c++ - = 函数声明后删除的含义

Question

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

= delete 在这种情况下是什么意思？

是否还有其他“修饰符”(= 0 和 = delete 除外)？

Answer 1

删除函数是a C++11 feature :

The common idiom of "prohibiting copying" can now be expresseddirectly:

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

[...]

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

struct Z {
    // ...

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