为什么该类对象声明起作用? [英] Why does this class object declaration work?

问题描述

假设我有一堂课

class Test{
  public:
    int x;
    Test(const Test& obj){x=obj.x;}
};

为什么

Test object_name(Test random_name);

运行，是否不需要另一个对象作为参数? 像Test random_name(Test another_random(...))一样，使它成为声明对象的永无止境的方式吗?

run and does not need another object as a parameter?. .Something like Test random_name(Test another_random(...)), making it a never ending way of declaring the object?

推荐答案

此行:

Test object_name(Test random_name);

声明一个名为object_name的函数，该函数将Test作为参数并返回Test.它没有声明对象.在另一个函数中声明这样的函数是完全合法的，它只是隐式地extern.

declares a function called object_name that takes a Test as a paramter and returns a Test. It does not declare an object. It is perfectly legal to declare a function like this inside another function, it's just implicitly extern.

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