initializer.h

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/* +---------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)               |
   |                          http://www.mrpt.org/                             |
   |                                                                           |
   | Copyright (c) 2005-2017, Individual contributors, see AUTHORS file        |
   | See: http://www.mrpt.org/Authors - All rights reserved.                   |
   | Released under BSD License. See details in http://www.mrpt.org/License    |
   +---------------------------------------------------------------------------+ */

#pragma once

/** \file Usage: MRPT_INITIALIZER(func) { ... }
 * MRPT_INITIALIZER() should be used only once per library in its present cross-platform implementation.
 */
#if defined(_MSC_VER)
  #include <mrpt/config.h>
  #if defined(MRPT_BUILT_AS_DLL)
        #include <windows.h>
        #define MRPT_INITIALIZER(f) \
        static void f(); \
        BOOL WINAPI DllMain(HINSTANCE /*hinstDLL*/, DWORD fdwReason, LPVOID /*lpvReserved*/) \
        { \
                switch (fdwReason) { \
                case DLL_PROCESS_ATTACH: \
                        f(); \
                } \
                return TRUE; \
        } \
        static void f(void)
#else
        // Static libs in Windows: the hardest case, subject to 
        #define MRPT_INITIALIZER(f) \
                static void f(void); \
                struct f##_t_ { f##_t_(void) { f(); } }; static f##_t_ f##_; \
                static void f(void)
#endif
#else
        #include <stdio.h>
        #include <stdlib.h>
        #define MRPT_INITIALIZER(f) \
                static void f(void) __attribute__((constructor)); \
                static void f(void)
#endif