coasync4cpp allows to write async code without callbacks using async/await/task! For C++11!

This library let you use the async/await pattern, known from c#, for your c++ or qt projects. You can define any method as 'async' and than make use of the await or Task<> keywords of the library.

Lets see in an simple example, what the library can do for you. In this QT-based example, we make use of QFuture and QFutureWatcher to await the result of an operation within the thread pool:

 // Instantiate the objects and connect to the finished signal.
 MyClass myObject;
 QFutureWatcher<int> watcher;
 connect(&watcher, SIGNAL(finished()), &myObject, SLOT(handleFinished()));
 
 // Start the computation.
 QFuture<int> future = QtConcurrent::run(...);
 watcher.setFuture(future);

this can now be replaced by a single line of code:

 int result = await QtConcurrent::run(...);

You save an complete callback, you have not longer to manage the QFuture/QFutureWatcher things. You simply write your code from top to bottom. As it is with synchronous code.

QtConcurrent::run returns here an QFuture. This is called an Awaitable.

An operation, that is already running and promises to you to deliver an result in the future is called an 'Awaitable'.

coasync4cpp currently supports a bunch of Awaitables:

• boost::future
• QFuture
• Task<>

We can await an Awaitbale using the Task<> object or await keyword. But, these awaits are only allowed within an asyncronous execution context. To create such an context, we use Task Factories.

coasync4cpp issues

If you spot a bug or want to brainstorm a potential new feature, then please raise an issue in our main GitHub project (helgebetzinger/coasync4cpp); likewise if you have developed a cool new feature or improvement in your coasync4cpp fork, then send us a pull request!

For the wiki and readme.me, we use markdown syntax. We have good experiences using this online editor.

• Documentation within the coasync4cpp repository
• Library documentation of coasync4cpp
• Presentation on the Qt Developer Days Europe 2014

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