类之外的成员函数定义 [英] Member function definition outside of class

问题描述

是否可以在类声明之外定义函数或方法？
如：

Is it possible to define function or method outside class declaration? Such as:

class A 
{
    int foo;
    A (): foo (10) {}
}

int A::bar () 
{
    return foo;
}        

推荐答案

不要在类外部声明一个方法，类似于你如何在C中创建函数原型，然后定义它们，例如：

It is possible to define but not declare a method outside of the class, similar to how you can prototype functions in C then define them later, ie:

class A 
{
    int foo;
    A (): foo (10) {}
    int bar();
}

// inline only used if function is defined in header
inline int A::bar () { return foo; }   

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