C++ 键盘事件C+的数据结构+；

作为我正在观看的教程的一部分，我正在研究一个输入系统。在谷歌搜索中，我发现只有一种方法可以通过应用程序循环中的switch语句在线处理输入

我找不到本教程真正采用shift、alt和ctrl等mod键的示例。我发现我可以适当地拉动当前的mods，但我找不到一个方便的方法来实现我想做的事情

我的计划是拥有一个作为应用程序类一部分的输入类。输入可以传递到窗口和游戏对象，这样我就有了一个用于整个程序的单一输入状态系统。我想根据需要在游戏或窗口中注册回调函数，我知道的唯一方法是通过

。我想我可能会有一种

std:：map

的情况。但是，由于我需要考虑键的修改，是否有一种方法可以生成扫描码和修改码组合的唯一键值，例如

a

、

shift+a

和

ctrl+a

我认为现在我的解决方案有点被破解了，因为我需要为每个修改器组合设置一个唯一的

std:：map

当前注册（减去将key/func对插入到映射中的实现），但对于下面的每个

if

块，我基本上需要一个单独的映射。有没有更好的管理方法

void Register(SDL_KeyboardEvent key, std::function<void()> func ) {

    if( !( key.keysym.sym == SDLK_LSHIFT || key.keysym.sym == SDLK_RSHIFT || key.keysym.sym == SDLK_LCTRL || key.keysym.sym == SDLK_RCTRL || key.keysym.sym == SDLK_LALT || key.keysym.sym == SDLK_RALT )) {

        if( (( key.keysym.mod & ( KMOD_LSHIFT | KMOD_RSHIFT )) > 0 ) && (( key.keysym.mod & ( KMOD_LCTRL | KMOD_RCTRL )) > 0 ) && (( key.keysym.mod & ( KMOD_LALT | KMOD_RALT ))  > 0  )) {
            std::cout << "Ctrl + Alt + Shift + " << key.keysym.sym  << std::endl;
        }
        else if ( (( key.keysym.mod & ( KMOD_LSHIFT |  KMOD_RSHIFT )) > 0 ) && (( key.keysym.mod & ( KMOD_LCTRL | KMOD_RCTRL )) > 0 )) {
            std::cout << "Shift + Ctrl + " << key.keysym.sym << std::endl;
        }
        else if ( (( key.keysym.mod & ( KMOD_LSHIFT |  KMOD_RSHIFT )) > 0 ) && (( key.keysym.mod & ( KMOD_LALT | KMOD_RALT ))  > 0 )) {
            std::cout << "Shift + Alt + " << key.keysym.sym << std::endl;
        }
        else if ( (( key.keysym.mod & ( KMOD_LCTRL | KMOD_RCTRL )) > 0 ) && (( key.keysym.mod & ( KMOD_LALT | KMOD_RALT ))  > 0 )) {
            std::cout << "Ctrl + Alt + " << key.keysym.sym << std::endl;
        }
        else if (( key.keysym.mod & ( KMOD_LSHIFT |  KMOD_RSHIFT )) > 0 ) {
            std::cout << "Shift + " << key.keysym.sym << std::endl;
        }
        else if (( key.keysym.mod & ( KMOD_LALT | KMOD_RALT )) > 0 ) {
            std::cout << "Alt + " << key.keysym.sym << std::endl;
        }
        else if (( key.keysym.mod & ( KMOD_LCTRL | KMOD_RCTRL )) > 0 ) {
            std::cout << "Ctrl + " << key.keysym.sym << std::endl;
        }
        else {
            std::cout << "Unmodded " << key.keysym.sym << " MODS: " << key.keysym.mod << std::endl;
        }

    }
}

无效寄存器（SDL_键盘事件键，std:：func函数）{ 如果（！（key.keysym.sym==SDLK|LSHIFT | key.keysym.sym==SDLK|RSHIFT | key.keysym.sym==SDLK|LCTRL | key.keysym.sym==SDLK|RCTRL | key.key.keysym.sym==SDLK LALT | key.key.keysym{ 如果（（key.keysym.mod和（KMOD|LSHIFT | KMOD|RSHIFT））>0）和（（key.keysym.mod和（KMOD|LCTRL | KMOD|RCTRL））>0）和（（key.keysym.mod和（KMOD|LALT | KMOD|RALT））>0））{ std：：cout with 1> [ 1> _Fty=无效（无效）， 1> _Kty=键， 1> _Ty=std:：function 1> ] 1> c:\ProgramFiles（x86）\microsoft visual studio 11.0\vc\include\map（190）：或“std:：function&std:：map:：operator[]（常量键和） 1> 与 1> [ 1> _Fty=无效（无效）， 1> _Kty=键， 1> _Ty=std:：function 1> ] 1> 尝试匹配参数列表时“（std:：map，Input:：key）” 1> 与 1> [ 1> _Kty=键， 1> _Ty=std:：function 1> ] 1> 正在生成代码。。。 1> 编译。。。 1> Game.cpp 1> c:\ProgramFiles（x86）\microsoft visual studio 11.0\vc\include\utility（201）：错误C2079:“std:：pair:：first”使用未定义的结构“key” 1> 与 1> [ 1> _Ty1=常数键， 1> _Ty2=std:：function 1> ] 1> c:\ProgramFiles（x86）\microsoft visual studio 11.0\vc\include\xtree（498）：请参阅正在编译的类模板实例化“std:：pair”的参考 1> 与 1> [ 1> _Ty1=常数键， 1> _Ty2=std:：function 1> ] 1> c:\program files（x86）\microsoft visual studio 11.0\vc\include\xtree（593）：请参阅正在编译的类模板实例化“std:：\u Tree\u node”的参考 1> 与 1> [ 1> \u值\u类型=标准：：对， 1> _Voidptr=无效* 1> ] 1> c:\ProgramFiles（x86）\microsoft visual studio 11.0\vc\include\xtree（592）：编译类模板成员函数“std:：_Tree\u node*&std:_Tree\u val:：_Left（std:_Tree\u node*）” 1> 与 1> [ 1> \u值\u类型=标准：：对， 1> _Voidptr=void*， 1> _Val_types=std:：_Tree_simple_类型 1> ] 1> c:\ProgramFiles（x86）\microsoft visual studio 11.0\vc\include\xtree（864）：请参阅正在编译的函数模板实例化“std:：_Tree\u node*&std:_Tree\u val:_Left（std:_Tree\u node*）”的参考 1> 与 1> [ 1> \u值\u类型=标准：：对， 1> _Voidptr=void*， 1> _Val_types=std:：_Tree_simple_类型 1> ] 1> c:\ProgramFiles（x86）\microsoft visual studio 11.0\vc\include\xtree（766）：请参阅正在编译的类模板实例化“std:：\u Tree\u val”的参考 1> 与 1> [ 1> _Val_types=std:：_Tree_simple_类型 1> ] 1> c:\ProgramFiles（x86）\microsoft visual studio 11.0\vc\include\xtree（884）：请参阅正在编译的类模板实例化“std:：_Tree\u alloc”的参考 1> 与 1> [ 1> _Al_has_storage=false， 1> _Alloc_types=std:：_Tree_base_types 1> ] 1> c:\ProgramFiles（x86）\microsoft visual studio 11.0\vc\include\xtree（996）：请参阅正在编译的类模板实例化“std:：\u Tree\u buy”的参考 1> 与 1> [ 1> _Ty=std:：pair， 1> _Alloc=std:：分配器 1> ] 1> c:\ProgramFiles（x86）\microsoft visual studio 11.0\vc\include\xtree（1029）：请参阅正在编译的类模板实例化“std:：_Tree\u comp”的参考 1> 与 1> [ 1> _Pr_has_storage=false， 1> _Traits=std:_Tmap_Traits 1> ] 1> c:\ProgramFiles（x86）\microsoft visual studio 11.0\vc\include\map（67）：请参阅正在编译的类模板实例化“std:：\u Tree”的参考 1> 与 1> [ 1> _Traits=std:_Tmap_Traits 1> ] 1> c:\users\frizzlefry\documents\visualstudio 2012\projects\3d game tut\3d game tut\input.h（21）：请参阅正在编译的类模板实例化“std:：map”的参考 1> 与 1> [ 1> _Kty=键， 1> _Ty=std:：function 1> ] 1> 正在生成代码。。。 1> 编译。。。 1> KApp.cpp 1> c:\ProgramFiles（x86）\microsoft visual studio 11.0\vc\include\utility（201）：错误C2079:'std:：pair:：fi

std::map<key,std::function<void()>> Callbacks;

struct key {
    SDL_Scancode code;
    Uint16       kmod;

    bool operator<( const key & okey) const {
        return std::tie( code,kmod ) < std::tie( okey.code,okey.kmod );
    }
};

void Input::RegCallBack(SDL_Scancode k, Uint16 kmod, std::function<void()> func) {
key tkey; 
tkey.code = k;
tkey.kmod = kmod;

Callbacks[tkey] = func;  //Does not like this.

return;
}

1>------ Build started: Project: 3D Game Tut, Configuration: Debug Win32 ------
1>Build started 7/22/2015 3:31:55 PM.
1>InitializeBuildStatus:
1>  Creating "Debug\3D Game Tut.unsuccessfulbuild" because "AlwaysCreate" was specified.
1>ClCompile:
1>  Input.cpp
1>c:\users\frizzlefry\documents\visual studio 2012\projects\3d game tut\3d game tut\input.cpp(65): error C2679: binary '[' : no operator found which takes a right-hand operand of type 'Input::key' (or there is no acceptable conversion)
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\map(173): could be 'std::function<_Fty> &std::map<_Kty,_Ty>::operator [](key &&)'
1>          with
1>          [
1>              _Fty=void (void),
1>              _Kty=key,
1>              _Ty=std::function<void (void)>
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\map(190): or       'std::function<_Fty> &std::map<_Kty,_Ty>::operator [](const key &)'
1>          with
1>          [
1>              _Fty=void (void),
1>              _Kty=key,
1>              _Ty=std::function<void (void)>
1>          ]
1>          while trying to match the argument list '(std::map<_Kty,_Ty>, Input::key)'
1>          with
1>          [
1>              _Kty=key,
1>              _Ty=std::function<void (void)>
1>          ]
1>  Generating Code...
1>  Compiling...
1>  Game.cpp
1>c:\program files (x86)\microsoft visual studio 11.0\vc\include\utility(201): error C2079: 'std::pair<_Ty1,_Ty2>::first' uses undefined struct 'key'
1>          with
1>          [
1>              _Ty1=const key,
1>              _Ty2=std::function<void (void)>
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(498) : see reference to class template instantiation 'std::pair<_Ty1,_Ty2>' being compiled
1>          with
1>          [
1>              _Ty1=const key,
1>              _Ty2=std::function<void (void)>
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(593) : see reference to class template instantiation 'std::_Tree_node<_Value_type,_Voidptr>' being compiled
1>          with
1>          [
1>              _Value_type=std::pair<const key,std::function<void (void)>>,
1>              _Voidptr=void *
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(592) : while compiling class template member function 'std::_Tree_node<_Value_type,_Voidptr> *&std::_Tree_val<_Val_types>::_Left(std::_Tree_node<_Value_type,_Voidptr> *)'
1>          with
1>          [
1>              _Value_type=std::pair<const key,std::function<void (void)>>,
1>              _Voidptr=void *,
1>              _Val_types=std::_Tree_simple_types<std::pair<const key,std::function<void (void)>>>
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(864) : see reference to function template instantiation 'std::_Tree_node<_Value_type,_Voidptr> *&std::_Tree_val<_Val_types>::_Left(std::_Tree_node<_Value_type,_Voidptr> *)' being compiled
1>          with
1>          [
1>              _Value_type=std::pair<const key,std::function<void (void)>>,
1>              _Voidptr=void *,
1>              _Val_types=std::_Tree_simple_types<std::pair<const key,std::function<void (void)>>>
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(766) : see reference to class template instantiation 'std::_Tree_val<_Val_types>' being compiled
1>          with
1>          [
1>              _Val_types=std::_Tree_simple_types<std::pair<const key,std::function<void (void)>>>
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(884) : see reference to class template instantiation 'std::_Tree_alloc<_Al_has_storage,_Alloc_types>' being compiled
1>          with
1>          [
1>              _Al_has_storage=false,
1>              _Alloc_types=std::_Tree_base_types<std::pair<const key,std::function<void (void)>>,std::allocator<std::pair<const key,std::function<void (void)>>>>
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(996) : see reference to class template instantiation 'std::_Tree_buy<_Ty,_Alloc>' being compiled
1>          with
1>          [
1>              _Ty=std::pair<const key,std::function<void (void)>>,
1>              _Alloc=std::allocator<std::pair<const key,std::function<void (void)>>>
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(1029) : see reference to class template instantiation 'std::_Tree_comp<_Pr_has_storage,_Traits>' being compiled
1>          with
1>          [
1>              _Pr_has_storage=false,
1>              _Traits=std::_Tmap_traits<key,std::function<void (void)>,std::less<key>,std::allocator<std::pair<const key,std::function<void (void)>>>,false>
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\map(67) : see reference to class template instantiation 'std::_Tree<_Traits>' being compiled
1>          with
1>          [
1>              _Traits=std::_Tmap_traits<key,std::function<void (void)>,std::less<key>,std::allocator<std::pair<const key,std::function<void (void)>>>,false>
1>          ]
1>          c:\users\frizzlefry\documents\visual studio 2012\projects\3d game tut\3d game tut\input.h(21) : see reference to class template instantiation 'std::map<_Kty,_Ty>' being compiled
1>          with
1>          [
1>              _Kty=key,
1>              _Ty=std::function<void (void)>
1>          ]
1>  Generating Code...
1>  Compiling...
1>  KApp.cpp
1>c:\program files (x86)\microsoft visual studio 11.0\vc\include\utility(201): error C2079: 'std::pair<_Ty1,_Ty2>::first' uses undefined struct 'key'
1>          with
1>          [
1>              _Ty1=const key,
1>              _Ty2=std::function<void (void)>
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(498) : see reference to class template instantiation 'std::pair<_Ty1,_Ty2>' being compiled
1>          with
1>          [
1>              _Ty1=const key,
1>              _Ty2=std::function<void (void)>
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(593) : see reference to class template instantiation 'std::_Tree_node<_Value_type,_Voidptr>' being compiled
1>          with
1>          [
1>              _Value_type=std::pair<const key,std::function<void (void)>>,
1>              _Voidptr=void *
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(592) : while compiling class template member function 'std::_Tree_node<_Value_type,_Voidptr> *&std::_Tree_val<_Val_types>::_Left(std::_Tree_node<_Value_type,_Voidptr> *)'
1>          with
1>          [
1>              _Value_type=std::pair<const key,std::function<void (void)>>,
1>              _Voidptr=void *,
1>              _Val_types=std::_Tree_simple_types<std::pair<const key,std::function<void (void)>>>
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(864) : see reference to function template instantiation 'std::_Tree_node<_Value_type,_Voidptr> *&std::_Tree_val<_Val_types>::_Left(std::_Tree_node<_Value_type,_Voidptr> *)' being compiled
1>          with
1>          [
1>              _Value_type=std::pair<const key,std::function<void (void)>>,
1>              _Voidptr=void *,
1>              _Val_types=std::_Tree_simple_types<std::pair<const key,std::function<void (void)>>>
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(766) : see reference to class template instantiation 'std::_Tree_val<_Val_types>' being compiled
1>          with
1>          [
1>              _Val_types=std::_Tree_simple_types<std::pair<const key,std::function<void (void)>>>
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(884) : see reference to class template instantiation 'std::_Tree_alloc<_Al_has_storage,_Alloc_types>' being compiled
1>          with
1>          [
1>              _Al_has_storage=false,
1>              _Alloc_types=std::_Tree_base_types<std::pair<const key,std::function<void (void)>>,std::allocator<std::pair<const key,std::function<void (void)>>>>
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(996) : see reference to class template instantiation 'std::_Tree_buy<_Ty,_Alloc>' being compiled
1>          with
1>          [
1>              _Ty=std::pair<const key,std::function<void (void)>>,
1>              _Alloc=std::allocator<std::pair<const key,std::function<void (void)>>>
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(1029) : see reference to class template instantiation 'std::_Tree_comp<_Pr_has_storage,_Traits>' being compiled
1>          with
1>          [
1>              _Pr_has_storage=false,
1>              _Traits=std::_Tmap_traits<key,std::function<void (void)>,std::less<key>,std::allocator<std::pair<const key,std::function<void (void)>>>,false>
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\map(67) : see reference to class template instantiation 'std::_Tree<_Traits>' being compiled
1>          with
1>          [
1>              _Traits=std::_Tmap_traits<key,std::function<void (void)>,std::less<key>,std::allocator<std::pair<const key,std::function<void (void)>>>,false>
1>          ]
1>          c:\users\frizzlefry\documents\visual studio 2012\projects\3d game tut\3d game tut\input.h(21) : see reference to class template instantiation 'std::map<_Kty,_Ty>' being compiled
1>          with
1>          [
1>              _Kty=key,
1>              _Ty=std::function<void (void)>
1>          ]
1>  Generating Code...
1>  Compiling...
1>  Source.cpp
1>c:\program files (x86)\microsoft visual studio 11.0\vc\include\utility(201): error C2079: 'std::pair<_Ty1,_Ty2>::first' uses undefined struct 'key'
1>          with
1>          [
1>              _Ty1=const key,
1>              _Ty2=std::function<void (void)>
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(498) : see reference to class template instantiation 'std::pair<_Ty1,_Ty2>' being compiled
1>          with
1>          [
1>              _Ty1=const key,
1>              _Ty2=std::function<void (void)>
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(593) : see reference to class template instantiation 'std::_Tree_node<_Value_type,_Voidptr>' being compiled
1>          with
1>          [
1>              _Value_type=std::pair<const key,std::function<void (void)>>,
1>              _Voidptr=void *
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(592) : while compiling class template member function 'std::_Tree_node<_Value_type,_Voidptr> *&std::_Tree_val<_Val_types>::_Left(std::_Tree_node<_Value_type,_Voidptr> *)'
1>          with
1>          [
1>              _Value_type=std::pair<const key,std::function<void (void)>>,
1>              _Voidptr=void *,
1>              _Val_types=std::_Tree_simple_types<std::pair<const key,std::function<void (void)>>>
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(864) : see reference to function template instantiation 'std::_Tree_node<_Value_type,_Voidptr> *&std::_Tree_val<_Val_types>::_Left(std::_Tree_node<_Value_type,_Voidptr> *)' being compiled
1>          with
1>          [
1>              _Value_type=std::pair<const key,std::function<void (void)>>,
1>              _Voidptr=void *,
1>              _Val_types=std::_Tree_simple_types<std::pair<const key,std::function<void (void)>>>
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(766) : see reference to class template instantiation 'std::_Tree_val<_Val_types>' being compiled
1>          with
1>          [
1>              _Val_types=std::_Tree_simple_types<std::pair<const key,std::function<void (void)>>>
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(884) : see reference to class template instantiation 'std::_Tree_alloc<_Al_has_storage,_Alloc_types>' being compiled
1>          with
1>          [
1>              _Al_has_storage=false,
1>              _Alloc_types=std::_Tree_base_types<std::pair<const key,std::function<void (void)>>,std::allocator<std::pair<const key,std::function<void (void)>>>>
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(996) : see reference to class template instantiation 'std::_Tree_buy<_Ty,_Alloc>' being compiled
1>          with
1>          [
1>              _Ty=std::pair<const key,std::function<void (void)>>,
1>              _Alloc=std::allocator<std::pair<const key,std::function<void (void)>>>
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(1029) : see reference to class template instantiation 'std::_Tree_comp<_Pr_has_storage,_Traits>' being compiled
1>          with
1>          [
1>              _Pr_has_storage=false,
1>              _Traits=std::_Tmap_traits<key,std::function<void (void)>,std::less<key>,std::allocator<std::pair<const key,std::function<void (void)>>>,false>
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\map(67) : see reference to class template instantiation 'std::_Tree<_Traits>' being compiled
1>          with
1>          [
1>              _Traits=std::_Tmap_traits<key,std::function<void (void)>,std::less<key>,std::allocator<std::pair<const key,std::function<void (void)>>>,false>
1>          ]
1>          c:\users\frizzlefry\documents\visual studio 2012\projects\3d game tut\3d game tut\input.h(21) : see reference to class template instantiation 'std::map<_Kty,_Ty>' being compiled
1>          with
1>          [
1>              _Kty=key,
1>              _Ty=std::function<void (void)>
1>          ]
1>  Generating Code...
1>
1>Build FAILED.
1>
1>Time Elapsed 00:00:02.70
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

struct Shortcut {
 bool shift;
 bool alt;
 // ...
 KeySym sym;
 struct Hasher {
  // some hash algorithm
 };
 // also add equality operator
};

using ShortcutsMap = unordered_map<Shortcut, function<void(void)>, Shortcut::Hash>;

using ShortcutsMap = unordered_map<unordered_set<Key>, function<void(void)>>;