C++ 파일 읽을 때 exception 처리에 관한 질문입니다.

#include <fstream>
#include <iostream>
#include <stdexcept>
 
void f(const char* filename) {
    std::ifstream file;
    file.exceptions(std::ifstream::eofbit|std::ifstream::failbit|std::ifstream::badbit);
 
    try {
        file.open(filename);
        if (file.is_open())
	    std::cout << "file is open." << std::endl;
    } catch (const std::ifstream::failure& e) {
        // handle exception
        std::cerr << "exception in reading a file" << std::endl;
        std::cerr << "exception: " << e.what() << std::endl;
    } catch (const std::exception& e) {
        // handle exception
        std::cerr << "exception: " << e.what() << std::endl;
    } catch (...) {
        // handle exception
        std::cerr << "any exception!" << std::endl;
    }
}
 
int main() {
    //f("all.dat");
    f("bogus.txt");
    return 0;
}

void RawDataProcessor::_readRawData(const char* filename) {
    // might call rawData constructor several times
    // since its size is unknown.
 
    // open a file
    _inFile.exceptions(std::ifstream::eofbit|std::ifstream::failbit|std::ifstream::badbit);
    // see: <a href="http://www.cplusplus.com/ref/iostream/ios/exceptions.html
" rel="nofollow">http://www.cplusplus.com/ref/iostream/ios/exceptions.html
</a>    // badbit : critical error in stream buffer
    // eofbit : End-Of-File reached while extracting
    // failbit: failure extracting from stream
    try {
        _inFile.open(filename, std::ios::in);
        if (_inFile.is_open()) {
            // length of row
            std::string line;
            while (getline(_inFile,line)) {
                if (line.find('#')!=std::string::npos || line.empty()) {
                    //std::clog << "found : " << line << endl;
                    continue;
                }            
                //std::clog << line << endl;
                // I cannot understand the below statement :(, but it works
                std::istringstream iss(line);
                _rawData.push_back(Row(std::istream_iterator<double>(iss),
                                       std::istream_iterator<double>()));	
            }// end of while
        }// end of if
        _inFile.close();
     } catch (const std::ifstream::failure& e) {
        const char* msg = "exception raised in reading a raw data file : "; 
        std::cerr << msg << filename << std::endl;
        //abort();
        exit(EXIT_FAILURE);
    }
}