NonCopyable class member?

[Millsialix]

Hi,
Everything is in the title, I want to create a vector with some classes with NonCopyable members (sf::Shader, but the error is the same with other classes), and my compiler says that I use a deleted function, and I'm almost sure that is because my class member is a NonCopyable:

#include <SFML/Graphics.hpp>

class Object {

        public:
                Object(){};

        protected:
                sf::Shader m_shader;
};

int main(){
    std::vector<Object> tmp( 27, Object());
}
 

Error:

Code: [Select]

G:\...\MinGW-5.1.0\...\stl_construct.h|75|error: use of deleted function 'Object::Object(const Object&)'|
G:\...\main.cpp|3|note: 'Object::Object(const Object&)' is implicitly deleted because the default definition would be ill-formed:|
G:\...\SFML-2.5.0\...\NonCopyable.hpp|77|error: 'sf::NonCopyable::NonCopyable(const sf::NonCopyable&)' is private|

I don't really want to use pointers or std::shared_ptr to use SFML things, so here is my question: Am I doing something wrong, or is it just the way SFML works?

[eXpl0it3r]

A std::vector requires your class to be copyable and since you didn't restrict the constructor generation, your Object class gets a default copy-constructor, except the Object class can't be copied, because it holds non-copyable resources.

Probably better to manage your resources externally, with something like a resource holder and pass a reference around.

[Nexus]

Since C++11, std::vector only requires copyable elements for some operations (such as copying/assigning the vector). Otherwise, it supports movable elements -- however SFML classes are not move-enabled (since they're written in C++03, and when explicitly specifying other constructors, no move constructor/assignment operator is generated).

If you're interested, one possible solution is my Thor library which manages resources for you. You load resources such as sf::Shader in one central place, and distribute shared pointers to them. Here is the link to the tutorial.