多参数构造函数上的显式关键字？ [英] Explicit keyword on multi-arg constructor?

问题描述

我最近遇到了一些奇怪的类，有三个构造函数：

I recently came across some weird looking class that had three constructors:

class Class
{
    public:
        explicit Class(int );

        Class(AnotherClass );

        explicit Class(YetAnotherClass, AnotherClass );

    // ...
}

对我来说真的有意义 - 我认为显式关键字是保护编译器选择的结构从外部类型。

This doesn't really make sense to me - I thought the explicit keyword is to protect compiler chosen construction from a foreign type.

这是允许的吗？

推荐答案

在C ++ 11中，多参数构造函数可以隐式转换为括号

In C++11 multi-parameter constructors can be implicitly converted to with brace initialization.

但是，在C ++ 11 显式之前，仅应用于单参数构造函数。对于多参数构造函数，它被忽略，无效。

However, before C++11 explicit only applied to single-argument constructors. For multiple-argument constructors, it was ignored and had no effect.

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