ddfb6adb98
In my #8489 we want to use boost's small_vector type, but that PR is kinda messy by adding boost and also making a meaningful change. So here I'm splitting out the boost addition to its own PR so that one can be more focused on the allocation improvement and consumption of boost.
96 lines
3.6 KiB
C++
96 lines
3.6 KiB
C++
// (C) Copyright John Maddock 2001 - 2003.
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// Use, modification and distribution are subject to the
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// Boost Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org for most recent version.
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// All POSIX feature tests go in this file,
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// Note that we test _POSIX_C_SOURCE and _XOPEN_SOURCE as well
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// _POSIX_VERSION and _XOPEN_VERSION: on some systems POSIX API's
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// may be present but none-functional unless _POSIX_C_SOURCE and
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// _XOPEN_SOURCE have been defined to the right value (it's up
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// to the user to do this *before* including any header, although
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// in most cases the compiler will do this for you).
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# if defined(BOOST_HAS_UNISTD_H)
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# include <unistd.h>
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// XOpen has <nl_types.h>, but is this the correct version check?
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# if defined(_XOPEN_VERSION) && (_XOPEN_VERSION >= 3)
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# define BOOST_HAS_NL_TYPES_H
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# endif
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// POSIX version 6 requires <stdint.h>
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# if defined(_POSIX_VERSION) && (_POSIX_VERSION >= 200100)
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# define BOOST_HAS_STDINT_H
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# endif
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// POSIX version 2 requires <dirent.h>
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# if defined(_POSIX_VERSION) && (_POSIX_VERSION >= 199009L)
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# define BOOST_HAS_DIRENT_H
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# endif
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// POSIX version 3 requires <signal.h> to have sigaction:
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# if defined(_POSIX_VERSION) && (_POSIX_VERSION >= 199506L)
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# define BOOST_HAS_SIGACTION
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# endif
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// POSIX defines _POSIX_THREADS > 0 for pthread support,
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// however some platforms define _POSIX_THREADS without
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// a value, hence the (_POSIX_THREADS+0 >= 0) check.
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// Strictly speaking this may catch platforms with a
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// non-functioning stub <pthreads.h>, but such occurrences should
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// occur very rarely if at all.
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# if defined(_POSIX_THREADS) && (_POSIX_THREADS+0 >= 0) && !defined(BOOST_HAS_WINTHREADS) && !defined(BOOST_HAS_MPTASKS)
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# define BOOST_HAS_PTHREADS
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# endif
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// BOOST_HAS_NANOSLEEP:
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// This is predicated on _POSIX_TIMERS or _XOPEN_REALTIME:
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# if (defined(_POSIX_TIMERS) && (_POSIX_TIMERS+0 >= 0)) \
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|| (defined(_XOPEN_REALTIME) && (_XOPEN_REALTIME+0 >= 0))
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# define BOOST_HAS_NANOSLEEP
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# endif
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// BOOST_HAS_CLOCK_GETTIME:
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// This is predicated on _POSIX_TIMERS (also on _XOPEN_REALTIME
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// but at least one platform - linux - defines that flag without
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// defining clock_gettime):
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# if (defined(_POSIX_TIMERS) && (_POSIX_TIMERS+0 >= 0))
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# define BOOST_HAS_CLOCK_GETTIME
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# endif
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// BOOST_HAS_SCHED_YIELD:
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// This is predicated on _POSIX_PRIORITY_SCHEDULING or
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// on _POSIX_THREAD_PRIORITY_SCHEDULING or on _XOPEN_REALTIME.
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# if defined(_POSIX_PRIORITY_SCHEDULING) && (_POSIX_PRIORITY_SCHEDULING+0 > 0)\
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|| (defined(_POSIX_THREAD_PRIORITY_SCHEDULING) && (_POSIX_THREAD_PRIORITY_SCHEDULING+0 > 0))\
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|| (defined(_XOPEN_REALTIME) && (_XOPEN_REALTIME+0 >= 0))
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# define BOOST_HAS_SCHED_YIELD
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# endif
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// BOOST_HAS_GETTIMEOFDAY:
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// BOOST_HAS_PTHREAD_MUTEXATTR_SETTYPE:
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// These are predicated on _XOPEN_VERSION, and appears to be first released
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// in issue 4, version 2 (_XOPEN_VERSION > 500).
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// Likewise for the functions log1p and expm1.
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# if defined(_XOPEN_VERSION) && (_XOPEN_VERSION+0 >= 500)
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# define BOOST_HAS_GETTIMEOFDAY
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# if defined(_XOPEN_SOURCE) && (_XOPEN_SOURCE+0 >= 500)
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# define BOOST_HAS_PTHREAD_MUTEXATTR_SETTYPE
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# endif
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# ifndef BOOST_HAS_LOG1P
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# define BOOST_HAS_LOG1P
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# endif
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# ifndef BOOST_HAS_EXPM1
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# define BOOST_HAS_EXPM1
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# endif
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# endif
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# endif
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