为什么需要显式编写'auto'关键字? [英] Why do I need to explicitly write the 'auto' keyword?

问题描述

我正在从C ++ 98迈向C ++ 11，并且已经熟悉auto关键字.我想知道为什么如果编译器能够自动推断类型，我们为什么需要显式声明auto.我知道C ++是一种强类型的语言，这是一条规则，但是如果不显式声明变量auto，是否不可能实现相同的结果?

I am moving towards C++11 from C++98 and have become familiar with the auto keyword. I was wondering why we need to explicitly declare auto if the compiler is able to automatically deduce the type. I know C++ is a strongly typed language and this is a rule but was it not possible to achieve the same outcome without explicitly declaring a variable auto?

推荐答案

删除显式auto会破坏语言:

例如

int main()
{
    int n;
    {
        auto n = 0; // this shadows the outer n.
    }
}

在其中您可以看到，放下auto不会遮盖外在n.

where you can see that dropping the auto would not shadow the outer n.

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