2.简单变量初始化问题 [英] 2 simple variable initialization question

问题描述

可能重复：

之间有什么区别

  int x 5）; 
 int x = 5; 
  

&有什么区别，

  int const x（5）; 
 const int x（5）; 
  

解决方案

c> const ：

从右向左读取声明 p>

（参见Vandevoorde / JosutissC ++模板：完整指南）

例如：

  int const x; // x是一个常量int 
 const int x; // x是一个int，它是const 
 
 // easy。该规则在下面变得非常有用：
 int const * const p; // p is const-pointer to const-int 
 int const& p; // p是对const-int的引用
 int * const * p; // p是指向int的const指针的指针。 
  

自从我遵循这个经验法则，我从来没有再次错误地解释这样的声明。 >

（：sisab retcarahc-rep a no ton，sisab nekot-rep a no tfel-ot-thgir naem I hguohT：tidE

Possible Duplicate:
Is there a difference in C++ between copy initialization and direct initialization?

Is there any difference between,

int x(5);
int x = 5;

& What's the difference between,

int const x(5);
const int x(5);

解决方案

A really good rule of thumb regarding const:

Read Declarations Right-to-Left.

(see Vandevoorde/Josutiss "C++ Templates: The Complete Guide")

E.g.:

int const x; // x is a constant int
const int x; // x is an int which is const

// easy. the rule becomes really useful in the following:
int const * const p; // p is const-pointer to const-int
int const &p;        // p is a reference to const-int
int * const * p;     // p is a pointer to const-pointer to int.

Ever since I follow this rule-of-thumb, I never misinterpreted such declarations again.

(: sisab retcarahc-rep a no ton ,sisab nekot-rep a no tfel-ot-thgir naem I hguohT :tidE

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