raii/files/main.cpp

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/*
 *  This file is part of the gobelijn software.
 *  Gobelijn is free software: you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License as published by the
 *  Free Software Foundation, either version 3 of the License, or any later
 *  version. Gobelijn is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 *  or FITNESS FOR A PARTICULAR PURPOSE.
 *  See the GNU General Public License for details. You should have received
 *  a copy of the GNU General Public License along with the software. If not,
 *  see <http://www.gnu.org/licenses/>.
 *
 *  Copyright 2016, Jan Broeckhove.
 */
#include <cstdio>
#include <iostream>

#include "file.h"

using namespace Raii;

void printFile(File& file)
{
        int c;
        while ((c = file.ReadChar()) != EOF)
                std::cout << static_cast<char>(c);
        std::cout << std::endl;
}

int main()
{
        {
                // Open 'tmp_file.txt' in write-mode by invoking the constructor.
                File file("tmp_file.txt", "w");

                // Write the alphabet to the file (this is based on the assumption
                // that 'char' is an ASCII character, but that's actually fairly
                // reasonable for a small example like this)
                for (char c = 'a'; c <= 'z'; c++)
                        file.WriteChar(c);

                // 'tmp_file.txt' is closed automatically by the destructor when 'file'
                // goes out of scope (which is right about now).
        }
        {
                // Open 'tmp_file.txt' again by invoking the constructor, but this
                // time, we'll open it in read-mode.
                File file("tmp_file.txt", "r");

                // Dump the file's contents to stdout.
                printFile(file);

                // We can also close the file manually. The destructor will do nothing
                // in that case.
                file.Close();
        }
}