Heyy, I want to draw a sprite in my SFML application but its texture is always white when I use an image and a texture that are class members
Class members:
This is called the white square problem.
Basically, at some point, your object is copied but the copy constructor doesn't update the copied sprite texture to use the copied texture, and the original texture is destroyed so the copied sprite doesn't have a valid texture anymore.
A quick fix can simply run the initialisation code inside the copy constructor and copy assignment operator.
BTW
myimg_texture.create(icon.width, icon.height);
myimg_texture.update(myimg_image);
can directly use icon.pixelData instead of myimg_image and thus you don't need an sf::Image at all.
Or you can do as follow if you need the sf::Image for another purpose:
myimg_texture.loadFromImage(myimg_image);