how to initialize Static data member in C++ (怎样初始化类的static数据成员)_how to initialize a static string in a class in c+-优快云博客

本文介绍了在C++中如何正确地声明和定义静态成员变量。包括基本的定义方式、常量初始化以及在不同作用域中的定义规则。

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The declaration of a static data member in the member list of a class is not adefinition. You must define the static member outside of the class declaration, in namespace scope. For example:
class X
{
public:
static int i;
};
int X::i = 0; // definition outside class declaration

If a static data member is of const integral orconst enumeration type, you may specify a constant initializer in the static data member's declaration. This constant initializer must be an integral constant expression. Note that the constant initializer is not a definition. You still need to define the static member in an enclosing namespace. The following example demonstrates this:

#include <iostream>
using namespace std;

struct X {
static const int a = 76;
};

const int X::a;

int main() {
cout << X::a << endl;
}

The tokens = 76 at the end of the declaration of static data membera is a constant initializer.