'SDL2/SDL.h' file not found

declaration uses identifier '_engine_hpp', which is reserved in the global namespace

class 'engine' defines a default destructor but does not define a copy constructor, a copy assignment operator, a move constructor or a move assignment operator

prefer using 'override' or (rarely) 'final' instead of 'virtual'

function 'window' should be marked [[nodiscard]]

use a trailing return type for this function

function 'renderer' should be marked [[nodiscard]]

use a trailing return type for this function

use a trailing return type for this function

function 'entitymanager' should be marked [[nodiscard]]

use a trailing return type for this function