gistfile1.cpp

// image_manager.hpp

#ifndef IMAGE_MANAGER_HPP
#define IMAGE_MANAGER_HPP

#include <SFML/System.hpp>
#include <SFML/Graphics.hpp>
#include <map>

using namespace sf;

class ImageManager {
public:
	static Texture getTexture(String path, IntRect = IntRect(0, 0, 0, 0), int frame = 0);
	
	static std::map<String, Texture> textures;
};

#endif

// image_manager.cpp

#include "image_manager.hpp"
#include <map>

Texture ImageManager::getTexture(String path, IntRect size, int frame) {
	if (textures.count(path)) {
		return textures[path];
	} else {
		textures[path] = Texture();
		textures[path].loadFromFile(path);
		return textures[path];
	}
}

ImageManager::getTexture should return Texture&, since sf::Textures are expensive to copy and most of the time you probably only want to bind a texture to an sf::Sprite.