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问题描述
是否有一种情况，其中pass-by-reference比C ++中的pass-by-value更昂贵？
Is there a case where pass-by-reference is more expensive than pass-by-value in C++? If so, what would that case be?
推荐答案
希望传递基本类型（int，char，float，...）
Prefer passing primitive types (int, char, float, ...) and POD structs that are cheap to copy (Point, complex) by value.
这将比通过引用传递时所需的间接效率更高。
This will be more efficient than the indirection required when passing by reference.
请参阅。 p>
See Boost's Call Traits.
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