在 C++ 中访问静态类变量? [英] Accessing static class variables in C++?

问题描述

重复:
C++:对静态类成员的未定义引用

Duplicate:
C++: undefined reference to static class member

如果我有这样的类/结构

If I have a class/struct like this

// header file
class Foo
{
   public:
   static int bar;
   int baz;
   int adder();
};

// implementation
int Foo::adder()
{
   return baz + bar;
}

这不起作用.我收到对‘Foo::bar’的未定义引用"错误.如何在 C++ 中访问静态类变量?

This doesn't work. I get an "undefined reference to `Foo::bar'" error. How do I access static class variables in C++?

推荐答案

您必须在实现文件中添加以下行:

You must add the following line in the implementation file:

int Foo::bar = you_initial_value_here;

这是必需的，以便编译器为静态变量留出空间.

This is required so the compiler has a place for the static variable.

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