2048: Do not allow the creation of games with invalid board sizes

The logic only works with nxn grids, so no need to take separate
row_size/column_size arguments.

Games/2048/Game.cpp

@@ -27,14 +27,13 @@
 #include "Game.h"
 #include <stdlib.h>
 
-Game::Game(size_t rows, size_t columns)
+Game::Game(size_t grid_size)
-    : m_rows(rows)
+    : m_grid_size(grid_size)
-    , m_columns(columns)
 {
-    m_board.resize(rows);
+    m_board.resize(grid_size);
     for (auto& row : m_board) {
-        row.ensure_capacity(columns);
+        row.ensure_capacity(grid_size);
-        for (size_t i = 0; i < columns; i++)
+        for (size_t i = 0; i < grid_size; i++)
             row.append(0);
     }
 
@@ -47,8 +46,8 @@ void Game::add_random_tile()
     int row;
     int column;
     do {
-        row = rand() % m_rows;
+        row = rand() % m_grid_size;
-        column = rand() % m_columns;
+        column = rand() % m_grid_size;
     } while (m_board[row][column] != 0);
 
     size_t value = rand() < RAND_MAX * 0.9 ? 2 : 4;

Games/2048/Game.h

@@ -30,7 +30,7 @@
 
 class Game final {
 public:
-    Game(size_t rows, size_t columns);
+    Game(size_t);
     Game(const Game&) = default;
 
     enum class MoveOutcome {
@@ -59,8 +59,7 @@ public:
 private:
     void add_random_tile();
 
-    size_t m_rows { 0 };
+    size_t m_grid_size { 0 };
-    size_t m_columns { 0 };
 
     Board m_board;
     size_t m_score { 0 };

Games/2048/main.cpp

@@ -75,7 +75,7 @@ int main(int argc, char** argv)
     main_widget.set_layout<GUI::VerticalBoxLayout>();
     main_widget.set_fill_with_background_color(true);
 
-    Game game { 4, 4 };
+    Game game { 4 };
 
     auto& board_view = main_widget.add<BoardView>(&game.board());
     board_view.set_focus(true);
@@ -90,7 +90,7 @@ int main(int argc, char** argv)
     update();
 
     auto start_a_new_game = [&]() {
-        game = Game(4, 4);
+        game = Game(4);
         update();
     };