Text Alignment C++ (console)

main.cpp

// Origin: https://stackoverflow.com/questions/22983008/how-to-print-justified-text-in-the-console-using-modern-c
#include <iostream>
#include <iomanip>
#include <sstream>
#include <list>
#include <iterator>

const int pageWidth = 78;
typedef std::list<std::string> WordList;
typedef void (*PrintLineFunction)( const std::string );

enum class Alignment {
    Left,
    Right,
    Center,
    Justify
};

WordList splitTextIntoWords( const std::string &text )
{
    WordList words;
    std::istringstream in(text);
    std::copy(std::istream_iterator<std::string>(in),
              std::istream_iterator<std::string>(),
              std::back_inserter(words));
    return words;
}

void justifyLine( std::string line )
{
    size_t pos = line.find_first_of(' ');
    if (pos != std::string::npos) {
        while (line.size() < pageWidth) {
            pos = line.find_first_not_of(' ', pos);
            line.insert(pos, " ");
            pos = line.find_first_of(' ', pos+1);
            if (pos == std::string::npos) {
                pos = line.find_first_of(' ');
            }
        }
    }
    std::cout << line << std::endl;
}

void _printText( const std::string &text, PrintLineFunction printLineFunc )
{
    WordList words = splitTextIntoWords(text);

    std::string line;
    for (const std::string& word : words) {
        if (line.size() + word.size() + 1 > pageWidth) { // next word doesn't fit into the line.
            printLineFunc(line);
            line.clear();
            line = word;
        } else {
            if (!line.empty()) {
                line.append(" ");
            }
            line.append(word);
        }
    }
    if (printLineFunc != justifyLine)
        printLineFunc(line);
    else
        std::cout << line << std::endl;
}

void printLineLeft( const std::string line )
{
    std::cout << line << std::endl;
}

void printLineRight( const std::string line )
{
    std::cout << std::setw(pageWidth) << std::right << line << std::endl;
}

void printLineCenter( const std::string line )
{
    std::cout << std::string((pageWidth - line.size())/2, ' ') << line << std::endl;
}

void printText( const std::string &text, Alignment align )
{
    PrintLineFunction array[] = { printLineLeft, printLineRight, printLineCenter, justifyLine };
    _printText(text, array[static_cast<size_t>(align)]);
}

int main()
{
    std::string text =
        "This small code sample will format a paragraph which "
        "is passed to the justify text function to fill the "
        "selected page with and insert breaks where necessary. "
        "It is working like the justify formatting in text "
        "processors.";
    printText(text, Alignment::Left);    std::cout << std::endl;
    printText(text, Alignment::Right);   std::cout << std::endl;
    printText(text, Alignment::Center);  std::cout << std::endl;
    printText(text, Alignment::Justify); std::cout << std::endl;
    return 0;
}