在 C++ 中通过指针传递比通过引用传递有好处吗? [英] Are there benefits of passing by pointer over passing by reference in C++?

问题描述

在C++中指针传递比引用传递有什么好处?

What are the benefits of passing by pointer over passing by reference in C++?

最近，我看到了许多选择通过指针传递函数参数而不是通过引用传递的示例.这样做有什么好处吗?

Lately, I have seen a number of examples that chose passing function arguments by pointers instead of passing by reference. Are there benefits to doing this?

示例:

func(SPRITE *x);

调用

func(&mySprite);

对比

func(SPRITE &x);

调用

func(mySprite);

推荐答案

指针可以接收NULL参数，引用参数不能.如果您有可能希望传递无对象"，请使用指针而不是引用.

A pointer can receive a NULL parameter, a reference parameter can not. If there's ever a chance that you could want to pass "no object", then use a pointer instead of a reference.

此外，通过指针传递允许您在调用站点明确查看对象是通过值传递还是通过引用传递:

Also, passing by pointer allows you to explicitly see at the call site whether the object is passed by value or by reference:

// Is mySprite passed by value or by reference?  You can't tell 
// without looking at the definition of func()
func(mySprite);

// func2 passes "by pointer" - no need to look up function definition
func2(&mySprite);

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