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2026-02-21 17:11:31 +09:00
commit 18b4338361
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--- a/project/fm_viewer/fav/prepost.h
+++ b/project/fm_viewer/fav/prepost.h
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+/******************************************************************************
+    prepost.h: Add function calls before/after main()
+    Copyright (C) 2012-2013 Wang Bin <wbsecg1@gmail.com>
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+******************************************************************************/
+
+#ifndef PREPOST_H
+#define PREPOST_H
+
+/*Avoid a compiler warning when the arguments is empty,
+ *e.g. PRE_FUNC_ADD(foo). The right one is PRE_FUNC_ADD(f,)*/
+
+/*
+ * TODO:
+ *  boost::call_once
+ *  http://stackoverflow.com/questions/4173384/how-to-make-sure-a-function-is-only-called-once
+ *  http://publib.boulder.ibm.com/infocenter/lnxpcomp/v8v101/index.jsp?topic=%2Fcom.ibm.xlcpp8l.doc%2Flanguage%2Fref%2Fco.htm
+ */
+#ifdef __cplusplus
+/* for C++, we use non-local static object to call the functions automatically before main().
+ * anonymous namespace: avoid name confliction('static' keyword is not necessary)
+ *
+ */
+#define PRE_FUNC_ADD(f, .../*args*/) \
+    namespace { \
+        static const struct initializer_for_##f { \
+            inline initializer_for_##f() { \
+                f(__VA_ARGS__); \
+            } \
+        }  __sInit_##f; \
+    }
+
+#define POST_FUNC_ADD(f, .../*args*/) \
+    namespace { \
+        static const struct deinitializer_for_##f { \
+            inline deinitializer_for_##f() {} \
+            inline ~deinitializer_for_##f() { f(__VA_ARGS__); } \
+        } __sDeinit_##f; \
+    }
+
+#else /*for C. ! defined __cplusplus*/
+/*
+ *http://buliedian.iteye.com/blog/1069072
+ *http://research.microsoft.com/en-us/um/redmond/projects/invisible/src/crt/md/ppc/_crt.c.htm
+ */
+#if defined(_MSC_VER)
+#pragma section(".CRT$XIU", long, read)
+#pragma section(".CRT$XPU", long, read)
+#define _CRTALLOC(x) __declspec(allocate(x))
+
+/*TODO: Auto unique naming*/
+typedef int (__cdecl *_PF)(); /* why not void? */
+/*static to avoid multiple defination*/
+#define PRE_FUNC_ADD(f, .../*args*/) \
+    static int init_##f() { f(__VA_ARGS__); return 0;} \
+    _CRTALLOC(".CRT$XIU") static _PF pinit_##f [] = { init_##f }; /*static void (*pinit_##f)() = init_##f //__cdecl */
+#define POST_FUNC_ADD(f, .../*args*/) \
+    static int deinit_##f() { f(__VA_ARGS__); return 0;} \
+    _CRTALLOC(".CRT$XPU") static _PF pdeinit_##f [] = { deinit_##f };
+#elif defined(__GNUC__)
+#define PRE_FUNC_ADD(f, ...) \
+    __attribute__((constructor)) static void init_##f() { f(__VA_ARGS__); }
+#define POST_FUNC_ADD(f, ...) \
+    __attribute__((destructor)) static void deinit_##f() { f(__VA_ARGS__); }
+
+#else
+#ifndef __cplusplus
+#error Not supported for C: PRE_FUNC_ADD, POST_FUNC_ADD
+#endif
+#include <stdlib.h>
+/*static var init, atexit*/
+#define PRE_FUNC_ADD(f, ...) \
+    static int init_##f() { f(__VA_ARGS__); return 0; } \
+    static int v_init_##f = init_##f();
+/*Works for C++. For C, gcc will throw an error:
+ *initializer element is not constant */
+/*atexit do not support arguments*/
+#define POST_FUNC_ADD(f, ...) \
+    static void atexit_##f() { atexit(f); } \
+    PRE_FUNC_ADD(atexit_##f)
+#endif
+#endif //__cplusplus
+#endif // PREPOST_H