“IF”参数评价顺序? [英] "IF" argument evaluation order?
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问题描述
if(a && b)
{
do something;
}
有可能从右到左计算参数)?
is there any possibility to evaluate arguments from right to left(b -> a)?
如果是,影响评估顺序?
if "yes", what influences the evaluation order?
推荐答案
评估顺序由标准指定,从左到右
。最左侧的表达式将始终使用&&
子句求值。
The evaluation order is specified by the standard and is left-to-right
. The left-most expression will always be evaluated first with the &&
clause.
如果你想要 b
首先进行评估:
If you want b
to be evaluated first:
if(b && a)
{
//do something
}
参数是方法,并且您希望对它们进行评估,而不考虑它们的结果:
If both arguments are methods and you want both of them to be evaluated regardless of their result:
bool rb = b();
bool ra = a();
if ( ra && rb )
{
//do something
}
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