In C++, you can use the std::ifstream::fail() function to check if there was a failure during file operations. However, to get more detailed error messages, you can use the std::ifstream::rdstate() function in combination with std::strerror() or std::perror().
Here's an updated version of your code with more detailed error messages:
#include <iostream>
#include <fstream>
#include <cstring>
void open_file(std::ifstream& ifstream, const std::string& file_name)
{
ifstream.open(file_name);
if (ifstream.fail())
{
// Get the error code
std::ios_base::iostate state = ifstream.rdstate();
// Check for specific error bits
if (state & std::ios_base::eofbit)
{
std::cout << "End of file reached." << std::endl;
}
if (state & std::ios_base::failbit)
{
std::cout << "Non-fatal I/O error occurred." << std::endl;
}
if (state & std::ios_base::badbit)
{
std::cout << "Fatal I/O error occurred." << std::endl;
}
// Print system error message
std::perror("Error: ");
return;
}
std::cout << "File was opened successfully!" << std::endl;
}
In this code, we use std::ios_base::iostate to retrieve the error state of the ifstream object. Then, we check specific error bits like std::ios_base::eofbit, std::ios_base::failbit, and std::ios_base::badbit to provide more detailed information about the failure.
The std::perror() function is used to print the system error message corresponding to the error code. This will give you additional information about what went wrong.
Remember to include the necessary headers for this code to work:
#include <iostream>
#include <fstream>
#include <cstring>
