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std::system_category

STD：系统[医]范畴

Defined in header ​​
const std::error_category& system_category(​(since C++11)

获取对操作系统报告的错误的静态错误类别对象的引用。对象需要重写虚拟函数。std::error_category::name()返回指向字符串的指针"system"它还需要覆盖虚拟函数。std::error_category::default_error_condition()映射与POSIX匹配的错误代码errno值到std::generic_category...

参数

%280%29

返回值

派生为未指定运行时类型的静态对象的引用。std::error_category...

例外

noexcept规格：

noexcept

例

二次

#include <iostream>
#include <system_error>
#include <iomanip>
#include <string>
 
int main()
{
    std::error_condition econd = std::system_category().default_error_condition(EDOM
    std::cout << "Category: " << econd.category().name() << '\n'
              << "Value: " << econd.value() << '\n'
              << "Message: " << econd.message() << '\n';
 
    econd = std::system_category().default_error_condition(10001
    std::cout << "Category: " << econd.category().name() << '\n'
              << "Value: " << econd.value() << '\n'
              << "Message: " << econd.message() << '\n';
}

二次

产出：

二次

Category: generic
Value: 33
Message: Numerical argument out of domain
Category: system
Value: 10001
Message: Unknown error 10001

二次

另见

generic_category (C++11)identifies the generic error category (function)
errc (C++11)the std::error_condition enumeration listing all standard <cerrno> macro constants (class)

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