C++11 std::async in Android NDK does not work

Question

I have tried to get following sample code working to know whether asynchronous programming is working in Android NDK. Though NDK has the STL `` which gets recognized as a header, the `std::async` is not getting recognized are not getting recognized. The code I tried to use was the following: ``` #include #include struct Foo { Foo() : data(0) {} void sum(int i) { data +=i;} int data; }; int main() { Foo foo; auto f = std::async(&Foo::sum, &foo, 42); f.get(); std::cout << foo.data << " "; } ``` Also all the include paths have been set to the specified folder under Properties->Paths and Symbols ``` Errors Description Resource Path Location Type invalid use of incomplete type 'std::__async_sfinae_helper::type {aka struct std::future}' Sample.cpp /Project12/jni line 50 C/C++ Problem Description Resource Path Location Type declaration of 'std::__async_sfinae_helper

Accepted Answer

Curently Android NDK does not incorporate all of the C++11 features. Clang 3.3 compiler from NDK r9b is C++11-feature complete, however, `STL` and `stdlib` on Android are not.

To use the most recent `C++11` feature set in Android use Clang 3.3 compiler from `Android NDK r9b`. Put this line into your `Application.mk` file:

```
NDK_TOOLCHAIN_VERSION := clang
```

Also, add `-std=c++11` switch to the `LOCAL_CPPFLAGS` variable:

```
LOCAL_CPPFLAGS += -std=c++11
```

C++11 std::async in Android NDK does not work

Solution

Problem