[effectiv c++]条款20:pass-by-reference-to-const 与 pass-by-value(解决slicing问题)
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- 减少构造函数的开销
- 避免slicing(对象切割)问题:当一个derived class对象以by value方式传递并被视为一个base class对象,实参会调用base class的构造函数,当对象调用一个虚函数时,实际调用的时base class的函数而不是derived class的函数。
- 在C++编译器的底层,references往往以指针实现,pass-by-reference通常意味着真正传递的时指针。
- 对于内置类型,STL迭代器,函数对象,选择pass-by-value效率更高;其它类型尽量用pass-by-reference-to-const,高效并可避免slicing问题。
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