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

You can cure the problem in either of two ways. One (already suggested by Randolpho) is to eliminate using the copy ctor. The other is to write a proper copy ctor:

Foo (Foo const &) {}

You generally want to do both.

Edit: Looking at it, my last comment is easy to mis-construe. Quite a few classes do not need a copy ctor at all, but if you do need a copy ctor, it should normally have the form above (not explicit, and taking a const reference as the parameter).