Retrieve return value with lambda from boost::thread

Question

Lately I read this post: How do I use boost.lambda with boost.thread to get the thread's return value?

I tried to implement the answer and it went fairly well except I get an error that I can't solve.

My code is this:

falcon::Mesh* falcon::ResourceManager::GetMesh(const std::string& id)
{
    Mesh* meshPtr;
    boost::thread meshLoadThread(boost::lambda::var(meshPtr) = bind(&MeshManager::LoadMesh, MeshManager::GetInstance(), id));
    meshLoadThread.join();
    return meshPtr;
}

But when I try to compile, I get the following error

error C2440: '=' : cannot convert from 
    'const std::tr1::_Bind<_Result_type,_Ret,_BindN>'
 to 'falcon::Mesh *'

I know it should work normally because in the example it works too! Anyone got any suggestions?

Answer 1

You are using bind from std::tr1 (the version that comes with Visual Studio).

You need to use the version of bind that is part of the Boost.Lambda library, i.e. boost::lambda::bind. Note that this is not the same as boost::bind.

You will need to #include <boost/lambda/bind.hpp>.