std::system_error::system_error

1	`system_error( std::error_code ec );`

(1)

(since C++11)

1	`system_error( std::error_code ec,` `const` `std::string& what_arg );`

(2)

(since C++11)

1	`system_error( std::error_code ec,` `const` `char* what_arg );`

(2)

(since C++11)

1	`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.

Parameters

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

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:

1	`Error:` `system:33 - Numerical argument out of domain`

Links:

http://en.cppreference.com/w/cpp/error/system_error/system_error

doc_CPP

2025-01-10 15:47:30

Comments