__eq__
"and_eq" is an inbuilt keyword that has been around since at least C++98. It is an alternative to &= (Bitwise AND Assignment) operator and it mostly uses for bit manipulations.
“ and_eq”是一個內置關鍵字，至少從C ++ 98起就存在。 它是＆= ( 按位與賦值 )運算符的替代方法，它主要用于位操作。
The and_eq keyword performs Bitwise AND operation and assigns the result to the left/first operand.
and_eq關鍵字執行按位與運算，并將結果分配給左/第一個操作數。
Syntax:
句法：
operand_1 and_eq operand_2;
Here, operand_1 and operand_2 are the operands.
在這里，操作數_1和操作數_2是操作數。
Example:
例：
Input:
bitset<4> value("1100");
bitset<4> mask ("1010");
value and_eq mask;
Output:
value = 1000
演示使用“ and_eq”關鍵字的C ++示例 (C++ example to demonstrate the use of "and_eq" keyword)
// C++ example to demonstrate the use of
// 'and_eq' keyword
#include <iostream>
#include <bitset>
using namespace std;
int main()
{
//bitsets
bitset<4> value("1011");
bitset<4> mask1("1100");
bitset<4> mask2("0100");
// before operation
cout << "value: " << value << endl;
cout << "mask1: " << mask1 << endl;
cout << "mask2: " << mask2 << endl;
value and_eq mask1;
cout << "After operation (1)...\n";
cout << "value: " << value << endl;
value and_eq mask2;
cout << "After operation (2)...\n";
cout << "value: " << value << endl;
return 0;
}
Output:
輸出：
value: 1011
mask1: 1100
mask2: 0100
After operation (1)...
value: 1000
After operation (2)...
value: 0000
翻譯自: https://www.includehelp.com/cpp-tutorial/and_eq-keyword-with-example.aspx
__eq__
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