Tuesday, June 6, 2017

Digest for comp.lang.c++@googlegroups.com - 5 updates in 3 topics

"Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com>: Jun 06 10:44PM +0200

On 23-May-17 6:07 PM, Alf P. Steinbach wrote:
> compile time.
 
> And I'd like that to not have a heavy 3rd party library dependency, such
> as Boost.
 
With the feedback I got on that original posting (thanks!) I've
 
• Changed the macro name from g++'s `__BYTE_ORDER__` to
`STDLIB_BYTE_ORDER`.
• Removed silly powerpc platform checking, for where would it end?
 
Is this reasonable then?
 
 
-----------------------------------------------------------------------------
#pragma once // Source encoding: utf-8 ∩
// #include <stdlib/workarounds/__BYTE_ORDER__.hpp>
//
// Copyright © 2017 Alf P. Steinbach, distributed under Boost license 1.0.
 
#ifdef __BYTE_ORDER__
# define STDLIB_BYTE_ORDER __BYTE_ORDER__
#
# if !( defined( __ORDER_LITTLE_ENDIAN__ ) && \
defined( __ORDER_BIG_ENDIAN__) && \
defined( __ORDER_PDP_ENDIAN__ ) )
# error __BYTE_ORDER__ is defined but one or more value macros are
missing.
# endif
#
# define STDLIB_LITTLE_ENDIAN __ORDER_LITTLE_ENDIAN__ // 1234
# define STDLIB_BIG_ENDIAN __ORDER_BIG_ENDIAN__ // 4321
# define STDLIB_MIXED_ENDIAN __ORDER_PDP_ENDIAN__ // 3412
#else
# // The values used by the g++ compiler:
# define STDLIB_LITTLE_ENDIAN 1234
# define STDLIB_BIG_ENDIAN 4321
# define STDLIB_MIXED_ENDIAN 3412
#
# if defined( _WIN32 )
# define STDLIB_BYTE_ORDER STDLIB_LITTLE_ENDIAN
# elif defined( __BIG_ENDIAN__ ) || defined( __BIG_ENDIAN ) ||
defined( _BIG_ENDIAN )
# define STDLIB_BYTE_ORDER STDLIB_BIG_ENDIAN
# else
# error Please define STDLIB_BYTE_ORDER, e.g. as STDLIB_LITTLE_ENDIAN.
# endif
Posted by at

No comments:

Post a Comment

Subscribe to: Post Comments (Atom)