C++ 中的“自由函数”一词是什么意思？
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What is the meaning of the term "free function" in C++?
提问by Jame
While reading the documentation for boost::test, I came across the term "free function". What I understand is that a free function is any function that doesn't return anything (Its return type is void). But after reading further it seems that free functions also don't take any arguments. But I am not sure. These all are my assumptions. So could anybody define free function?
在阅读 boost::test 的文档时，我遇到了“自由函数”这个词。我的理解是，自由函数是任何不返回任何内容的函数（其返回类型为 void）。但是在进一步阅读之后，似乎自由函数也不接受任何参数。但我不确定。这些都是我的假设。那么有人可以定义自由函数吗？
回答by Georg Fritzsche
The term free functionin C++ simply refers to non-member functions. Every function that is not a member function is a free function.
C++ 中的术语自由函数只是指非成员函数。每个不是成员函数的函数都是自由函数。
struct X {
void f() {} // not a free function
};
void g() {} // free function
int h(int, int) { return 1; } // also a free function
