简体繁体 English

带有指针的获取器和设置器

[英]Getters and Setters with pointers

原文 2014-02-17 18:49:42 6 1 c++

Okay so I'm a fairly new with C++ and I'm doing an assignment right now that requires many different classes. 好的，所以我是C ++的新手，我现在正在做一个需要许多不同类的作业。 Now I'm experienced with Java and i may still have that programming mentality in my brain but my question is: 现在，我对Java很有经验，但我的脑海中仍然可能有编程的念头，但我的问题是：

When you have two different classes, A and B , if B wants to access variables within A , I want to create a getter for the variable in A , but if that variable is a container that is heavy like a std::map , my question is would should i be making a getter that returns the pointer to the variable in A to access it in B ? 当您有两个不同的类A和B ，如果B要访问A变量，我想为A的变量创建一个吸气剂，但是如果该变量是一个像std::map这样重的容器，问题是我应该做一个使指针返回A中的变量以在B访问它的getter吗？

1 个解决方案

For containers like a map, there is no objection if a getter returns a handle to access the object in place. 对于像地图这样的容器，如果getter返回一个句柄以访问适当的对象，则没有异议。 It could be a pointer, but a reference might be more C++-ish. 它可能是一个指针，但引用可能更像C ++。

For objects that are compositions - objects that "own" other objects - getters should normally not provide direct access. 对于组成的对象-“拥有”其他对象的对象-吸气剂通常不应提供直接访问。 In Java you should not return the reference, and in C++ you should not return a pointer or reference. 在Java中，您不应返回引用，在C ++中，您不应返回指针或引用。 This, however, is more a style issue, following the advice of the OO pundits. 但是，遵循OO专家的建议，这更多是样式问题。