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C++ Macro code substitution

开发者 https://www.devze.com 2023-02-19 23:36 出处:网络
1) - i have two enums enum FixedScriptingEvent { FIXED_SCRIPTING_EVENT_NOTOUCH, FIXED_SCRIPTING_EVENT_OVER_MOVED,

1) - i have two enums

enum FixedScriptingEvent {
    FIXED_SCRIPTING_EVENT_NOTOUCH,  
    FIXED_SCRIPTING_EVENT_OVER_MOVED,
    FIXED_SCRIPTING_EVENT_OVER_RELEASED,    
    FIXED_SCRIPTING_EVENT_OUTSIDE_RELEASED,
    FIXED_SCRIPTING_EVENT_OUTSIDE_MOVED,    
...

enum InputState {

    INPUT_STATE_NOTOUCH,
    INPUT_STATE_OVER_MOVED,
    INPUT_STATE_OVER_RELEASED,
    INPUT_STATE_OUTSIDE_RELEASED,
    INPUT_STATE_OUTSIDE_MOVED,  
    INPUT_STATE_OUTSIDE_PRESSED,
...

2) i have an association between these two macros and need to call this code for each

if (inputMonitor.state.current == INPUT_STATE_NOTOUCH) {
    executeScriptsForEvent( FIXED_SCRIPTING_EVENT_INPUT_STATE_CHANGED_TO_NOTOUCH );
}
if (inputMonitor.state.current == INPUT_STATE_MOVED) {
    executeScriptsForEvent( FIXED_SCRIPTING_EVENT_INPUT_STATE_CHANGED_TO_MOVED );
}

3) so i made this macro

    #define EXECUTEFIXEDSCRIPTEVENTFORSTATE(x, y) if (inputMonitor.state.current == x) {executeScriptsForEvent( y );}

    EXECUTEFIXEDSCRIPTEVENTFORSTATE(INPUT_STATE_NOTOUCH, FIXED_SCRIPTING_EVENT开发者_JS百科_INPUT_STATE_CHANGED_TO_NOTOUCH);
    EXECUTEFIXEDSCRIPTEVENTFORSTATE(INPUT_STATE_OVER_MOVED, FIXED_SCRIPTING_EVENT_INPUT_STATE_CHANGED_TO_OVER_MOVED);
    EXECUTEFIXEDSCRIPTEVENTFORSTATE(INPUT_STATE_OVER_RELEASED, FIXED_SCRIPTING_EVENT_INPUT_STATE_CHANGED_TO_OVER_RELEASED);

    #undef EXECUTEFIXEDSCRIPTEVENTFORSTATE(x, y)

which is fine

4) the question, how can i do smth like this

#define EXECUTEFIXEDSCRIPTEVENTFORSTATE(x)\
if (inputMonitor.state.current == INPUT_STATE_(x)) {\
executeScriptsForEvent( FIXED_SCRIPTING_EVENT_INPUT_STATE_CHANGED_TO_(x) );
}\

so i only need to

    EXECUTEFIXEDSCRIPTEVENTFORSTATE(NOTOUCH);

which should be equivalent to my current :

EXECUTEFIXEDSCRIPTEVENTFORSTATE(INPUT_STATE_NOTOUCH, FIXED_SCRIPTING_EVENT_INPUT_STATE_CHANGED_TO_NOTOUCH);

but the compiler states that NOTOUCH is not defined, so i cant the macro from 4


Token concatenation?

#define EXECUTEFIXEDSCRIPTEVENTFORSTATE(x)\
if (inputMonitor.state.current == INPUT_STATE_ ## x) {\
executeScriptsForEvent(FIXED_SCRIPTING_EVENT_INPUT_STATE_CHANGED_TO_ ## x);\
}
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