std:: is_error_code_enum <std::io_errc>
|
Defined in header
<ios>
|
||
|
template
<>
struct is_error_code_enum < std:: io_errc > : public std:: true_type { } ; |
(since C++11) | |
This specialization of std::is_error_code_enum informs other library components that values of type std::io_errc are enumerations that hold error codes, which makes them implicitly convertible and assignable to objects of type std::error_code .
Inherited from std:: integral_constant
Member constants
|
value
[static]
|
true
(public static member constant) |
Member functions
|
operator bool
|
converts the object to
bool
, returns
value
(public member function) |
|
operator()
(C++14)
|
returns
value
(public member function) |
Member types
| Type | Definition |
value_type
|
bool |
type
|
std:: integral_constant < bool , value > |
Example
The comparison between e. code ( ) and std::io_errc::stream compiles because std:: is_error_code_enum < std:: io_errc > :: value == true .
#include <fstream> #include <iostream> 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"; if (e.code() == std::io_errc::stream) std::cout << "The error code is std::io_errc::stream\n"; } }
Output:
Caught an ios_base::failure. The error code is std::io_errc::stream
See also
|
(C++11)
|
identifies a class as an
error_code
enumeration
(class template) |
|
(C++11)
|
holds a platform-dependent error code
(class) |
|
(C++11)
|
the IO stream error codes
(enum) |