std::iostream_category
From cppreference.com
Defined in header
<ios>
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const std::error_category& iostream_category();
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(since C++11) | |
Obtains a reference to the static error category object for iostream errors. The object is required to override the virtual function error_category::name() to return a pointer to the string "iostream". It is used to identify error codes provided in the exceptions of type std::ios_base::failure.
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[edit] Parameters
(none)
[edit] Return value
A reference to the static object of unspecified runtime type, derived from std::error_category.
[edit] Exceptions
noexcept specification:
noexcept
[edit] Example
Run this code
#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'; } }
Possible output:
Caught an ios_base::failure. Error code: 1 (unspecified iostream_category error) Error category: iostream
[edit] See also
stream exception (public member class of std::ios_base )
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(C++11)
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the IO stream error codes (enum) |