Foo f = Foo(); // no matching function for call to 'Foo::Foo(Foo)' … huh?

Question

class Foo
{
public:
    explicit Foo() {}
    explicit Foo(Foo&) {}
};

Foo d = Foo();

error: no matching function for call to \

Answer 1

Try without the explicit? I think that:

Foo foo = Foo()

creates an implicit copy, thus the explicit copy constructor doesn't get triggered.

Edit:

This is only half the answer. See Charles Bailey or UncleBens post for why const is necessary.