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std::system_error::system_error

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< cpp‎ | error‎ | system error
Revision as of 09:30, 15 August 2013 by P12 (Talk | contribs)

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std::system_error
Member functions
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.
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.

[edit] Parameters

ec - error code
ev - error code in base encoding
ecat - the category of error
what_arg - explanatory string

[edit] Example

Demonstrates how to create a system_error exception from a errno value

#include <iostream>
#include <system_error>
 
int main()
{
    try
    {
        throw std::system_error(EDOM, std::system_category());
    }
    catch (const std::system_error& error)
    {
        std::cout << "Error: " << error.code()
                  << " - " << error.code().message() << '\n';
    }
}

Output:

Error: system:33 - Numerical argument out of domain