SDL load image from file - c++

Question

I'm trying to learn SDL 2.0 and I've been following lazyfoo tutorials. The problem is that those tutorials keeps everything in one file. So I tried to split some things up when starting a new game-project. My problem is that when I seperated my texture class from the rest it sometimes crashes the program, not always but pretty often.
I have a global window and a global renderer which I'm using in my class. I get segfault at difference places in the program but always in one of the following functions.
bool myTexture::loadFromFile(string path) {
printf("In loadFromFile\n");
//Free preexisting texture
free();
//The final texture
SDL_Texture *l_newTexture = NULL;
//Load image at specified path
SDL_Surface *l_loadedSurface = IMG_Load(path.c_str());
if(l_loadedSurface == NULL) {
printf("Unable to load image %s! SDL_image Error: %s\n", path.c_str(), IMG_GetError());
} else {
//Color key image for transparancy
//SDL_SetColorKey(l_loadedSurface, SDL_TRUE, SDL_MapRGB(l_loadedSurface->format, 0, 0xFF, 0xFF));
//Create texture from surface pixels
l_newTexture = SDL_CreateTextureFromSurface(g_renderer, l_loadedSurface);
if(l_newTexture == NULL) {
printf("Unable to create texture from %s! SDL Error: %s\n", path.c_str(), SDL_GetError());
} else {
//Get image dimensions
m_width = l_loadedSurface->w;
m_height = l_loadedSurface->h;
}
//Get rid of old loaded surface
SDL_FreeSurface(l_loadedSurface);
}
m_texture = l_newTexture;
//return success
printf("end from file \n");
return m_texture != NULL;
}
void myTexture::free() {
printf("In myTexture::free\n");
//Free texture if it exist
if(m_texture != NULL) {
cout << (m_texture != NULL) << endl;
SDL_DestroyTexture(m_texture);
printf("Destroyed m_texture\n");
m_texture = NULL;
m_width = 0;
m_height = 0;
}
printf("end free\n");
}
After reading on SDL and other stuffs I understood that there might be some thread trying to deallocate something which it isn't allowed to deallocate. However I haven't threaded anything yet.

Answer 1

I managed to solve this by my own. It turned out that I never created a new myTexture object which was really idiotic. But I still don't understand how it managed to render it sometimes... for me it don't make any sense at all. I never created it but I could still call its render function sometimes...