本文介绍了非常量静态成员变量的C ++初始化?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我收到成员变量 objectCount的限定错误。编译器还会返回 ISO C ++禁止在类中初始化非const静态成员。
这是主要类别:
I got a qualification error of the member variable 'objectCount'. The compiler also returns 'ISO C++ forbids in-class intialization of non-const static member'.This is the main class:
#include <iostream>
#include "Tree.h"
using namespace std;
int main()
{
Tree oak;
Tree elm;
Tree pine;
cout << "**********\noak: " << oak.getObjectCount()<< endl;
cout << "**********\nelm: " << elm.getObjectCount()<< endl;
cout << "**********\npine: " << pine.getObjectCount()<< endl;
}
这是包含非常量静态objectCount的树类:
This is the tree class which contains the non-const static objectCount:
#ifndef TREE_H_INCLUDED
#define TREE_H_INCLUDED
class Tree
{
private:
static int objectCount;
public:
Tree()
{
objectCount++;
}
int getObjectCount() const
{
return objectCount;
}
int Tree::objectCount = 0;
}
#endif // TREE_H_INCLUDED
推荐答案
您必须在包含此标头的源文件中定义静态变量。
You have to define the static variable in the source file that includes this header.
#include "Tree.h"
int Tree::objectCount = 0; // This definition should not be in the header file.
// Definition resides in another source file.
// In this case it is main.cpp
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