这是一个逗号操作符。
避免使用逗号操作符，除非在特定的for语句的控制部分。
Avoid the use of the comma operator except for very disciplined use in the control part of for statements.
逗号操作符(如本小节)中描述不能出现在上下文中使用逗号分隔列表中的条目(如参数初始化函数或列表)。
The comma operator (as described in this subclause) cannot appear in contexts where a comma is used to separate items in a list (such as arguments to functions or lists of initializers).
不可以用操作符、函数、逗号或开括号作为表达式结束符。
Expressions must not end with an operator, function, comma, or opening parenthesis.
不可以用操作符、逗号或闭括号作为表达式的开始符。
Expressions must not begin with an operator, comma, or closing parenthesis.
不可以用操作符、逗号或闭括号作为表达式的开始符。
Expressions must not begin with an operator, comma, or closing parenthesis.
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