A conditional test within a return statement

Question

what is the meaning of: return _a != MAX_A_VAL ? I've not seen conditionals in a return statement beyond ternary operators. What's this? By the way, this was used in an operator bool() class method.

Answer 1

这意味着进行比较_a != MAX_A_VAL ，然后返回其结果（ true或false ）

Answer 2

It means that if _a is NOT equal to MAX_A_VAL it should return true and otherwise it should return false

It's a boolean comparision.

It may be easier to read like so:

return (_a != MAX_A_VAL);

or another way you could look at it is:

bool retvalue = (_a != MAX_A_VAL);
return retvalue;

Answer 3

return语句可以使用任何表达式作为其返回值，它不必像变量一样简单。