What is the difference between is_convertible is_assignable

Question

What is the difference between is_convertible and is_assignable?

Why,

in vs2012

is_convertible         


        

Answer 1

Seems like a bug in gcc, is_convertible in this context means that:

int& foo()
{
    return 3; //invalid
}

On the other hand is_assignable in this context means that:

void foo(int& x, int y)
{
    y = x; // valid
}