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Diffstat (limited to 'TAO/tao/Align.h')
| -rw-r--r-- | TAO/tao/Align.h | 84 |
1 files changed, 0 insertions, 84 deletions
diff --git a/TAO/tao/Align.h b/TAO/tao/Align.h deleted file mode 100644 index 34be66cf384..00000000000 --- a/TAO/tao/Align.h +++ /dev/null @@ -1,84 +0,0 @@ -// This may look like C, but it's really -*- C++ -*- -// @(#) $Id$ - -// ============================================================================ -// -// = LIBRARY -// TAO -// -// = FILENAME -// Align.h -// -// = DESCRIPTION -// Pointer alignment utilities -// -// A "ptr_arith_t" type is defined for doing numerical operations -// on pointers, such as aligning them. Pointer sizes vary from 2 -// to 8 bytes in today's environments; a portable data type is much -// needed. -// -// = AUTHOR -// Copyright 1994-1995 by Sun Microsystems, Inc. -// -// ============================================================================ - -#if !defined (TAO_ALIGN_H) -#define TAO_ALIGN_H - -// Type for doing arithmetic on pointers ... as elsewhere, we assume -// that "unsigned" versions of a type are the same size as the -// "signed" version of the same type. - -#if ACE_SIZEOF_VOID_P == ACE_SIZEOF_INT -typedef u_int ptr_arith_t; - -#elif ACE_SIZEOF_VOID_P == ACE_SIZEOF_LONG -typedef u_long ptr_arith_t; - -#elif ACE_SIZEOF_VOID_P == ACE_SIZEOF_LONG_LONG -typedef u_long long ptr_arith_t; - -#else -# error "Can't find a suitable type for doing pointer arithmetic." -#endif /* error */ - -// Efficiently align "value" up to "alignment", knowing that all such -// boundaries are binary powers and that we're using two's complement -// arithmetic. - -// Since the alignment is a power of two its binary representation is: -// alignment = 0...010...0 -// -// hence -// -// alignment - 1 = 0...001...1 = T1 -// -// so the complement is: -// -// ~(alignment - 1) = 1...110...0 = T2 -// -// Notice that there is a multiple of <alignment> in the range -// [<value>,<value> + T1], also notice that if -// -// X = ( <value> + T1 ) & T2 -// -// then -// -// <value> <= X <= <value> + T1 -// -// because the & operator only changes the last bits, and since X is a -// multiple of <alignment> (its last bits are zero) we have found the -// multiple we wanted. -// - -#define align_binary(ptr, alignment) \ - ((ptr + ((ptr_arith_t)((alignment)-1))) & (~((ptr_arith_t)((alignment)-1)))) - -// Efficiently round "ptr" up to an "alignment" boundary, knowing that -// all such boundaries are binary powers and that we're using two's -// complement arithmetic. -// -#define ptr_align_binary(ptr, alignment) \ - ((char *) align_binary (((ptr_arith_t) (ptr)), (alignment))) - -#endif /* TAO_ALIGN_H */ |