Error handling

The basic steps are done, the main functionality is implemented. However, there may be errors which we have to recognize and handle meaningfully. The first error can occur during the loading of the texture. For example, the specified file might not exist, or the file might have an invalid image format, or be too big for the video memory of the graphics card. To handle such errors, the method sf::Texture::loadFromFile() returns a Boolean value that is true in case of success, and false in case of failure.

There are several strategies to react to resource loading errors. In our case, we have to consider that the texture is later needed by sprites that are rendered on the screen—if such a sprite requests the texture, we must give something back. One possibility would be to provide a default texture (for example, plain white), so the sprites are just drawn as a white rectangle. However, we do not want the player of our game to fiddle around with rectangles; he should either have...