如何删除默认构造函数？ [英] How to delete the default constructor?

问题描述

有时我不想提供一个默认构造函数，也不想让编译器为我的类提供一个系统默认构造函数。在C ++ 11中我可以做类似的事情：

  class MyClass 
 {
 public：
 MyClass（）= delete; 
}; 
  

但目前我的讲师不允许我在我的作业。问题是：在C ++ 11之前，有没有办法告诉编译器停止隐式提供一个默认构造函数？

解决方案

我会说，使它私人..像

  class MyClass 
 {
 private：
 MyClass（）; 
} 
  

并且没有任何人（从类本身或朋友类外部）调用默认构造函数。另外，你将有三个选项来使用类：提供一个参数化的构造函数，或者使用它作为一个实用程序类（只有一个静态函数），或者在朋友类中创建这个类型的工厂。 / p>

Sometimes I don't want to provide a default constructor, nor do I want the compiler to provide a system default constructor for my class. In C++ 11 I can do thing like:

class MyClass 
{ 
  public: 
    MyClass() = delete; 
};

But currently my lecturer doesn't allow me to do that in my assignment. The question is: prior to C++ 11, is there any way to tell the compiler to stop implicitly provide a default constructor?

解决方案

I would say, make it private.. something like

class MyClass
{
private:
    MyClass();
}

and no one(from outside the class itself or friend classes) will be able to call default constructor. Also, then you'll have three options for using the class: either to provide a parameterized constructor, or use it as a utility class (one with static functions only), or to create a factory for this type in a friend class.

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