How can I make the storage of C++ lambda objects more efficient?

Question

I\'ve been thinking about storing C++ lambda\'s lately. The standard advice you see on the Internet is to store the lambda in a std::function object. However, none of this adv

Answer 1

Using C++14, you can avoid the copies altogether:

int main()
{
    Simple test( 5 );

    std::function f =
    [test = std::move(test)] ()
    {
        return test.Get();
    };

    printf( "%d\n", f() );
}

To produce the output:

Constructing simple!
Moving simple!
Moving simple!
Destroying simple!
5
Destroying simple!
Destroying simple!

Note the following line:

[test = std::move(test)] 

Here, the first appearance of "test" is in a different scope than the second.