Effective C++ -----条款20：宁以pass-by-reference-to-const替换pass-by-value Prefer pass-by-reference-to-const to pass-by-value
2015-03-09 22:15
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尽量以pass-by-reference-to-const替换pass-by-value。前者通常比较高校，并可避免切割问题（slicing problem).
以上规则并不适用于内置类型，以及STL的迭代器和函数对象。对它们而言，pass-by-value往往比较适当。
以上规则并不适用于内置类型，以及STL的迭代器和函数对象。对它们而言，pass-by-value往往比较适当。
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