= 函数声明后删除的含义

Meaning of = delete after function declaration(= 函数声明后删除的含义)

问题描述

class my_class
{
    ...
    my_class(my_class const &) = delete;
    ...
};

= delete 在这种情况下是什么意思?

What does = delete mean in that context?

是否还有其他修饰符"(除了= 0 和= delete)?

Are there any other "modifiers" (other than = 0 and = delete)?

推荐答案

删除函数是一种 C++11个特点:

现在可以表达禁止复制"的常见成语直接:

The common idiom of "prohibiting copying" can now be expressed directly:

class X {
    // ...
    X& operator=(const X&) = delete;  // Disallow copying
    X(const X&) = delete;
};

[...]

删除"机制可用于任何功能.例如，我们可以消除这样的不需要的转换:

The "delete" mechanism can be used for any function. For example, we can eliminate an undesired conversion like this:

struct Z {
    // ...

    Z(long long);     // can initialize with an long long         
    Z(long) = delete; // but not anything less
};

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