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Introduce distance() and unify some API

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Original work by Lucas.

No functional change.
This commit is contained in:
Marco Costalba
2014-11-08 14:04:14 +01:00
parent 8631b08d97
commit 6fb0a1bc40
7 changed files with 63 additions and 69 deletions
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15
src/bitboard.h
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@@ -112,17 +112,12 @@ inline bool more_than_one(Bitboard b) {
return b & (b - 1);
}
inline int square_distance(Square s1, Square s2) {
return SquareDistance[s1][s2];
}
template<typename T> inline int distance(T x, T y) { return x < y ? y - x : x - y; }
template<> inline int distance<Square>(Square x, Square y) { return SquareDistance[x][y]; }
inline int file_distance(Square s1, Square s2) {
return dist(file_of(s1), file_of(s2));
}
inline int rank_distance(Square s1, Square s2) {
return dist(rank_of(s1), rank_of(s2));
}
template<typename T1, typename T2> inline int distance(T2 x, T2 y);
template<> inline int distance<File>(Square x, Square y) { return distance(file_of(x), file_of(y)); }
template<> inline int distance<Rank>(Square x, Square y) { return distance(rank_of(x), rank_of(y)); }
/// shift_bb() moves bitboard one step along direction Delta. Mainly for pawns.