如何在C ++中初始化一个静态const成员？ [英] How to initialize a static const member in C++?

问题描述

是否可以在构造函数之外初始化一个静态const值？是否可以在发现成员声明的相同位置初始化？

Is it possible to initialize a static const value outside of the constructor? Can it be initialized at the same place where member declarations are found?

class A {
private:
  static const int a = 4;
  /*...*/
};

推荐答案

如果你希望你的静态成员是任何其他类型，你必须在cpp文件中的某处定义它。

YES you can but only for int types. If you want your static member to be any other type, you'll have to define it somewhere in a cpp file.

class A{
private:
 static const int a = 4; // valid
 static const std::string t ; // can't be initialized here
 ...
 ...
};


// in a cpp file where the static variable will exist 
const std::string A::t = "this way it works";

此外，请注意，此规则已在C ++ 11中删除，特征），你可以在类成员声明中直接初始化你想要的。

Also, note that this rule have been removed in C++11, now (with a compiler providing the feature) you can initialize what you want directly in the class member declaration.

这篇关于如何在C ++中初始化一个静态const成员？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！