(Mac)
我尝试过命名空间,包括警卫、编译指示一次等。
基本上,这是结构:
CMakeLists.txt
add_executable(Game Game/main.cpp Game/rtexture.cpp)
游戏/main.cpp
#include "cleanup.h"
//...
cleanup(foobar);
游戏/rtexture.cpp
#include "cleanup.h"
//...
cleanup(foobar);
清理.h
//various includes
template<typename T, typename... Args>
void cleanup(T *t, Args&&... args){
//Cleanup the first item in the list
cleanup(t);
//Recurse to clean up the remaining arguments
cleanup(std::forward<Args>(args)...);
}
/*
* These specializations serve to free the passed argument and also provide the
* base cases for the recursive call above, eg. when args is only a single item
* one of the specializations below will be called by
* Cleanup(std::forward<Args>(args)...), ending the recursion
* We also make it safe to pass nullptrs to handle situations where we
* don't want to bother finding out which values failed to load (and thus are null)
* but rather just want to clean everything up and let cleanup sort it out
*/
template<>
void cleanup<SDL_Window>(SDL_Window *win){
if (!win){
return;
}
SDL_DestroyWindow(win);
}
template<>
void cleanup<SDL_Renderer>(SDL_Renderer *ren){
if (!ren){
return;
}
SDL_DestroyRenderer(ren);
}
template<>
void cleanup<SDL_Texture>(SDL_Texture *tex){
if (!tex){
return;
}
SDL_DestroyTexture(tex);
}
template<>
void cleanup<SDL_Surface>(SDL_Surface *surf){
if (!surf){
return;
}
SDL_FreeSurface(surf);
}
如果有人问,我确实从教程中获取了这个“cleanup.h”,但找不到一种方法将其包含在多个类中而不声明重复的符号。
Home at cruz45488-y19-MBA13-12 in ~/desktop/sdlworkspace/tmp
$ make
Linking CXX executable Game
duplicate symbol __ZN5RUtil7cleanupI10SDL_WindowJEEEvPT_DpOT0_ in:
CMakeFiles/Game.dir/Game/main.cpp.o
CMakeFiles/Game.dir/Game/rtexture.cpp.o
duplicate symbol __ZN5RUtil7cleanupI12SDL_RendererJEEEvPT_DpOT0_ in:
CMakeFiles/Game.dir/Game/main.cpp.o
CMakeFiles/Game.dir/Game/rtexture.cpp.o
duplicate symbol __ZN5RUtil7cleanupI11SDL_TextureJEEEvPT_DpOT0_ in:
CMakeFiles/Game.dir/Game/main.cpp.o
CMakeFiles/Game.dir/Game/rtexture.cpp.o
duplicate symbol __ZN5RUtil7cleanupI11SDL_SurfaceJEEEvPT_DpOT0_ in:
CMakeFiles/Game.dir/Game/main.cpp.o
CMakeFiles/Game.dir/Game/rtexture.cpp.o
有什么帮助吗?谢谢。
与常规函数一样,显式函数模板特化也遵循“单一定义规则”。添加inline
允许在标头中进行定义;或者在源文件中定义它们,并在标头中声明。
本文内容由网友自发贡献,版权归原作者所有,本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容,请联系:hwhale#tublm.com(使用前将#替换为@)