[SFML/C++] redefinition of class, dzielene kodu

#include <SFML/Graphics.hpp>
#include <SFML/Window.hpp>
#include "tilemap.hpp"

bool TileMap::load( const std::string & tileset, sf::Vector2u tileSize, const int * tiles, unsigned int width, unsigned int height )
{
    sf::Texture m_tileset;
    //Wczytywanie tekstur tileset
    if( !m_tileset.loadFromFile( tileset ) )
    {
        return false;
    }
    //Level size
    sf::VertexArray m_vertices;
    m_vertices.setPrimitiveType( sf::Quads );
    m_vertices.resize( width * height * 4 );
   
    for( unsigned int i = 0; i < width; i++ )
    {
        for( unsigned int j = 0; j < height; j++ )
        {
            //pobieranie obecnego numeru tile
            int tileNumber = tiles[ i + j * width ];
           
            // find its position in the tileset texture
            int tu = tileNumber %( m_tileset.getSize().x / tileSize.x );
            int tv = tileNumber /( m_tileset.getSize().x / tileSize.x );
           
            // get a pointer to the current tile's quad
            sf::Vertex * quad = & m_vertices[( i + j * width ) * 4 ];
           
            // define its 4 corners
            quad[ 0 ].position = sf::Vector2f( i * tileSize.x, j * tileSize.y );
            quad[ 1 ].position = sf::Vector2f(( i + 1 ) * tileSize.x, j * tileSize.y );
            quad[ 2 ].position = sf::Vector2f(( i + 1 ) * tileSize.x,( j + 1 ) * tileSize.y );
            quad[ 3 ].position = sf::Vector2f( i * tileSize.x,( j + 1 ) * tileSize.y );
           
            // define its 4 texture coordinates
            quad[ 0 ].texCoords = sf::Vector2f( tu * tileSize.x, tv * tileSize.y );
            quad[ 1 ].texCoords = sf::Vector2f(( tu + 1 ) * tileSize.x, tv * tileSize.y );
            quad[ 2 ].texCoords = sf::Vector2f(( tu + 1 ) * tileSize.x,( tv + 1 ) * tileSize.y );
            quad[ 3 ].texCoords = sf::Vector2f( tu * tileSize.x,( tv + 1 ) * tileSize.y );
           
        }
    }
    return true;
}

void TileMap::draw( sf::RenderTarget & target, sf::RenderStates states ) const
{
    // apply the transform
    states.transform *= getTransform();
   
    // apply the tileset texture
    states.texture = & m_tileset;
   
    // draw the vertex array
    target.draw( m_vertices, states );
}