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Game Programming Using Qt by Lorenz Haas, Witold Wysota

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Time for action – functionality of a tic-tac-toe board

We need to implement a function that will be called upon by clicking on any of the nine buttons on the board. It has to change the text of the button that was clicked on—either X or O—based on which player made the move; then, it has to check whether the move resulted in winning the game by the player (or a draw if no more moves are possible), and if the game ended, it should emit an appropriate signal, informing the environment about the event.

When the user clicks on a button, the clicked() signal is emitted. Connecting this signal to a custom slot lets us implement the mentioned functionality, but since the signal doesn't carry any parameters, how do we tell which button caused the slot ...

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