Prefer pass-by-reference-to-const over pass-by-value. It's typically more efficient and it avoids the slicing problem.
The rule doesn't apply to built-in types and STL iterator and function object types. For them, pass-by-value is usually appropriate.
The rule doesn't apply to built-in types and STL iterator and function object types. For them, pass-by-value is usually appropriate.
原文链接: https://www.cnblogs.com/zhtf2014/archive/2011/03/24/1994330.html
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