std::vector<std::vector<int>>

for (std::vector<std::vector<Tile>>::const_iterator layerRow = ...) {}

class Map
{
  public:
    using tileLayerVector_t = std::vector<std::vector<Tile>>;
    using rawDataLayerVector_t = std::vector<std::vector<int>>;
    tileLayerVector_t getTileLayer(const std::string pLayerName) const;
    void generateTileMapLayer(const std::string pMapLayerName, const rawDataLayerVector_t pRawMapData, const std::shared_ptr<Texture> pTexture);
}

#include <map.h>

tileLayerVector_t Map::getTileLayer(const std::string pLayerName) const
{
  return mapLayers.at(pLayerName);
}


void Map::generateTileMapLayer(const std::string pMapLayerName, const
rawDataLayerVector_t pRawMapData, const std::shared_ptr<Texture> pTexture)
{
  int tileCount = 0;
  int xPos = 0;
  int yPos = 0;

  ...

  std::pair<std::string, tileLayerVector_t> tileLayer(pMapLayerName, tileMapLayer);
  mapLayers.insert(tileLayer);
}