重载<<符号重复链接错误 [英] overloading << with duplicate symbol linking error

问题描述

我的头快要爆炸了.我不明白我在尝试超载'<<'时做错了具有两个类(punto和vector)的运算符.这是代码，代码被写在类之外的类头文件中:

My head is near to explode. i can't understand that i'm doing wrong trying to overload the '<<' operator with two classes (punto and vector). Here is the code, the code is written in the class header file out of the classes:

   std::ostream& operator << (ostream& salida, const punto& origen)
    {   
        // Se escriben los campos separados por el signo
        salida << "Punto --> x: " << origen.xf << " , y: " << origen.yf;
        return salida;
    }

    std::ostream& operator << (ostream& salida, const vector& origen)
    {
        // Se escriben los campos separados por el signo
        salida << "Punto --> x: " << origen.p1.xf << " , y: " << origen.p1.yf;
            return salida;
    }

该错误发生在链接步骤中，并且类头没有双重链接，因为这是一个非常简单的示例.

The error goes in the linking step and there is no double link with the class header because it's a so simple example.

推荐答案

此特殊错误表示函数被编译为两个不同的翻译单元.如果将函数定义放在标头中并将其包含在两个不同的源文件中，则很可能会发生这种情况.

This particular error means a function gets compiled into two different translation units. This most likely happens if you put a function definition in a header and include it into two different source files.

从广义上讲，您有两种解决方案:

You have, broadly speaking, two solutions:

1. 在头文件中声明(不定义)您的函数.在源文件中定义(实现).
2. 将函数声明为静态或内联.

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