C++のコンテナ挙動確認用クラス

MoveOrCopy.cpp

struct Foo;
std::ostream& operator<<(std::ostream& out, const Foo& self);

struct Foo : std::string {
	typedef std::string Base;
	~Foo() {
		std::cout << "dtor : " <<
			std::addressof(*this) <<
			" " << *this << std::endl;
	}

	Foo() : std::string() {
		std::cout << "default cstr : "
			<< std::addressof(*this) <<
			" " << *this << std::endl;
	}

	Foo(const std::string& str) : std::string(str) {
		std::cout << "ctor str : " <<
			std::addressof(*this) <<
			" " << *this << std::endl;
	}

	Foo(const Foo& other) : std::string(other) {
		std::cout << "copy ctor : " <<
			"from " << std::addressof(other) <<
			" to " << std::addressof(*this) <<
			" " << *this << std::endl;
	}

	Foo(Foo&& other) : std::string(std::move(other)) {
		std::cout << "move ctor : " <<
			"from " << std::addressof(other) <<
			" to " << std::addressof(*this) <<
			" " << *this << std::endl;
	}

	auto operator=(const Foo& other) -> Foo& {
		std::string::operator=(other);
		std::cout << "copy : " << 
			"from " << std::addressof(other) <<
			" to " << std::addressof(*this) <<
			" " << *this << std::endl;
		return *this;
	}
	
	auto operator=(Foo&& other) -> Foo& {
		std::string::operator=(std::move(other));
		std::cout << "copy : " << 
			"from " << std::addressof(other) <<
			" to " << std::addressof(*this) <<
			" " << *this << std::endl;
		return *this;
	}
};

std::ostream& operator<<(std::ostream& out, const Foo& self) {
	return out << self.c_str();
}