类初始化列表 [英] class initialization list

问题描述

一个关于c ++编码风格的简单问题，

Just a simple question about c++ coding style,

例如，如果我们不做任何其他操作，则将使用初始化列表中的默认构造函数调用类的所有成员变量. B默认构造函数将被调用，并且值将被设置为0，int();

for example, all member variables of a class will be called with the default constructor in the initialization list if we don't do anything else. B default constructor will be called and value will be set to 0, int();

class A
{
   A();
private:
   B b;
   int value;
}

但是我的问题是，即使是默认的构造函数也会被调用吗，这是一个总是自己做的好习惯，还是只会在代码中添加额外的行

However my question is, even do the default constructor will be called is it a good habit to always do it yourself or does it only add extra lines to the code

A :: A():b()，value(){}

A::A() : b(), value() {}

推荐答案

最好保留默认构造函数.编译器生成的构造函数比编写您自己的版本更可靠和可维护，并且除其他事项外，浪费时间来编写编译器可以为您编写的代码.如果不需要任何构造逻辑，请不要编写构造函数.

It's a good idea to leave the default constructor out. The compiler-generated constructors are much more reliable and maintainable than writing your own versions, and apart from anything else, it's a flat out waste of time to write code the compiler could write for you. If you don't need any construction logic, then don't write a constructor.

但是，除非您执行int的操作，否则不会初始化int，这是不得不编写构造函数的麻烦原因.

However, the int will not be initialized unless you do it, which is a sucky reason to have to write a constructor.

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