The original assert for reference
1 | Assert((&Input->Controllers[0].Terminator - &Input->Controllers[0].Buttons[0]) == (ArrayCount(Input->Controllers[0].Buttons) - 1)); |
Since game_controller_input is a union, couldn't we copy-pasta the anonymous struct and add an identifier to the end of it?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | struct game_controller_input
{
bool32 IsConnected;
bool32 IsAnalog;
real32 StickAverageX;
real32 StickAverageY;
union
{
game_button_state Buttons[12];
struct
{
game_button_state MoveUp;
game_button_state MoveDown;
game_button_state MoveLeft;
game_button_state MoveRight;
game_button_state ActionUp;
game_button_state ActionDown;
game_button_state ActionLeft;
game_button_state ActionRight;
game_button_state LeftShoulder;
game_button_state RightShoulder;
game_button_state Back;
game_button_state Start;
};
struct
{
game_button_state MoveUp;
game_button_state MoveDown;
game_button_state MoveLeft;
game_button_state MoveRight;
game_button_state ActionUp;
game_button_state ActionDown;
game_button_state ActionLeft;
game_button_state ActionRight;
game_button_state LeftShoulder;
game_button_state RightShoulder;
game_button_state Back;
game_button_state Start;
} u;
};
};
|
This way, the assert becomes much more straightforward.
Comparison:
1 | Assert((&Input->Controllers[0].Terminator - &Input->Controllers[0].Buttons[0]) == (ArrayCount(Input->Controllers[0].Buttons) - 1)); |
1 | Assert(sizeof(Input->Controllers[0].Buttons) == sizeof(Input->Controllers[0].u)); |
I remember seeing in the MSDN docs somewhere that they did this with one of the structs we used. I'm trying to find info about this technique online but I don't know what it's called... :(