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

Your problem is in the instantiation. You don't need Foo d = Foo(); for a default constructor.

Keep your class the same, but try this for instantiation:

Foo d;

In fact, you don't even need Foo d = Foo(arguments); for constructing with parameters. That should be like this:

Foo d(arguments);