这是有效的C ++吗？ [英] Is this valid C++?

问题描述

以下代码编译最新的VC ++，而不是EDG或MINGW。

The following code compiles on the latest VC++, not EDG or MINGW.

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推荐答案

你想做什么？


在Derived中有一种方法：


void doSomething（int i） ;


隐藏Base :: doSomething（）。


如果你使用多态，这是一个错误，因为Derived :: doSomething（ ）永远不会使用Base指针或引用来调用。


另一方面，如果你正在进行基于对象的编程ramming，那么只要Derived :: doSomething（）不必在内部调用Base :: doSomething（）来恢复被Derived隐藏的Base中的代码，那就没关系。

What are you trying to do???

In Derived there is a method:

void doSomething(int i);

which hides Base::doSomething().

If you are using polymorphism, this is an error since Derived::doSomething() will never be called using a Base pointer or reference.

On the other hand, if you are doing object-based programming, then this would be OK so long as Derived::doSomething() did not have to internally call Base::doSomething() to recover the the code in Base that is being hidden by Derived.

你想做什么？


在Derived中有一种方法：

void doSomething（int i）;


隐藏Base :: doSomething（）。


如果使用多态，这是一个错误，因为Derived :: doSomething（）永远不会使用Base指针或引用调用。

What are you trying to do???

In Derived there is a method:

void doSomething(int i);

which hides Base::doSomething().

If you are using polymorphism, this is an error since Derived::doSomething() will never be called using a Base pointer or reference.

实际上代码实际上不应该做任何事情，我只是尽量使我的代码示例尽可能简洁。目的是授予对doSomething（）方法的访问权限，否则该方法将从Derived对象中隐藏，如下所示：

Actually the code is not really supposed to do anything, I just tried to make my code example as concise as possible. The intent is to grant access to the doSomething() method that would otherwise be hidden from a Derived object, like so:

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" using Base :: doSomething（）"没有提供模板参数或者您是否必须编写使用Base< T> :: doSomething（）？

"using Base::doSomething()" without supplying a template parameter or do you have to write "using Base<T>::doSomething()"?

你使用编译的那个。

You use the one that compiles.

只是试图让我的代码示例尽可能简洁。目的是授予对doSomething（）方法的访问权限，否则该方法将从Derived对象中隐藏，

just tried to make my code example as concise as possible. The intent is to grant access to the doSomething() method that would otherwise be hidden from a Derived object,

您可以这样编码。这不是推荐的，可以让你设置一个模糊的电话。但我已经看到了这个：

You can code this way. It''s not recommended and can set you up for an ambiguous call. But I have seen this done:

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