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POCalling convention "defines" without #define
 

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    <p>In Microsoft's WinDef.h several #defines for callbacks are introduced:</p> <pre><code>#ifdef _MAC #define CALLBACK PASCAL #define WINAPI CDECL #define WINAPIV CDECL #define APIENTRY WINAPI #define APIPRIVATE CDECL #ifdef _68K_ #define PASCAL __pascal #else #define PASCAL #endif #elif (_MSC_VER &gt;= 800) || defined(_STDCALL_SUPPORTED) #define CALLBACK __stdcall #define WINAPI __stdcall #define WINAPIV __cdecl #define APIENTRY WINAPI #define APIPRIVATE __stdcall #define PASCAL __stdcall #else #define CALLBACK #define WINAPI #define WINAPIV #define APIENTRY WINAPI #define APIPRIVATE #define PASCAL pascal #endif </code></pre> <p>Is there a way to do something like that without preprocessor macros? I would like to have something, that resolves to different calling conventions on Unix and Windows, but which - unlike a macro - can be namespaced.</p> <p>I have tried "typedef __stdcall test;" but that doesn't compile.</p> <p>EDIT - here is an example usage scenario:</p> <pre><code>namespace Thread { typedef startRoutineReturnType (startRoutineCallingConvention *startRoutineCallback)(void* pArg); } Thread::startRoutineReturnType Thread::startRoutineCallingConvention startRoutine(void* pArg); </code></pre> <p>This way startRoutine can confirm to the signature of that callback on all platforms although the calling convention of the callback differs between platforms. When there is the possibility that a lot of functions have to confirm to that callback signature then something like</p> <pre><code>#ifdef UNIX void* foo(void* pArg) #elif WINDOWS DWORD WINAPI foo(LPVOID pArg) #else // something else #endif { // body } </code></pre> <p>instead looks quite messy.</p>
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    1. USKaiserludi
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    1. COIt's because `__stdcall` is not a type.
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      1. USSome programmer dude
    2. COTo my knowledge there is no such thing as a "namespaced text substitution" feature in C++. The preprocessor doesn't know or care about namespaces.
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      1. UScdhowie
    3. COIt is unclear what you are asking. Calling conventions are clearly not *namespaced*!
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      1. USDavid Rodríguez - dribeas
 

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