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) |
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.Parameters
ec | - | error code |
ev | - | underlying error code in the enumeration associated with ecat |
ecat | - | the category of error |
what_arg | - | explanatory string |
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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