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Introduce variadic make_bitboard()

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Adds a helper function to make a bitboard from a list of squares.

No functional change
This commit is contained in:
Chris Cain 2018-03-06 01:32:16 +01:00 • committed by Stéphane Nicolet
parent 450f04969c
commit 3192b09fe0
2 changed files with 18 additions and 6 deletions
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12
src/bitboard.h
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@ -150,7 +150,17 @@ inline Bitboard file_bb(Square s) {
}
/// shift() moves a bitboard one step along direction D. Mainly for pawns
/// make_bitboard() returns a bitboard from a list of squares
constexpr Bitboard make_bitboard() { return 0; }
template<typename ...Squares>
constexpr Bitboard make_bitboard(Square s, Squares... squares) {
return (1ULL << s) | make_bitboard(squares...);
}
/// shift() moves a bitboard one step along direction D (mainly for pawns)
template<Direction D>
constexpr Bitboard shift(Bitboard b) {

12
src/pawns.cpp
View file

@ -236,11 +236,13 @@ Entry* probe(const Position& pos) {
template<Color Us>
Value Entry::shelter_storm(const Position& pos, Square ksq) {
const Color Them = (Us == WHITE ? BLACK : WHITE);
const Bitboard ShelterMask = (Us == WHITE ? 1ULL << SQ_A2 | 1ULL << SQ_B3 | 1ULL << SQ_C2 | 1ULL << SQ_F2 | 1ULL << SQ_G3 | 1ULL << SQ_H2
: 1ULL << SQ_A7 | 1ULL << SQ_B6 | 1ULL << SQ_C7 | 1ULL << SQ_F7 | 1ULL << SQ_G6 | 1ULL << SQ_H7);
const Bitboard StormMask = (Us == WHITE ? 1ULL << SQ_A3 | 1ULL << SQ_C3 | 1ULL << SQ_F3 | 1ULL << SQ_H3
: 1ULL << SQ_A6 | 1ULL << SQ_C6 | 1ULL << SQ_F6 | 1ULL << SQ_H6);
constexpr Color Them = (Us == WHITE ? BLACK : WHITE);
constexpr Bitboard ShelterMask =
Us == WHITE ? make_bitboard(SQ_A2, SQ_B3, SQ_C2, SQ_F2, SQ_G3, SQ_H2)
: make_bitboard(SQ_A7, SQ_B6, SQ_C7, SQ_F7, SQ_G6, SQ_H7);
constexpr Bitboard StormMask =
Us == WHITE ? make_bitboard(SQ_A3, SQ_C3, SQ_F3, SQ_H3)
: make_bitboard(SQ_A6, SQ_C6, SQ_F6, SQ_H6);
enum { BlockedByKing, Unopposed, BlockedByPawn, Unblocked };