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Home » U++ Library support » U++ Core » Problem with Vector::Add (pick/clone semantics)
Re: Problem with Vector::Add (pick/clone semantics) [message #52218 is a reply to message #52213] Sat, 10 August 2019 06:33 Go to previous messageGo to previous message
Novo is currently offline  Novo
Messages: 1430
Registered: December 2006
Ultimate Contributor
Actually, it is possible to move data from std::initializer_list with a little hack:
template <typename T>
struct Foo {
	Foo(std::initializer_list<T> init) {
		for(const T& i : init)
			v.Add(pick(const_cast<T&>(i)));
	}
//	Foo(std::initializer_list<T> init) {
//		for(const T& i : init)
//			v.Add(i);
//	}
	
	Vector<T> v;
};

struct Boo : Moveable<Boo> {
	Boo() {}
	Boo(const Boo&) = default;
	Boo(Boo&&) = delete;
};

CONSOLE_APP_MAIN
{
	Foo<Vector<int>> f = {{1}};
//	Foo<Boo> f = {Boo()};
}

The problem is that this will require all types to have a move constructor.
A move constructor can be detected via std::is_move_constructible, but I couldn't figure out how to apply SFINAE to a constructor.

IMHO, all this code complexity is unnecessary in this case.


Regards,
Novo
 
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