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std::iostream_category

性病：：碘流[医]范畴

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

获取对iostream错误的静态错误类别对象的引用。对象需要重写虚拟函数。error_category::name()返回指向字符串的指针"iostream"它用于识别类型异常中提供的错误代码。std::ios_base::failure...

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 <fstream>
 
int main()
{
    std::ifstream f("doesn't exist"
    try {
        f.exceptions(f.failbit
    } catch (const std::ios_base::failure& e) {
        std::cout << "Caught an ios_base::failure.\n"
                  << "Error code: " << e.code().value() 
                  << " (" << e.code().message() << ")\n"
                  << "Error category: " << e.code().category().name() << '\n';
 
    }
}

二次

可能的产出：

二次

Caught an ios_base::failure.
Error code: 1 (unspecified iostream_category error)
Error category: iostream

二次

另见

failurestream exception (public member class of std::ios_base)
io_errc (C++11)the IO stream error codes (enum)

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