C++ transfer SDL_renderer to a class - c++

Question

I am currently learning SDL2 and just managed to create a ping pong game. Some friends told me that I should start using classes for managing as an example player1 and player2. I know how to create a class but I do not understand how I would be able to pass SDL_Renderer between classes in order to render an object from within the class to the main.cpp file.
#include "SDL2/SDL.h"
#include "SDL2/SDL_render.h"
#include <iostream>
#include <windows.h>
#include <thread>
#include "player.h"
Player Player; //defining the class
const int WINDOW_WIDTH = 1280;
const int WINDOW_HEIGHT = 720;
int main(int argc, char *args[]) {
SDL_Init(SDL_INIT_EVERYTHING);
SDL_Window *window;
SDL_Renderer *renderer;
window = SDL_CreateWindow ("Test",
SDL_WINDOWPOS_CENTERED,
SDL_WINDOWPOS_CENTERED,
WINDOW_WIDTH,
WINDOW_HEIGHT,
0
);
if (window == NULL) {
std::cout << "Window could not load" << SDL_GetError() << std::endl;
return 0;
}
renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
while (running) //running is a bool (true) {
Player.draw();
}
SDL_DestroyWindow(window);
SDL_Quit();
return 0;
}
What do I have to do in my player.cpp draw function in order to draw an object on the screen?
Using C++ windows, compiling the code with g++ main.cpp player.cpp -o main.exe -IC:\MinGW\i686-w64-mingw32\include -LC:\MinGW\i686-w64-mingw32\lib -lmingw32 -lSDL2main -lSDL2

Answer 1

In main.cpp
Player.draw(renderer)
(presuming you are using the same code as above, just pass "renderer" to the Player.draw() function.)
In player.h
class Player {
public:
void draw(SDL_Renderer *renderer)
};
In player.cpp
void Player::draw(SDL_Renderer *renderer) {
SDL_Rect object;
object.x = 0;
object.y = 0;
object.h = 10;
object.w = 10;
SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
SDL_RenderDrawRect(renderer, &object);
SDL_RenderFillRect(renderer, &object);
}
// will draw a white box with at position (0,0)
I believe this is a simple way to do it