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#############################################################################
##
#W vec8bit.gd GAP Library Steve Linton
##
#H @(#)$Id: vec8bit.gd,v 4.6 2002/04/15 10:05:26 sal Exp $
##
#Y Copyright (C) 1997, Lehrstuhl D fuer Mathematik, RWTH Aachen, Germany
#Y (C) 1998 School Math and Comp. Sci., University of St. Andrews, Scotland
#Y Copyright (C) 2002 The GAP Group
##
## This file should possibly be called vec8bit.g (see also vecmat.gd)
## It provides some things that the kernel needs from the library
##
Revision.vec8bit_gd :=
"@(#)$Id: vec8bit.gd,v 4.6 2002/04/15 10:05:26 sal Exp $";
#############################################################################
##
#R Is8BitVectorRep( <obj> ) . . . compressed vector over GFQ (3 <= q <= 256)
##
DeclareRepresentation( "Is8BitVectorRep", IsDataObjectRep,[],
IsRowVector and IsSmallList );
#############################################################################
##
#v TYPES_VEC8BIT . . . . . . . . prepared types for compressed GF(q) vectors
##
## A length 3 list of length 257 lists. TYPES_VEC8BIT[1][q] will be the type
## of mutable vectors over GF(q), TYPES_VEC8BIT[2][q] is the type of
## immutable vectors. TYPES_VEc8BIT[3][q] is the type of locked vectors.
## The 257th position is bound to 1 to stop the lists
## shrinking.
##
## It is accessed directly by the kernel, so the format cannot be changed
## without changing the kernel.
##
DeclareGlobalVariable( "TYPES_VEC8BIT" );
#############################################################################
##
#F TYPE_VEC8BIT( <q>, <mut> ) . . computes type of compressed GF(q) vectors
##
## Normally called by the kernel, caches results in TYPES_VEC8BIT
##
DeclareGlobalFunction( "TYPE_VEC8BIT" );
DeclareGlobalFunction( "TYPE_VEC8BIT_LOCKED" );
#############################################################################
##
#V TYPE_FIELDINFO_8BIT . . . . . . . . . . . . . type of the fieldinfo bags
##
## These bags are created by the kernel and accessed by the kernel. The type
## doesn't really say anything, because there are no applicable operations.
##
DeclareGlobalVariable( "TYPE_FIELDINFO_8BIT" );
#############################################################################
##
#M IsConstantTimeAccessList( <obj> )
#M IsSmallList( <obj> )
#M IsListDefault( <obj> )
##
## All compressed GF(q) vectors are small and constant-time access,
## and support the default list arithmetic (multiplication and addition).
##
InstallTrueMethod( IsConstantTimeAccessList, IsList and Is8BitVectorRep );
InstallTrueMethod( IsSmallList, IsList and Is8BitVectorRep );
InstallTrueMethod( IsListDefault, IsList and Is8BitVectorRep );
#############################################################################
##
#E
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