ASSIGN_OP 中的模式匹配任何标准的赋值运算符：=、+=、-=、*=，等等，但是注意不要匹配其他包含 = 的运算符，比如 == 和 =~。

The pattern in ASSIGN_OP matches any of the standard assignment operators: =, +=, -=, *=, etc. but carefully avoids matching other operators that contain =, such as == and =~.

youdao

目标在于避免意外地使用单等号赋值运算符而非双等号比较运算符

The goal here is to avoid accidentally using the single-equals assignment operator instead of the double-equals comparison operator

youdao

不过，可为类型定义隐式转换运算符，这样就可以对这些类型使用赋值运算符。

However, you can define implicit conversion operators for a type, which enable you to use the assignment operator with those types.

youdao

- And here as promised is that other operator -- looks a little weird, but because assignment is already using the equal sign to assign one value on the right to a variable on the left.

在这里正像所承诺的那样，其他的操作-,看起来有点怪异，但是因为“=“已经被用来当赋值运算符了,用来把右边的一个值赋值给左边的变量。

哈佛公开课 - 计算机科学课程节选

So this is the equality operator, whereas the single equal sign is the assignment operator.

所以这是相等操作符，然而那个单等号是一个赋值运算符。

哈佛公开课 - 计算机科学课程节选

The equal sign is really called the "assignment operator."

那个等号其实是个“赋值运算符“

哈佛公开课 - 计算机科学课程节选