os.h

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#ifndef util_os_H
#define util_os_H
 
#include <boost/predef.h>
 
#if BOOST_OS_WINDOWS
#define CSC_OS_WINDOWS 1
#elif BOOST_OS_LINUX
#define CSC_OS_LINUX 1
#elif BOOST_OS_MACOS
#define CSC_OS_MACOS 1
#endif
 
#if CSC_OS_WINDOWS == 1
#define CSC_USER_DLL_EXPORT __declspec(dllexport)
#else
#define CSC_USER_DLL_EXPORT
#endif
 
// very important: on Windows, DLL cannot export a lot of symbols. It is possible to export all but it includes headers public members, hence a lot of potentially useless symbols
// we choose here, as the best practice commands us, to put on 
#if CSC_OS_WINDOWS == 1
    #if defined(CSC_CORE_BUILD)
        #define CSC_DLL_IMPORTEXPORT __declspec(dllexport)
    #elif defined(CSC_CORE_DLL)
        #define CSC_DLL_IMPORTEXPORT __declspec(dllimport)
    #else
        #define CSC_DLL_IMPORTEXPORT
    #endif
#else 
    #define CSC_DLL_IMPORTEXPORT
#endif
 
#endif