SFML在通过类初始化窗口时出现NonCopyable错误

Question

我正在制作一个Game类，它有一个用来制作窗口的函数。当我试图执行这个函数时，VS2012给出了这个错误：

Error   1   error C2248: 'sf::NonCopyable::operator =' : cannot access private member declared in class 'sf::NonCopyable'   C:\SFML-2.0-rc\include\SFML\Window\Window.hpp   476 1   Faceman

这是我的Game.h (未完成)：

#ifndef FP_MENU
#define FP_MENU

#include <SFML/Graphics.hpp>

class GAME {
    public:

        sf::RenderWindow GameWindow;

        void createWindow();
            unsigned int getWindowWidth();
            unsigned int getWindowHeight();

            void setWindowWidth(unsigned int w);
            void setWindowHeight(unsigned int h);

        void loadMMenu();

        void startGame( bool isTurboMode );
            void pause();

        void options();
            void changeWindowSize( unsigned int x, unsigned int y );
            void changeVolume( int i );

        void Quit();

    private:
        unsigned int WINDOW_WIDTH;
        unsigned int WINDOW_HEIGHT;
};

static GAME Game;

#endif

Game.cpp (未完成，但具有测试所需的所有功能)：

#include "Game.h"

void GAME::setWindowWidth(unsigned int w) {

    w = WINDOW_WIDTH;
}

void GAME::setWindowHeight(unsigned int h) {

    h = WINDOW_HEIGHT;
}

unsigned int GAME::getWindowHeight() {

    return WINDOW_HEIGHT;
}

unsigned int GAME::getWindowWidth() {

    return WINDOW_WIDTH;
}

void GAME::createWindow() {

    if(getWindowHeight() != 0 && getWindowWidth() != 0)
    {
        GameWindow = sf::RenderWindow(sf::VideoMode( getWindowWidth(), getWindowHeight() ), "Title Goes Here");
        GameWindow.setPosition(sf::Vector2i(50, 50));
    }

    else 
    {
        setWindowWidth(1024);
        setWindowHeight(768);
        GameWindow = sf::RenderWindow(sf::VideoMode( getWindowWidth(), getWindowHeight() ), "Title Goes Here");
        GameWindow.setPosition(sf::Vector2i(50, 50));
    }
}

Main.cpp：

#include <SFML/Graphics.hpp>
#include "Game.h"

int main()
{
    Game.createWindow(Game.getWindowWidth(), Game.getWindowHeight());

    while (Game.GameWindow.isOpen())
    {
        sf::Event event;
        while (Game.GameWindow.pollEvent(event))
        {
            if (event.type == sf::Event::Closed)
                Game.GameWindow.close();
        }

        Game.GameWindow.clear();
        Game.GameWindow.display();
    }

    return 0;
}

Answer 1

这是一个复制操作，即使您可能打算将其初始化：

GameWindow = sf::RenderWindow(sf::VideoMode( getWindowWidth(), getWindowHeight() ), "Title Goes Here");

而且(如果这一点不明显) sf::RenderWindow是不可复制的。

您可以通过GAME类的构造函数中的构造函数初始化RenderWindow，也可以将其设置为动态对象：

std::unique_ptr<sf::RenderWindow> GameWindow; //you are using VS2012 so C++11 smart pointers are the best way to do this

//...skipped some code
GameWindow = std::unique_ptr<sf::RenderWindow>(new sf::RenderWindow(sf::VideoMode( getWindowWidth(), getWindowHeight() ), "Title Goes Here"));

然后通过GameWindow->而不是GameWindow.使用它。

Answer 2

下面的竞赛中的"uninitialized local variable 'event‘vs 2013“怎么样？

while (window.isOpen()){
            sf::Event event;
            while (event.type)
            {
                if (event.type == sf::Event::Closed)
                    window.close();
                //case haddle all other case
                switch (event.type)