这些函数是我的大多数程序对象将使用的实用程序类型的东西。我想将它们放在一个命名空间中并让它们全局化。这个命名空间在头文件中定义,然后添加到我的预编译头文件中。然而到目前为止,我已经在 2 个不同的对象中使用了这个命名空间中的函数,并且编译器在这 2 个对象上抛出了多重定义的符号错误。
命名空间文件
#ifndef UTILS_H
#define UTILS_H
#include <random>
#include <cmath>
namespace Utils
{
extern int GetRandomBetween(int low, int high)
{
if (low < 0 || low >= high)
return 0;
int seed = high - low;
return (rand() % seed) + low;
}
};
#endif
和我的预压缩头
// stdafx.h : include file for standard system include files,
// or project specific include files that are used frequently, but
// are changed infrequently
//
#pragma once
#include "targetver.h"
//#define WIN32_LEAN_AND_MEAN // Exclude rarely-used stuff from Windows headers
// Windows Header Files:
#include <windows.h>
// C RunTime Header Files
#include <stdlib.h>
#include <malloc.h>
#include <memory.h>
#include <tchar.h>
#include <random>
#define SAFE_DELETE( p ) { if( p ) { delete ( p ); ( p ) = NULL; } }
#define SAFE_DELETE_ARRAY( p ) { if( p ) { delete[] ( p ); ( p ) = NULL; } }
#define SAFE_RELEASE( p ) { if( p ) { ( p )->Release(); ( p ) = NULL; } }
// TODO: reference additional headers your program requires here
#include "Utils.h"
#include "Manager.h" // this object uses utils
#include "Bot.h" // this object uses utils
#include "LinkedList.h"
#include "Village.h" // this object will use utils in the future
链接器错误消息:
Manager.obj : error LNK2005: "int __cdecl Utils::GetRandomBetween(int,int)" (?GetRandomBetween@Utils@@YAHHH@Z) already defined in Bot.obj
stdafx.obj : error LNK2005: "int __cdecl Utils::GetRandomBetween(int,int)" (?GetRandomBetween@Utils@@YAHHH@Z) already defined in Bot.obj
c:\users\lee\documents\visual studio 2010\Projects\AI\Debug\AI.exe : fatal error LNK1169: one or more multiply defined symbols found
还可能值得注意的是,在我的 Manager 类标题中,我转发了声明 Bot. 与 Village 类标题相同。