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

Foo d = Foo();

should be

Foo d;

The first line creates a Foo instance and then copies it to d;