运算符std :: string（）const？ [英] operator std::string() const?

问题描述

有人可以告诉我究竟是什么

Can somebody tell me what precisely

operator std::string()

代表？

推荐答案

转换运算符，允许对象显式或隐式转换为std ::串。当这样的转换发生时，调用操作符并且转换的结果是调用的结果。

It is a conversion operator that allows the object to be explicitly or implicitly casted to std::string. When such a cast occurs, the operator is invoked and the result of the cast is the result of the invocation.

作为隐式转换的示例，假设你有一个函数接受类型 std :: string 或 const std :: string& ，但不是给定的对象类型。将对象传递给该函数将导致转换操作符被调用，结果传递到函数而不是你的类型。

As an example of an implicit cast, suppose you had a function that accepted type std::string or const std::string&, but not the given object type. Passing your object to that function would result in the conversion operator being invoked, with the result passed to the function instead of your type.

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