akrzemi1 / explicit Goto Github PK
View Code? Open in Web Editor NEWA set of small tools that allow you to state your intentions mre explicitly in the code
License: Boost Software License 1.0
A set of small tools that allow you to state your intentions mre explicitly in the code
License: Boost Software License 1.0
Hi,
I'd like to be able to refactor existing code to add out_param
semantics, preferably only modifying the signatures and call-sites, having out_param<T>
behaving as original plain reference. Can this be accomplished by deriving from T?
e.g.
template<typename T>
struct out_param : public T
{
using T::operator=;
out_param() = delete;
out_param& operator=(const out_param&) = delete;
out_param& operator=(out_param&&) = delete;
out_param(const out_param&) = delete;
out_param(out_param&&) = delete;
};
template<typename T>
out_param<T>& out(T& t)
{
static_assert(sizeof(T) == sizeof(out_param<T>)
&& alignof(T) == alignof(out_param<T>), "");
assert(&static_cast<out_param<T>&>(t) == &t);
return static_cast<out_param<T>&>(t); // is this UB?
}
///////////////////////////////////////////////////////
static void foo(out_param<string>& s)
{
// use s as plain string&
}
static void bar()
{
string s = "bar";
const string const_s = "bar";
#if 0
// should not compile
foo(s);
foo(const_s);
foo(out(const_s));
foo(out(std::move(s));
foo("");
#endif
foo(out(s));
}
Thanks!
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