在case语句标准C / C ++省略号 [英] Are Elipses in case statements standard C/C++

问题描述

我在浏览一些code在Linux内核和我遇到的声明是像为'0'...'9'：

I was browsing some code in the linux kernel and I came across the statements like case '0' ... '9':

要尝试了这一点，我创建下面的测试程序。

To try this out I created the test program below.

#include <iostream>

int main()
{
    const int k = 15;

    switch (k)
    {
    case 0 ... 10:
        std::cout << "k is less than 10" << std::endl;
        break;
    case 11 ... 100:
        std::cout << "k is between 11 and 100" << std::endl;
        break;
    default:    
        std::cout << "k greater than 100" << std::endl;
        break;
    }
}   

上述程序并编译，虽然我从来没有的情况下，语句结构遇到的省略号之前。这是标准的C和C ++或者这是一个GNU特定扩展的语言？

The program above does compile although I have never come across the elipses in case statement construct before. Is this standard C and C++ or is this a GNU specific extension to the language?

推荐答案

这是的 GNU C编译器的受案范围扩展程序，它不是标准C或C ++。

That is the case range extension of the GNU C compiler, it is not standard C or C++.

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