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// error_code observers: value, category and message
#include <iostream>
#include <system_error>
#include <fstream>
#include <string>
int main()
{
std::ifstream is;
is.exceptions (std::ios::failbit);
try {
is.open ("unexistent.txt");
} catch (std::system_error e) {
std::cout << "Exception caught (system_error): " << std::endl;
std::cout << "Error: " << e.what() << std::endl;
std::cout << "Code: " << e.code().value() << std::endl;
std::cout << "Category: " << e.code().category().name() << std::endl;
std::cout << "Message: " << e.code().message() << std::endl;
}
}
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