重载输出运算符的问题 [英] issues with overloading the output operator

问题描述

我正在尝试重载我的输出操作符，但它给了我这些错误：


错误C2143：语法错误：在''&''之前缺少'';'' />

错误C2433：''ostream''：''朋友''不允许数据声明


错误C4430：缺少类型说明符 - 假设为int 。注意：C ++不支持default-int


错误C2061：语法错误：标识符''ostream''


错误C4430：缺少类型说明符 - 假设为int。注意：C ++不支持default-int


错误C2805：二进制''运算符<<''参数太少


这里我的头文件中的原型函数：

am trying to overload my output operator but it gives me these errors:

error C2143: syntax error : missing '';'' before ''&''

error C2433: ''ostream'' : ''friend'' not permitted on data declarations

error C4430: missing type specifier - int assumed. Note: C++ does not support default-int

error C2061: syntax error : identifier ''ostream''

error C4430: missing type specifier - int assumed. Note: C++ does not support default-int

error C2805: binary ''operator <<'' has too few parameters

here my prototype function in the header file:

展开 | 选择 | Wrap | 行号

推荐答案

尝试删除关键字<$ c $来自您的声明的c>朋友。


原因是你的功能只是一个功能;它不是任何类的方法。

Try dropping the keyword friend from your declaration.

The reason is that your function is just that, a function; it is not a method of any class.

感谢'的Oralloy但这不是我们如何重载输出流操作符！

如果你有任何其他建议请随意。

PS：这里的关键字朋友是强制性的！

thank''s Oralloy but this is not how we overload the output stream operator!
if you have any other suggestion please feel free.
PS: the keyword friend here is mandatory !

从你的帖子中，Oralloy是正确的，而且friend关键字是错误的。一个朋友只能出现在一个类声明中，你发布的内容不在一个类声明中。


然后，编译器出现问题& ;.这意味着当编译器到达&它遇到了麻烦。最有可能的是，ostream或MyPoint在使用之前尚未声明。检查yu是否包含了相应的标题。

From your posting, Oralloy is correct and the friend keyword is in error. A friend can only occur inside a class declaration and what you have posted is not inside a class declaration.

Then, the compiler has a problem with the &. That means that by the time the compiler reached an & it was in trouble. Most likely, either ostream or MyPoint has no been declared before being used. Check that yu have included the appropriate headers.

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