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稱爲宇宙類使用類型國的數據成員,而美國使用類型宇宙的對象。我正在使用Visual C++ 2010 Express(如果這有什麼區別)。類(位於不同的報頭),該使用彼此的對象
States.h:
class Universes;
extern Universes universe;
class States
{
public:
int relations;
States();
};
States::States()
{
relations = universe.state_no;
}
Universes.h
#include "States.h"
class Universes
{
public:
States state;
int state_no;
};
Test.cpp的
#include "stdafx.h"
#include <iostream>
#include <conio.h>
#include "Universes.h"
using namespace System;
int main(array<System::String ^> ^args)
{
Universes universe;
_getch();
return 0;
}
我不斷收到以下錯誤:
States.h(16): error C2027: use of undefined type 'Universes'
States.h(1) : see declaration of 'Universes'
States.h(16): error C2228: left of '.state_no' must have class/struct/union
[Header files inclusion/Forward declaration]的可能重複(http://stackoverflow.com/questions/2832714/header-files-inclusion-forward-declaration) – SomeWittyUsername 2013-03-02 17:27:06