std::system_error::system_error
system_error( std::error_code ec ); |
(1) | (since C++11) |
system_error( std::error_code ec, const std::string& what_arg ); |
(2) | (since C++11) |
system_error( std::error_code ec, const char* what_arg ); |
(2) | (since C++11) |
system_error( int ev, const std::error_category& ecat ); |
(3) | (since C++11) |
system_error( int ev, const std::error_category& ecat, const std::string& what_arg ); |
(4) | (since C++11) |
system_error( int ev, const std::error_category& ecat, const char* what_arg ); |
(4) | (since C++11) |
system_error( const system_error& other ) noexcept; |
(5) | (since C++11) |
Constructs new system error object.
1) Constructs with error code
ec
2) Constructs with error code
ec
and explanation string
what_arg
. The string returned by
what()
is guaranteed to contain
what_arg
as a substring.
3) Constructs with underlying error code
ev
and associated error category
ecat
.
4) Constructs with underlying error code
ev
, associated error category
ecat
and explanatory string
what_arg
. The string returned by
what()
is guaranteed to contain
what_arg
as a substring (assuming that it doesn't contain an embedded null character ).
5) Copy constructor. Initializes the contents with those of
other
. If
*this
and
other
both have dynamic type
std::system_error
then
std::strcmp(what(), other.what()) == 0
.
Parameters
ec | - | error code |
ev | - | underlying error code in the enumeration associated with ecat |
ecat | - | the category of error |
what_arg | - | explanatory string |
other | - | another system_error to copy |
Example
Demonstrates how to create a system_error exception from an errno
value.
#include <iostream> #include <system_error> int main() { try { throw std::system_error(EDOM, std::generic_category(), "hello world"); } catch (const std::system_error& ex) { std::cout << ex.code() << '\n'; std::cout << ex.code().message() << '\n'; std::cout << ex.what() << '\n'; } }
Possible output:
generic:33 Numerical argument out of domain hello world: Numerical argument out of domain
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