C++11 lambda as member variable?

Question

Can lambda\'s be defined as class members?

For example, would it be possible to rewrite the code sample below using a lambda instead of a function object?

Answer 1

A bit late, but I have not seen this answer anywhere here. If the lambda has no capture arguments, then it can be implicitly cast to a pointer to a function with the same arguments and return types.

For example, the following program compiles fine and does what you would expect:

struct a {
    int (*func)(int, int);
};

int main()
{
    a var;
    var.func = [](int a, int b) { return a+b; };
}

Of course, one of the main advantages of lambdas is the capture clause, and once you add that, then that trick will simply not work. Use std::function or a template, as answered above.