单类实例C ++ [英] Single class instance C++

问题描述

是否可以创建一个只能构造一次的类？如果您尝试创建其他实例，则会出现编译时错误。

Is it possible to create a class which could be constructed just one time? If you would try to create an other instance of it, a compile-time error should occure.

推荐答案

实例化是动态的，运行。编译错误在编译时。所以答案是否定的，不可能在任何第二次实例化时获得编译错误。

Instantiation is dynamic, at run time. Compilation errors are at compile time. So the answer is no, it's not possible to get a compilation error on any second instantiation.

然而，您可以使用单例，但是请仔细考虑它是否真的需要。

You can however use a singleton, but do consider very carefully whether it's really needed.

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