来自 sfml 示例的重构 pong 中的棘手错误
Tricky bugs in refacored pong from sfml examples
我正在通过乒乓球示例学习 SFML。
可以找到原始代码there。我试图将这些行放在一个函数中,然后进行调用:
sf::RenderWindow window(
sf::VideoMode( gameWidth, gameHeight, 32 ),
"SFML Pong",
sf::Style::Titlebar | sf::Style::Close
);
window.setVerticalSyncEnabled( true );
sf::RenderWindow
CreateWindow( int width, int height, int color_depth, std::string title ){
sf::RenderWindow window( sf::VideoMode( width, height, color_depth ), title );
window.setVerticalSyncEnabled( true );
return window;
}
//....
sf::RenderWindow window = CreateWindow( gameWidth, gameHeight, 32, "My SFML pong" );
并得到一大堆不明显的 errors。我做错了什么?
第一个错误告诉你你需要知道的一切:
In file included from /usr/include/SFML/System/Lock.hpp:32:0,
from /usr/include/SFML/System.hpp:36,
from /usr/include/SFML/Window.hpp:32,
from /usr/include/SFML/Graphics.hpp:32,
from main.cpp:5:
/usr/include/SFML/System/NonCopyable.hpp: In copy constructor ‘sf::Window::Window(const sf::Window&)’:
/usr/include/SFML/System/NonCopyable.hpp:67:5: error: ‘sf::NonCopyable::NonCopyable(const sf::NonCopyable&)’ is private NonCopyable(const NonCopyable&);
A Window
通过继承是 NonCopyable
。因此你不能从一个函数中 return 它。
一个解决方案是将 window 引用作为函数的输入:
void CreateWindow( sf::RenderWindow& window, int width, int height, int color_depth, std::string title )
我正在通过乒乓球示例学习 SFML。
可以找到原始代码there。我试图将这些行放在一个函数中,然后进行调用:
sf::RenderWindow window(
sf::VideoMode( gameWidth, gameHeight, 32 ),
"SFML Pong",
sf::Style::Titlebar | sf::Style::Close
);
window.setVerticalSyncEnabled( true );
sf::RenderWindow
CreateWindow( int width, int height, int color_depth, std::string title ){
sf::RenderWindow window( sf::VideoMode( width, height, color_depth ), title );
window.setVerticalSyncEnabled( true );
return window;
}
//....
sf::RenderWindow window = CreateWindow( gameWidth, gameHeight, 32, "My SFML pong" );
并得到一大堆不明显的 errors。我做错了什么?
第一个错误告诉你你需要知道的一切:
In file included from /usr/include/SFML/System/Lock.hpp:32:0, from /usr/include/SFML/System.hpp:36, from /usr/include/SFML/Window.hpp:32, from /usr/include/SFML/Graphics.hpp:32, from main.cpp:5: /usr/include/SFML/System/NonCopyable.hpp: In copy constructor ‘sf::Window::Window(const sf::Window&)’: /usr/include/SFML/System/NonCopyable.hpp:67:5: error: ‘sf::NonCopyable::NonCopyable(const sf::NonCopyable&)’ is private NonCopyable(const NonCopyable&);
A Window
通过继承是 NonCopyable
。因此你不能从一个函数中 return 它。
一个解决方案是将 window 引用作为函数的输入:
void CreateWindow( sf::RenderWindow& window, int width, int height, int color_depth, std::string title )