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        const 引用可以分配一个 int 吗?

        const reference can be assigned an int?(const 引用可以分配一个 int 吗?)
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                  本文介绍了const 引用可以分配一个 int 吗?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!



                  const int& reference_to_const_int = 20;
                    reference_to_const_int = "<<reference_to_const_int<<endl;     

                  此代码编译 &执行输出:-

                  This code compiles & executes with output :-

                  reference_to_const_int = 20

                  这对我来说很奇怪.据我所知参考不占用内存 &它们是其他变量的别名.因此我们不能说

                  This is something strange in for me. As I know reference do not occupy memory & they are aliases to other variables. hence we cannot say

                  int& reference_to_int = 30;


                  The above statement shall not compile giving error :-

                   error: invalid initialization of non-const reference of type ‘int&’ from an rvalue of type ‘int’

                  const int&"究竟发生了什么案件?需要完整的解释.

                  What exactly is happening in the "const int&" case? A full explanation is desired.




                  创建了一个临时对象,将 const 引用绑定到它是合法的,但将它绑定到非 const 引用是非法的code>const 一.

                  A temporary is created, and it's legal to bind a const reference to it, but illegal to bind it to a non-const one.


                  const int& reference_to_const_int = int(20);  //LEGAL
                        int& reference_to_const_int = int(20);  //ILLEGAL

                  const 引用延长了临时文件的生命周期,这就是它起作用的原因.这只是语言的规则.

                  A const reference extends the life of a temporary, that's why this works. It's just a rule of the language.

                  这篇关于const 引用可以分配一个 int 吗?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!



                  C++ stl unordered_map implementation, reference validity(C++ stl unordered_map 实现,参考有效性)
                  C++: Is it possible to use a reference as the value in a map?(C++:是否可以使用引用作为映射中的值?)
                  Where ampersand quot;amp;quot; can be put when passing argument by reference?(其中符号“amp;通过引用传递参数时可以放置吗?)
                  Why can a non-const reference parameter be bound to a temporary object?(为什么可以将非常量引用参数绑定到临时对象?)
                  What is a dangling reference?(什么是悬空引用?)
                  C++ reference changes when push_back new element to std::vector(当 push_back 新元素到 std::vector 时,C++ 引用发生变化)

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