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⚡ Use FrozenDictionarys where possible #403

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Sep 14, 2023
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⚡ Use FrozenDictionarys where possible #403

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9 changes: 5 additions & 4 deletions src/Lynx/Constants.cs
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
using Lynx.Model;
using System.Collections.Frozen;

namespace Lynx;

Expand Down Expand Up @@ -100,7 +101,7 @@ public static class Constants
/// <summary>
/// Covert ASCII character pieces to encoded constants
/// </summary>
public static readonly IReadOnlyDictionary<char, Piece> PiecesByChar = new Dictionary<char, Piece>(12)
public static readonly FrozenDictionary<char, Piece> PiecesByChar = new Dictionary<char, Piece>(12)
{
['P'] = Piece.P,
['N'] = Piece.N,
Expand All @@ -115,7 +116,7 @@ public static class Constants
['r'] = Piece.r,
['q'] = Piece.q,
['k'] = Piece.k,
};
}.ToFrozenDictionary();

/// <summary>
/// Relevant bishop occupancy bit count per square
Expand Down Expand Up @@ -322,7 +323,7 @@ public static class Constants
public const string WhiteLongCastle = "e1c1";
public const string BlackLongCastle = "e8c8";

public static readonly IReadOnlyDictionary<int, int> EnPassantCaptureSquares = new Dictionary<int, int>(16)
public static readonly FrozenDictionary<int, int> EnPassantCaptureSquares = new Dictionary<int, int>(16)
{
[(int)BoardSquare.a6] = (int)BoardSquare.a6 + 8,
[(int)BoardSquare.b6] = (int)BoardSquare.b6 + 8,
Expand All @@ -341,7 +342,7 @@ public static class Constants
[(int)BoardSquare.f3] = (int)BoardSquare.f3 - 8,
[(int)BoardSquare.g3] = (int)BoardSquare.g3 - 8,
[(int)BoardSquare.h3] = (int)BoardSquare.h3 - 8,
};
}.ToFrozenDictionary();

/// <summary>
/// https://github.com/maksimKorzh/chess_programming/blob/master/src/bbc/make_move_castling_rights/bbc.c#L1474
Expand Down