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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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src/psqt.cpp
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@@ -116,7 +116,7 @@ void init() {
for (Square s = SQ_A1; s <= SQ_H8; ++s)
{
File f = std::min(file_of(s), FILE_H - file_of(s));
File f = std::min(file_of(s), ~file_of(s));
psq[ pc][ s] = v + Bonus[pc][rank_of(s)][f];
psq[~pc][~s] = -psq[pc][s];
}