFC core and standard components
#ifdef _DEBUG
#define new DEBUG_NEW
#endif
GDefineMetaClass<BodyDeviceModel, DeviceModelBase>
::declare("BodyDeviceModel")
._field("w", &BodyDeviceModel::w)
._field("h", &BodyDeviceModel::h)
;

When running the code above with VS2010, memory leakage is reported. I am not sure if this is a real problem or just a false alarm.

Detected memory leaks!
Dumping objects ->
{523} normal block at 0x00000000020682B0, 80 bytes long.
 Data: <  `             > 01 00 60 00 CD CD CD CD C0 82 06 02 00 00 00 00 
{522} normal block at 0x0000000002068210, 48 bytes long.
 Data: <                > 10 82 06 02 00 00 00 00 10 82 06 02 00 00 00 00 
{521} normal block at 0x0000000002068190, 16 bytes long.
......

Hi,

I'm trying to reflect a simple class as you can see in the complete example in the pastebin link (should compile when an appropriate project is set up). Here, I want to reflect a method and the constructor of class MyController. This is done in static void reflect(Define define). Reflection of methods works fine under Linux and Windows, but the reflection of the (non default) constructor does not compile on Linux using GCC 4.8.2. Here something seems to be different in template syntax between Windows and Linux compiler.
The error is very generic: "expected primary-expression before 'void'" (in line 61)

What is the correct syntax for reflecting this constructor?

http://pastebin.com/pqJiEcL1

Thanks a lot in advance.

Regards
Sebastian

Can't figure out how to build the library. What am I doing wrong?
My system is Ubuntu 12.04 LTS, gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3

selivanov@mail3> cd src/cpgf/build
selivanov@mail3> cmake .
-- Build as debug.
-- Configuring done
-- Generating done
-- Build files have been written to: /home/selivanov/src/cpgf/build

selivanov@mail3> make linux TARGET=lib

-- Build as debug.
-- Configuring done
-- Generating done
-- Build files have been written to: /home/selivanov/src/cpgf/build
make[1]: Вход в каталог `/home/selivanov/src/cpgf/build/temp_cache_linux'
make[1]: *** Нет правила для сборки цели `lib'.  Останов.
make[1]: Выход из каталога `/home/selivanov/src/cpgf/build/temp_cache_linux'
make: *** [linux] Ошибка 2

Hi Sarunas,

There are 3 branches created by you. Can you check to merge or delete them to make the branches cleaner?

Thanks

I change a01_reflect_to_global.cpp and add a simple funtion "nt test(int *& param) const ":
class Point
{
public:
Point() : x(0), y(0) {
}

Point(int x, int y) : x(x), y(y) {
}

void extend(int scale) {
    x *= scale;
    y *= scale;
}

int getArea() const {
    return x * y;
}
int test(int *& param) const {
    param = NULL;
}

public:
int x;
int y;
};
2> a01_reflect_to_global.cpp
2>E:\Engine\cpgf-develop\include\cpgf/private/gmetainvoke_p.h(180): error C2664: “int cpgf::callback_internal::GCallbackAgent_1<int,int *&>::operator ()(int &) const”: 无法将参数 1 从“int *”转换为“int &”
2> E:\Engine\cpgf-develop\include\cpgf/private/gmetainvoke_p.h(180): 编译类 模板 成员函数“cpgf::GVariant cpgf::meta_internal::GMetaInvokeHelper<cpgf::GCallback<int (P0)>,cpgf::GFunctionTraits,1,int,Policy,false,false>::invoke(void *,const CT &,const cpgf::GVariant *const *,size_t)”时
2> with
2> [
2> P0=int *&
2> , Signature=int (int *&)
2> ,

When I compile project "sampleirrlicht", there are some error just like this one. It seems there is a bug when parameters are something like "Type *&"(reference to pointer). Or am I miss anything?

Trying to register boost::function < void() > class field using ._field(name, field) and getting compilation error inside G_STATIC_CONSTANT(bool, Result = (IsSameType<From, To>::Result || (sizeof(check(from)) == sizeof(typetraits_internal::YesType)))) from CastVariantSelector:

Libs\boost\boost/function/function_template.hpp(153): error C2064: term does not evaluate to a function taking 0 arguments
          Libs\boost\boost/function/function_template.hpp(147) : while compiling class template member function 'void boost::detail::function::void_function_obj_invoker0<FunctionObj,R>::invoke(boost::detail::function::function_buffer &)'
          with
          [
              FunctionObj=float
  ,            R=void
          ]
          Libs\boost\boost/function/function_template.hpp(934) : see reference to function template instantiation 'void boost::detail::function::void_function_obj_invoker0<FunctionObj,R>::invoke(boost::detail::function::function_buffer &)' being compiled
          with
          [
              FunctionObj=float
  ,            R=void
          ]
          Libs\boost\boost/function/function_template.hpp(934) : see reference to class template instantiation 'boost::detail::function::void_function_obj_invoker0<FunctionObj,R>' being compiled
          with
          [
              FunctionObj=float
  ,            R=void
          ]
          Libs\boost\boost/function/function_template.hpp(722) : see reference to function template instantiation 'void boost::function0<R>::assign_to<Functor>(Functor)' being compiled
          with
          [
              R=void
  ,            Functor=float
          ]
          Libs\boost\boost/function/function_template.hpp(722) : see reference to function template instantiation 'void boost::function0<R>::assign_to<Functor>(Functor)' being compiled
          with
          [
              R=void
  ,            Functor=float
          ]
          Libs\boost\boost/function/function_template.hpp(1072) : see reference to function template instantiation 'boost::function0<R>::function0<From>(Functor,int)' being compiled
          with
          [
              R=void
  ,            From=float
  ,            Functor=float
          ]
          Libs\boost\boost/function/function_template.hpp(1072) : see reference to function template instantiation 'boost::function0<R>::function0<From>(Functor,int)' being compiled
          with
          [
              R=void
  ,            From=float
  ,            Functor=float
          ]
          Libs\cpgf\include\cpgf/gtypetraits.h(503) : see reference to function template instantiation 'boost::function<void (void)>::function<From>(Functor,int)' being compiled
          with
          [
              From=float
  ,            Functor=float
          ]
          Libs\cpgf\include\cpgf/private/gvariant_p.h(69) : see reference to function template instantiation 'boost::function<void (void)>::function<From>(Functor,int)' being compiled
          with
          [
              From=float
  ,            Functor=float
          ]
          Libs\cpgf\include\cpgf/genableif.h(57) : see reference to class template instantiation 'cpgf::IsConvertible<From,To,void>' being compiled
          with
          [
              From=float
  ,            To=boost::function<void (void)>
          ]
          Libs\cpgf\include\cpgf/genableif.h(19) : see reference to class template instantiation 'cpgf::GOrResult<cpgf::IsConvertible<From,To,void>,cpgf::GAndResult<cpgf::IsEnum<From>,cpgf::IsConvertible<int,To,void>,cpgf::GTrueResult,cpgf::GTrueResult,cpgf::GTrueResult,cpgf::GTrueResult,cpgf::GTrueResult,cpgf::GTrueResult,cpgf::GTrueResult,cpgf::GTrueResult>,cpgf::GAndResult<cpgf::IsEnum<boost::function<void (void)>>,cpgf::IsConvertible<From,int,void>,cpgf::GTrueResult,cpgf::GTrueResult,cpgf::GTrueResult,cpgf::GTrueResult,cpgf::GTrueResult,cpgf::GTrueResult,cpgf::GTrueResult,cpgf::GTrueResult>,cpgf::GFalseResult,cpgf::GFalseResult,cpgf::GFalseResult,cpgf::GFalseResult,cpgf::GFalseResult,cpgf::GFalseResult,cpgf::GFalseResult>' being compiled
          with
          [
              From=float
  ,            To=boost::function<void (void)>
          ]
          Libs\cpgf\include\cpgf/private/gvariant_p.h(133) : see reference to class template instantiation 'cpgf::GEnableIfResult<cpgf::GOrResult<cpgf::IsConvertible<From,To,void>,cpgf::GAndResult<cpgf::IsEnum<From>,cpgf::IsConvertible<int,To,void>,cpgf::GTrueResult,cpgf::GTrueResult,cpgf::GTrueResult,cpgf::GTrueResult,cpgf::GTrueResult,cpgf::GTrueResult,cpgf::GTrueResult,cpgf::GTrueResult>,cpgf::GAndResult<cpgf::IsEnum<boost::function<void (void)>>,cpgf::IsConvertible<From,int,void>,cpgf::GTrueResult,cpgf::GTrueResult,cpgf::GTrueResult,cpgf::GTrueResult,cpgf::GTrueResult,cpgf::GTrueResult,cpgf::GTrueResult,cpgf::GTrueResult>,cpgf::GFalseResult,cpgf::GFalseResult,cpgf::GFalseResult,cpgf::GFalseResult,cpgf::GFalseResult,cpgf::GFalseResult,cpgf::GFalseResult>,void>' being compiled
          with
          [
              From=float
  ,            To=boost::function<void (void)>
          ]
          Libs\cpgf\include\cpgf/private/gvariant_p.h(826) : see reference to class template instantiation 'cpgf::variant_internal::CastVariantHelper<float,boost::function<void (void)>,void>' being compiled
          Libs\cpgf\include\cpgf/private/gvariant_p.h(781) : while compiling class template member function 'boost::function<void (void)> cpgf::variant_internal::CastFromVariant<FT,cpgf::VarantCastKeepConstRef>::cast(const cpgf::GVariant &)'
          with
          [
              FT=F_Void
          ]
          Libs\cpgf\include\cpgf/gvariant.h(212) : see reference to function template instantiation 'boost::function<void (void)> cpgf::variant_internal::CastFromVariant<FT,cpgf::VarantCastKeepConstRef>::cast(const cpgf::GVariant &)' being compiled
          with
          [
              FT=F_Void
          ]
          Libs\cpgf\include\cpgf/private/gmetafield_p.h(201) : see reference to class template instantiation 'cpgf::variant_internal::CastFromVariant<FT,cpgf::VarantCastKeepConstRef>' being compiled
          with
          [
              FT=F_Void
          ]
          Libs\cpgf\include\cpgf/private/gmetafield_p.h(156) : see reference to function template instantiation 'void cpgf::meta_internal::GMetaFieldDataMember<OT,FT,Policy>::doSet<void>(void *,const cpgf::GVariant &) const' being compiled
          with
          [
              OT=Dao::Application
  ,            FT=F_Void
  ,            Policy=cpgf::MakePolicy<cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType>
          ]
          Libs\cpgf\include\cpgf/private/gmetafield_p.h(156) : see reference to function template instantiation 'void cpgf::meta_internal::GMetaFieldDataMember<OT,FT,Policy>::doSet<void>(void *,const cpgf::GVariant &) const' being compiled
          with
          [
              OT=Dao::Application
  ,            FT=F_Void
  ,            Policy=cpgf::MakePolicy<cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType>
          ]
          Libs\cpgf\include\cpgf/private/gmetafield_p.h(155) : while compiling class template member function 'void cpgf::meta_internal::GMetaFieldDataMember<OT,FT,Policy>::virtualSet(const void *,void *,const cpgf::GVariant &)'
          with
          [
              OT=Dao::Application
  ,            FT=F_Void
  ,            Policy=cpgf::MakePolicy<cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType>
          ]
          Libs\cpgf\include\cpgf/private/gmetafield_p.h(180) : see reference to function template instantiation 'void cpgf::meta_internal::GMetaFieldDataMember<OT,FT,Policy>::virtualSet(const void *,void *,const cpgf::GVariant &)' being compiled
          with
          [
              OT=Dao::Application
  ,            FT=F_Void
  ,            Policy=cpgf::MakePolicy<cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType>
          ]
          Libs\cpgf\include\cpgf/gmetafield.h(20) : see reference to class template instantiation 'cpgf::meta_internal::GMetaFieldDataMember<OT,FT,Policy>' being compiled
          with
          [
              OT=Dao::Application
  ,            FT=F_Void
  ,            Policy=cpgf::MakePolicy<cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType>
          ]
          Libs\cpgf\include\cpgf/gmetadefine.h(270) : see reference to function template instantiation 'cpgf::GMetaField::GMetaField<Dao::Application,F,cpgf::MakePolicy<cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType>>(const char *,FT Dao::Application::* ,const Policy &)' being compiled
          with
          [
              F=F_Void
  ,            FT=F_Void
  ,            Policy=cpgf::MakePolicy<cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType,cpgf::GNullType>
          ]
          Reflection/Reflection.h(457) : see reference to function template instantiation 'cpgf::GDefineMetaField<DerivedType> cpgf::GDefineMetaCommon<ClassType,DerivedType>::_field<FDao::Application::* >(const char *,FT)' being compiled
          with
          [
              DerivedType=cpgf::GDefineMetaClass<Dao::Application,void,void>
  ,            ClassType=Dao::Application
  ,            F=F_Void
  ,            FT=F_Void Dao::Application::* 
          ]
          Reflection/Reflection.h(457) : see reference to function template instantiation 'cpgf::GDefineMetaField<DerivedType> cpgf::GDefineMetaCommon<ClassType,DerivedType>::_field<FDao::Application::* >(const char *,FT)' being compiled
          with
          [
              DerivedType=cpgf::GDefineMetaClass<Dao::Application,void,void>
  ,            ClassType=Dao::Application
  ,            F=F_Void
  ,            FT=F_Void Dao::Application::* 
          ]
          Application.cpp(858) : see reference to function template instantiation 'Dao::Reflection::Class<Dao::Application,luabind::detail::unspecified> &Dao::Reflection::Class<Dao::Application,luabind::detail::unspecified>::Property<F_Void>(const char *,F Dao::Application::* )' being compiled
          with
          [
              F=F_Void
          ]
          Application.cpp(893) : see reference to function template instantiation 'Dao::Reflection::Class<Dao::Application,luabind::detail::unspecified> &Dao::Reflection::Class<Dao::Application,luabind::detail::unspecified>::Property<F_Void>(const char *,F Dao::Application::* )' being compiled
          with
          [
              F=F_Void
          ]

Dereferencing a null pointer is undefined behavior, and yet it is done twice in gcallback.h. (This advisory came from Clang).

gcallback.h::135

return (T)(*(typename std::conditional<std::is_void<T>::value, int, T>::type *)0);

.../cpgf/build/../include/cpgf/gcallback.h:135:14: warning: binding dereferenced null pointer to reference has undefined behavior
[-Wnull-dereference]

.../cpgf/build/../include/cpgf/gcallback.h:135:14: warning: indirection of non-volatile null pointer will be deleted, not trap
[-Wnull-dereference]

Also, something similar here flags on the IDE.

gcallback.h::144

return *(T *)0;

as titled， if I call functions in multi thread environment, eg find a class by name, create class instance, invoke member function, must I lock the meta class / meta service?
thanks

I used qtjs to animation work,but when i try to generation meta for qquickanimation,there is a error:
In file included from ../../../metagen/build/QtQml/src/meta_qtqml_qquickanimation_p.cpp:33:0:
../../../metagen/build/QtQml/include/meta_qtqml_qquickanimation_p.h:827:29: error: ‘QAbstractAnimationJob* qt_metadata::QQuickColorAnimationWrapper::transition(QQuickStateActions&, QQmlProperties&, QQuickAbstractAnimation::TransitionDirection, QObject_)’ cannot be overloaded
QAbstractAnimationJob * transition(QQuickStateActions & actions, QQmlProperties & modified, TransitionDirection direction, QObject * defaultTarget = 0)
^
../../../metagen/build/QtQml/include/meta_qtqml_qquickanimation_p.h:749:29: error: with ‘QAbstractAnimationJob_ qt_metadata::QQuickColorAnimationWrapper::transition(QQuickStateActions&, QQmlProperties&, QQuickAbstractAnimation::TransitionDirection, QObject*)’
QAbstractAnimationJob * transition(QQuickStateActions & actions, QQmlProperties & modified, QQuickAbstractAnimation::TransitionDirection direction, QObject * defaultTarget = 0)

There is some code in the case statement that handles lua functions in luaToScriptValue which attempts to inspect the upvalue. I'm not sure why it's there or what it is supposed to accomplish, but it seems to break function passing from lua to C++ because luaToScriptValue ends up storing a ref to the upvalue instead of the function (presumably because the upvalue is left on the top of the stack?). I've commented this code out in my copy of cpgf for now and would be happy to submit a patch.

Perhaps this is some debugging code and I should not be using the development branch?

tried building for both xulrunner-27.0.1 and mozjs-24.2.0 - the build fails with errors like:

.../dev/cpgf/test/scriptbind/bind_common.cpp:447:34: error: ‘JSOPTION_METHODJIT’ was not declared in this scope
.../dev/cpgf/test/scriptbind/bind_common.cpp:447:52: error: ‘JS_SetOptions’ was not declared in this scope
.../dev/cpgf/test/scriptbind/bind_common.cpp:448:50: error: ‘JS_SetVersion’ was not declared in this scope
.../dev/cpgf/test/scriptbind/bind_common.cpp: In member function ‘bool testscript::TestScriptContextSpiderMonkey::executeString(const char*, bool) const’:
.../dev/cpgf/test/scriptbind/bind_common.cpp:521:3: error: ‘JSBool’ was not declared in this scope
.../dev/cpgf/test/scriptbind/bind_common.cpp:521:10: error: expected ‘;’ before ‘success’
.../dev/cpgf/test/scriptbind/bind_common.cpp:522:10: error: ‘success’ was not declared in this scope
.../dev/cpgf/test/scriptbind/bind_common.cpp:522:21: error: ‘JS_TRUE’ was not declared in this scope

Hello,

I tried to call a c function that modifies a string that is passed by char*.
Is it possible, to get the result in a python script using that function ?

GDefineMetaGlobal()
._method("mysql_real_escape_string", &mysql_real_escape_string)

MySQL function header is:

unsigned long
mysql_real_escape_string(
              MYSQL *mysql,
              char *to,const char *from,
              unsigned long length);

I'm calling this function with the following python script, but the string passed as to is not changed from the function call.

escapedLoginname = str("")
originalLoginname = str("HelloWorld")
i = mysql_real_escape_string(handle, escapedLoginname, originalLoginname, len(originalLoginname))

I also tried to use the cpgf Byte Array. But I don't know a way to get a python string out of an cpgf Byte Array.