| =在C ++中是什么意思 [英] What does |= means in c++

问题描述

我有代码行

  int i = 0; 
结果| = EXPECT_EQUAL（list.size（），3）; 
  

| = 的男人是什么？

我正在尝试编译以下内容：

  int结果| = 5 ; 
  

但出现错误：

  aaa.cpp：26：16：错误：'| ='令牌
  

解决方案

a | = b; 只是 a = a |的语法糖。 b; 。相同的语法对C ++中的几乎所有运算符均有效。

但是 int i | = 5; 是错误的，因为在定义行中必须进行初始化，

  int i = 3;  
 
 
  int i = 3; 
 i | = 5; 
  
有效，并且会将值7（3 | 5）赋予 i 。
 
I have code line
int i =0;
result |= EXPECT_EQUAL(list.size(),     3);
What does |= mens?

I was trying to compile something like:
int result |= 5;
but got error:
aaa.cpp:26:16: error: expected initializer before ‘|=’ token

解决方案
a |= b; is just syntactic sugar for a = a | b;. Same syntax is valid for almost every operator in C++. 

But int i |= 5; is an error, because in the definition line you must have an initialisation, that is an expression that does not use the variable being declared.
int i=3;
i |= 5;
is valid and will give value 7 (3 | 5) to i.

                        
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