function prototype with throw signature : Function Prototype « Function « C++

1. C++
2. Function
3. Function Prototype

function prototype with throw signature

  
#include <fstream>
#include <iostream>
#include <vector>
#include <string>
#include <stdexcept>

using namespace std;

void readIntegerFile(const string& fileName, vector<int>& dest) throw (invalid_argument, runtime_error);

void readIntegerFile(const string& fileName, vector<int>& dest)
  throw (invalid_argument, runtime_error)
{
  ifstream istr;
  int temp;

  istr.open(fileName.c_str());
  if (istr.fail()) {
    throw invalid_argument("");
  }

  while (istr >> temp) {
    dest.push_back(temp);
  }

  if (istr.eof()) {
    istr.close();
  } else {
    istr.close();
    throw runtime_error("");
  }
}

int main(int argc, char** argv)
{
  vector<int> myInts;
  const string fileName = "IntegerFile.txt";

  try {
    readIntegerFile(fileName, myInts);
  } catch (const invalid_argument& e) {
    cerr << "Unable to open file " << fileName << endl;
    exit (1);
  } catch (const runtime_error& e) {
    cerr << "Error reading file " << fileName << endl;
    exit (1);
  }

  for (size_t i = 0; i < myInts.size(); i++) {
    cout << myInts[i] << " ";
  }

  return (0);
}
  
    
  

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