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Use a Direction enum for Square deltas

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Currently the NORTH/WEST/SOUTH/EAST values are of type Square, but conceptually they are not squares but directions. This patch separates these values into a Direction enum and overloads addition and subtraction to allow adding a Square to a Direction (to get a new Square).

I have also slightly trimmed the possible overloadings to improve type safety. For example, it would normally not make sense to add a Color to a Color or a Piece to a Piece, or to multiply or divide them by an integer. It would also normally not make sense to add a Square to a Square.

This is a non-functional change.
This commit is contained in:
syzygy1
2017-12-04 17:52:31 +01:00
committed by Marco Costalba
parent 2acda1fde3
commit 822695d4d3
10 changed files with 81 additions and 63 deletions
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6
src/position.cpp
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@@ -211,10 +211,10 @@ Position& Position::set(const string& fenStr, bool isChess960, StateInfo* si, Th
while ((ss >> token) && !isspace(token))
{
if (isdigit(token))
sq += Square(token - '0'); // Advance the given number of files
sq += (token - '0') * EAST; // Advance the given number of files
else if (token == '/')
sq -= Square(16);
sq += 2 * SOUTH;
else if ((idx = PieceToChar.find(token)) != string::npos)
{
@@ -787,7 +787,7 @@ void Position::do_move(Move m, StateInfo& newSt, bool givesCheck) {
if ( (int(to) ^ int(from)) == 16
&& (attacks_from<PAWN>(to - pawn_push(us), us) & pieces(them, PAWN)))
{
st->epSquare = (from + to) / 2;
st->epSquare = to - pawn_push(us);
k ^= Zobrist::enpassant[file_of(st->epSquare)];
}