Author: Russell Reagan
Date: 09:29:11 11/24/03
Go up one level in this thread
On November 24, 2003 at 06:01:30, Reinhard Scharnagl wrote:
>Hello,
>
>I want to use the same source file (using different macros)
>twice to compile a move generator for the black and white
>side. How could this be done CPP _conform_?
>
>This attempt is for to avoid double (redundant) source code
>and its change management synchronizing.
>
>I hope that there are some experts with matching experiences
>on that.
>
>Regards, Reinhard.
I'm not sure if this is what you are trying to accomplish, but this is an
example that someone posted to another message board recently.
enum Color{White,Black};
template <Color c>
struct ColorTraits;
template <>
struct ColorTraits<White>{
static const Color Enemy = Black;
static u64 forward(u64 x){ return x<<8; }
static u64 backwards(u64 x){ return x>>8; }
static const Piece Pawn = WhitePawn;
static const Piece Night = WhiteNight;
//...
};
template <>
struct ColorTraits<Black>{
static const Color Enemy = White;
static u64 forward(u64 x){ return x>>8; }
static u64 back(u64 x){ return x<<8; }
static const Piece Pawn = BlackPawn;
static const Piece Knight = BlackKnight;
//...
};
template <Color c>
u64 passed_pawns(){
u64 obstacles = bitboard[ColorTraits<ColorTraits<c>::Enemy>::Pawn];
obstacles = ColorTraits<c>::back(obstacles);
obstacles |= Left(obstacles) | Right(obstacles); // Left and Right have
obvious definitions
obstacles |= ColorTraits<c>::back(obstacles);
obstacles |= ColorTraits<c>::back( ColorTraits<c>::back(obstacles) );
obstacles |= ColorTraits<c>::back( ColorTraits<c>::back(
ColorTraits<c>::back( ColorTraits<c>::back(obstacles) ) ) );
return bitboard[ColorTraits<c>::Pawn] & ~obstacles;
}
Then you can call passed_pawns<Black>() or passed_pawns<White>() and you only
have to write one function.
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