Question

1>GameWinMain.obj : error LNK2005: "bool __cdecl BPredicate(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?BPredicate@@YA_NABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@0@Z) already defined in Algorithms.obj
1>C:Algorithms.exe : fatal error LNK1169: one or more multiply defined symbols found

I m getting the latter when trying to declare a function in the header. I m not sure what s causing this, everything has include guards. Funny thing is: if I define the function in the header as inline, it compiles. Can anyone help?

见以下法典:

<>Algorithms.h>>

#pragma once

//...other code

bool BPredicate(const string& a, const string& b){
    string::const_iterator it;
    UINT numA = 0;
    UINT numB = 0;
    for (it = a.begin(); it != a.end(); ++it) {
        if((*it) ==    ) {
            if (*(it-1) !=    ) {
                ++numA;
            }
        }
    }
    for (it = b.begin(); it != b.end(); ++it) {
        if((*it) ==    ) {
            if (*(it-1) !=    ) {
                ++numB;
            }
        }
    }

    return (numA < numB);
}

<>GameWinMain.h

#pragma once

#define WIN32_LEAN_AND_MEAN
#include <windows.h>

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow);

<><><>GameWinMain.cpp>

#include "GameWinMain.h"
#include "GameEngine.h"
#include "Algorithms.h" 

#define GAME_ENGINE (GameEngine::GetSingleton())

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
    if (GAME_ENGINE == NULL) return FALSE; 

    GAME_ENGINE->SetGame(new Algorithms()); 

    return GAME_ENGINE->Run(hInstance, iCmdShow); 
}

Answer 1

你不能像这样界定领导者的职能。标识为static或inline 或将在包括负责人的所有来源档案中加以界定。

如果你想从几个来源档案中利用这一职能,则只用declare<>。

bool BPredicate(const string& a, const string& b);

(Note the semicolon and no function body.)

然后在您的档案中界定这一职能。

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