在 C++ 中，只有默认参数的构造函数是默认构造函数吗?

2021-12-30 00:00:00 constructor c++ default-constructor default-arguments

在以下代码中:

struct Foo
{
    Foo(int x=0);
};

构造函数算作默认构造函数吗?

Does the constructor count as a default constructor?

推荐答案

C++98 §12.1/5 (强调我的):

C++98 §12.1/5 (emphasis mine):

类 X 的默认构造函数是无需参数即可调用的 X 构造函数.如果类 X 没有用户声明的构造函数，则隐式声明默认构造函数.

A default constructor for a class X is a constructor of X that can be called without an argument. If there is no user-declared constructor for class X, a default constructor is implicitly declared.

所以是的，它确实算作默认构造函数.另见.

So yes, it does count as a default constructor. See also.

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