在C ++中通过引用传递指针是否有好处？ [英] Are there benefits of passing by pointer over passing by reference in C++?

问题描述

在C ++中通过引用传递指针对传递的好处是什么？

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

最近，我看到了一些选择通过指针传递函数参数的例子通过参考。这是否有好处？

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);

拨打

func(&mySprite);

vs。

func(SPRITE &x);

拨打

func(mySprite);

推荐答案

指针可以接收NULL参数，不能。如果有机会，你可能想传递无对象，然后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，传递指针允许你明确看到在调用站点无论对象是通过值还是引用：

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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