按值或引用传递枚举？
我的一般规则是按基本类型的值传递，并按对象的引用传递（如果需要，显然是 const 的）。但是，我不确定对枚举类型采取什么路线。我认为按值传递是首选，因为它们看起来很小，但我想听听其他人的想法。
My general rule is to pass by value for primitive types and pass by reference for objects (obviously const'd if need be). However, I'm not sure what route to take with enumerated types. I'd assume that pass by value is preferred since they are seemingly small, but I'd like to hear others thoughts.
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没有其他想法。枚举只是化装舞会（或西装，如果您愿意的话）中的积分值。它没有内部结构，只要有机会就会在寄存器中移动。如果您要按值传递 int，那么也可以这样传递枚举。
No other thoughts. An enum is just an integral value in a fancy dress (or suit, if you prefer). It has no internal structure and will travel in a register given a chance. If you'd pass an int by value, pass an enum that way, too.
枚举有一个底层表示类型，即整数类型。没有更多的理由（也没有更少的理由）通过引用传递它们，就像有理由通过引用传递整数类型一样。
Enum have a underlying representation type which is an integer types. There are no more reasons (and no less) to pass them by reference that there are reasons to pass integer types by reference.