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Simplify distance (#2109)

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Only called with Squares as argument, so remove unused variants.

As this is just syntax changes, only verified bench at high depth.

No functional change.
This commit is contained in:
Joost VandeVondele
2019-04-18 16:53:52 +02:00
committed by Marco Costalba
parent c4fc00ec49
commit f21b503982
2 changed files with 5 additions and 9 deletions
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10
src/bitboard.h
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@@ -237,15 +237,13 @@ inline bool aligned(Square s1, Square s2, Square s3) {
/// distance() functions return the distance between x and y, defined as the
/// number of steps for a king in x to reach y. Works with squares, ranks, files.
/// number of steps for a king in x to reach y.
template<typename T> inline int distance(T x, T y) { return std::abs(x - y); }
template<typename T1 = Square> inline int distance(Square x, Square y);
template<> inline int distance<File>(Square x, Square y) { return std::abs(file_of(x) - file_of(y)); }
template<> inline int distance<Rank>(Square x, Square y) { return std::abs(rank_of(x) - rank_of(y)); }
template<> inline int distance<Square>(Square x, Square y) { return SquareDistance[x][y]; }
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)); }
template<class T> constexpr const T& clamp(const T& v, const T& lo, const T& hi) {
return v < lo ? lo : v > hi ? hi : v;
}