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++?
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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