Assignment-1/general_functions.cpp

// License: AGPLv3 or later. https://www.gnu.org/licenses/licenses.html

#include <fstream>
#include <iostream>
#include <random>
# include "general_functions.h"

using namespace std;

vector<string> get_textfile_lines(std::string filename)
{
    ifstream file(filename);
    vector<string> file_lines;
    
	if (! file.good())
	{
		cerr << "Failed to open/read file: " << filename\
			<< ". Non-exhaustive list of possible reasons:\n"\
			<< "1. File does not exist.\n"\
			<< "2. Unable to read file due to:\n"\
			<< "2.1 Don't have read access to file\n"\
			<< "2.2 File is opened elsewhere and some program have a "\
			<< "lock on file.\n";
		exit(2);
	}
	
	cout << "Reading file: " << filename << endl;
	
    while (file.good())
    {
        string line;
        getline(file, line);
        file_lines.push_back(line);
    }
    
	file.close();
    
    return file_lines;
}

int random_int(int lower_bound, int upper_bound)
{
    static std::random_device seed;
    static std::mt19937 random_number_generator(seed());
    std::uniform_int_distribution<std::mt19937::result_type> range(
        lower_bound, upper_bound);
    return range(random_number_generator);
}

bool is_string_some_positive_number(std::string a_string)
{
	for (int i=0; i < a_string.size(); i++)
	{
		string character(1, a_string[i]);
		try
		{
			stoi(character);
		}
		catch(...)
		{
			return false;
		}
	}
	return true;
}