webrtc中的基本類型定義，以後可以當庫使用

/* * libjingle * Copyright 2004 Google Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * *  1. Redistributions of source code must retain the above copyright notice, *     this list of conditions and the following disclaimer. *  2. Redistributions in binary form must reproduce the above copyright notice, *     this list of conditions and the following disclaimer in the documentation *     and/or other materials provided with the distribution. *  3. The name of the author may not be used to endorse or promote products *     derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */#ifndef TALK_BASE_BASICTYPES_H_#define TALK_BASE_BASICTYPES_H_#include <stddef.h>  // for NULL, size_t#if !(defined(_MSC_VER) && (_MSC_VER < 1600))#include <stdint.h>  // for uintptr_t#endif#ifdef HAVE_CONFIG_H#include "config.h"  // NOLINT#endif#include "talk/base/constructormagic.h"#if !defined(INT_TYPES_DEFINED)#define INT_TYPES_DEFINED#ifdef COMPILER_MSVC//這一塊整個是為int64和unint64服務的typedef unsigned __int64 uint64;typedef __int64 int64;#ifndef INT64_C#define INT64_C(x) x ## I64#endif#ifndef UINT64_C#define UINT64_C(x) x ## UI64#endif#define INT64_F "I64"#else  // COMPILER_MSVC// On Mac OS X, cssmconfig.h defines uint64 as uint64_t// TODO(fbarchard): Use long long for compatibility with chromium on BSD/OSX.#if defined(OSX)typedef uint64_t uint64;typedef int64_t int64;#ifndef INT64_C#define INT64_C(x) x ## LL#endif#ifndef UINT64_C#define UINT64_C(x) x ## ULL#endif#define INT64_F "l"#elif defined(__LP64__)typedef unsigned long uint64;  // NOLINTtypedef long int64;  // NOLINT#ifndef INT64_C#define INT64_C(x) x ## L#endif#ifndef UINT64_C#define UINT64_C(x) x ## UL#endif#define INT64_F "l"#else  // __LP64__typedef unsigned long long uint64;  // NOLINTtypedef long long int64;  // NOLINT#ifndef INT64_C#define INT64_C(x) x ## LL#endif#ifndef UINT64_C#define UINT64_C(x) x ## ULL#endif#define INT64_F "ll"#endif  // __LP64__#endif  // COMPILER_MSVC//上面整個這一塊是為64服務的，typedef unsigned int uint32;typedef int int32;typedef unsigned short uint16;  // NOLINTtypedef short int16;  // NOLINTtypedef unsigned char uint8;typedef signed char int8;#endif  // INT_TYPES_DEFINED// Detect compiler is for x86 or x64.#if defined(__x86_64__) || defined(_M_X64) || \    defined(__i386__) || defined(_M_IX86)#define CPU_X86 1#endif// Detect compiler is for arm.#if defined(__arm__) || defined(_M_ARM)#define CPU_ARM 1#endif#if defined(CPU_X86) && defined(CPU_ARM)#error CPU_X86 and CPU_ARM both defined.#endif//上面這一塊為x86和arm架構服務的，只能有一種架構#if !defined(ARCH_CPU_BIG_ENDIAN) && !defined(ARCH_CPU_LITTLE_ENDIAN)// x86, arm or GCC provided __BYTE_ORDER__ macros#if CPU_X86 || CPU_ARM ||  \  (defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)#define ARCH_CPU_LITTLE_ENDIAN#elif defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__#define ARCH_CPU_BIG_ENDIAN#else#error ARCH_CPU_BIG_ENDIAN or ARCH_CPU_LITTLE_ENDIAN should be defined.#endif#endif#if defined(ARCH_CPU_BIG_ENDIAN) && defined(ARCH_CPU_LITTLE_ENDIAN)#error ARCH_CPU_BIG_ENDIAN and ARCH_CPU_LITTLE_ENDIAN both defined.#endif//上面這一塊是為高位元組還是低位元組服務的#ifdef WIN32typedef int socklen_t;#endif//for socket // The following only works for C++#ifdef __cplusplusnamespace talk_base {  template<class T> inline T _min(T a, T b) { return (a > b) ? b : a; }  template<class T> inline T _max(T a, T b) { return (a < b) ? b : a; }  // For wait functions that take a number of milliseconds, kForever indicates  // unlimited time.  const int kForever = -1;}#define ALIGNP(p, t) \    (reinterpret_cast<uint8*>(((reinterpret_cast<uintptr_t>(p) + \    ((t) - 1)) & ~((t) - 1))))#define IS_ALIGNED(p, a) (!((uintptr_t)(p) & ((a) - 1)))// Note: UNUSED is also defined in common.h#ifndef UNUSED#define UNUSED(x) Unused(static_cast<const void*>(&x))#define UNUSED2(x, y) Unused(static_cast<const void*>(&x)); \    Unused(static_cast<const void*>(&y))#define UNUSED3(x, y, z) Unused(static_cast<const void*>(&x)); \    Unused(static_cast<const void*>(&y)); \    Unused(static_cast<const void*>(&z))#define UNUSED4(x, y, z, a) Unused(static_cast<const void*>(&x)); \    Unused(static_cast<const void*>(&y)); \    Unused(static_cast<const void*>(&z)); \    Unused(static_cast<const void*>(&a))#define UNUSED5(x, y, z, a, b) Unused(static_cast<const void*>(&x)); \    Unused(static_cast<const void*>(&y)); \    Unused(static_cast<const void*>(&z)); \    Unused(static_cast<const void*>(&a)); \    Unused(static_cast<const void*>(&b))inline void Unused(const void*) {}#endif  // UNUSED// Use these to declare and define a static local variable (static T;) so that// it is leaked so that its destructors are not called at exit.#define LIBJINGLE_DEFINE_STATIC_LOCAL(type, name, arguments) \  static type& name = *new type arguments#endif  // __cplusplus#endif  // TALK_BASE_BASICTYPES_H_

上面的這個代碼定義了基本的類型，以及硬體架構，位元組序，以後寫代碼就直接用了，不再去糾結於改用int，還是short，還是long等等，直接用int64，uint32豈不是更容易讀，而且方便。
這個庫代碼本身就是垮平台的，看到很多webrtc都有一個單元測試用例，於是我模仿者他們的模式也寫了一個簡單了，為了能逐漸培養自己的單元測試的思維：

#include "talk/base/basictypes.h"#include <stdio.h>#include <assert.h>void Test(){//assert the lenghtassert(sizeof(int8) == 1);assert(sizeof(uint8) == 1);assert(sizeof(int16) == 2);assert(sizeof(uint16) == 2);assert(sizeof(int32) == 4);assert(sizeof(int32) == 4);assert(sizeof(int64) == 8);assert(sizeof(uint64) == 8);//assert signed and unsignedint8 i8 = -1;assert(i8 == -1);uint8 ui8 = -1;assert(ui8 > 0);int16 i16 = -1;assert(i16 == -1);uint16 ui16 = -1;assert(ui16 > 0);int32 i32 = -1;assert(i32 == -1);uint32 ui32 = -1;assert(ui32 > 0);int64 i64 = -1;assert(i64 == -1);uint64 ui64 = -1;assert(ui64 > 0);//assert cpu archassert(CPU_X86);//X86//assert little_endian#ifdef ARCH_CPU_LITTLE_ENDIAN//little_endianassert(1);#elseassert(0);#endif//assert static varLIBJINGLE_DEFINE_STATIC_LOCAL(int, testname, ());//declare a static vartestname = 100;assert(testname == 100);//assert _max, _min#ifdef __cplusplusassert(talk_base::_max(10, 5) == 10);assert(talk_base::_max(10, 50)== 50);assert(talk_base::_max(10, -50)== 10);assert(talk_base::_min(10, 5) == 5);assert(talk_base::_min(10, 50) == 10);assert(talk_base::_min(10, -50) == -50);printf("Assert Success!\n");#endif }int main(){Test();return 0;}

一步一步搞定基本代碼程式，作為以後自己的庫。。。。