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errno

耶诺

Defined in header ​​
#define errno /*implementation-defined*/​​

errno用于错误指示的预处理宏。它扩展到静态%28，直到C++11%29线程-自C++11%29类型可修改的lvalue以来，本地%28int...

几个标准库函数通过将正整数写入errno。通常情况下，errno中列出的错误代码之一。<cerrno>作为以字母开头的宏常量E后面跟着大写字母或数字。

价值errno是​0​在程序启动时，尽管允许库函数将正整数写入errno无论是否发生错误，库函数都不会存储​0​在errno...

例

二次

#include <iostream>
#include <cmath>
#include <cerrno>
#include <cstring>
#include <clocale>
 
int main()
{
    double not_a_number = std::log(-1.0
    if (errno == EDOM) {
        std::cout << "log(-1) failed: " << std::strerror(errno) << '\n';
        std::setlocale(LC_MESSAGES, "de_DE.utf8"
        std::cout << "Or, in German, " << std::strerror(errno) << '\n';
    }
}

二次

可能的产出：

二次

log(-1) failed: Numerical argument out of domain
Or, in German, Das numerische Argument ist ausserhalb des Definitionsbereiches

二次

另见

E2BIG, EACCES, ..., EXDEVmacros for standard POSIX-compatible error conditions (macro constant)
perrordisplays a character string corresponding of the current error to stderr (function)
strerrorreturns a text version of a given error code (function)

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在CreativeCommonsAttribution下授权-ShareAlike未移植许可v3.0。

http：//en.cppreference.com/w/cpp/Error/errno

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