Why is Visual C++ not performing return-value optimization on the most trivial code?

Question

Does Visual C++ not perform return-value optimization?

#include 
struct Foo { ~Foo() { printf(\"Destructing...\\n\"); } };
Foo foo() { return Foo()         


        

Answer 1

When I test with this:

#include <iostream>
struct Foo { 
    Foo(Foo const &r) { std::cout << "Copying...\n"; }
    ~Foo() { std::cout << "Destructing...\n"; }
    Foo() {}
};

Foo foo() { return Foo(); }

int main() { Foo f = foo(); }

...the output I get is:

Destructing...

No invocation of the copy constructor, and only one of the destructor.