Difference between revisions of "cpp/error/generic category"
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{{cpp/title|generic_category}} | {{cpp/title|generic_category}} | ||
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const std::error_category& generic_category() noexcept; | const std::error_category& generic_category() noexcept; | ||
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===Example=== | ===Example=== | ||
{{example | {{example | ||
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#include <cerrno> | #include <cerrno> | ||
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#include <string> | #include <string> | ||
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int main() | int main() | ||
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<< "Message: " << econd.message() << '\n'; | << "Message: " << econd.message() << '\n'; | ||
} | } | ||
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Category: generic | Category: generic | ||
Value: 33 | Value: 33 | ||
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===See also=== | ===See also=== | ||
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Latest revision as of 01:23, 1 September 2023
| Defined in header <system_error>
|
||
| const std::error_category& generic_category() noexcept; |
(since C++11) | |
Obtains a reference to the static error category object for generic errors. The object is required to override the virtual function error_category::name() to return a pointer to the string "generic". It is used to identify error conditions that correspond to the POSIX errno codes.
Contents |
[edit] Parameters
(none)
[edit] Return value
A reference to the static object of unspecified runtime type, derived from std::error_category.
[edit] Example
Run this code
#include <cerrno> #include <iostream> #include <string> #include <system_error> int main() { std::error_condition econd = std::generic_category().default_error_condition(EDOM); std::cout << "Category: " << econd.category().name() << '\n' << "Value: " << econd.value() << '\n' << "Message: " << econd.message() << '\n'; }
Output:
Category: generic Value: 33 Message: Numerical argument out of domain
[edit] See also
| (C++11) |
identifies the operating system error category (function) |
| (C++11) |
the std::error_condition enumeration listing all standard <cerrno> macro constants (class) |
