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// -*- C++ -*- Libstdc++ version details header.
// Copyright (C) 2018-2020 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @file version
* This is a Standard C++ Library file. You should @c \#include this file
* in your programs, rather than any of the @a *.h implementation files.
*/
#ifndef _GLIBCXX_VERSION_INCLUDED
#define _GLIBCXX_VERSION_INCLUDED
#pragma GCC system_header
#include <bits/c++config.h>
// c++03
#if _GLIBCXX_HOSTED
# define __cpp_lib_incomplete_container_elements 201505
#endif
#if !defined(__STRICT_ANSI__)
// gnu++03
# define __cpp_lib_uncaught_exceptions 201411L
#endif
#if __cplusplus >= 201103L
// c++11
#define __cpp_lib_is_null_pointer 201309
#define __cpp_lib_result_of_sfinae 201210
#if _GLIBCXX_HOSTED
# define __cpp_lib_allocator_traits_is_always_equal 201411
# define __cpp_lib_shared_ptr_arrays 201611L
#endif
#if !defined(__STRICT_ANSI__)
// gnu++11
# define __cpp_lib_is_swappable 201603
# define __cpp_lib_void_t 201411
# if _GLIBCXX_HOSTED
# define __cpp_lib_enable_shared_from_this 201603
# endif
#endif
// For C++11 and later we support ISO/IEC 29124 Mathematical Special Functions
#define __STDCPP_MATH_SPEC_FUNCS__ 201003L
#if __cplusplus >= 201402L
// c++14
#if __cpp_impl_coroutine
# define __cpp_lib_coroutine 201902L
#endif
#define __cpp_lib_integral_constant_callable 201304
#define __cpp_lib_is_final 201402L
#define __cpp_lib_transformation_trait_aliases 201304
#if _GLIBCXX_HOSTED
# define __cpp_lib_chrono_udls 201304
# define __cpp_lib_complex_udls 201309
# define __cpp_lib_exchange_function 201304
# define __cpp_lib_generic_associative_lookup 201304
# define __cpp_lib_integer_sequence 201304
# define __cpp_lib_make_reverse_iterator 201402
# define __cpp_lib_make_unique 201304
# ifndef _GLIBCXX_DEBUG // PR libstdc++/70303
# define __cpp_lib_null_iterators 201304L
# endif
# define __cpp_lib_quoted_string_io 201304
# define __cpp_lib_robust_nonmodifying_seq_ops 201304
# ifdef _GLIBCXX_HAS_GTHREADS
# define __cpp_lib_shared_timed_mutex 201402L
# endif
# define __cpp_lib_string_udls 201304
# define __cpp_lib_transparent_operators 201510
# define __cpp_lib_tuple_element_t 201402L
# define __cpp_lib_tuples_by_type 201304
#endif
#if __cplusplus >= 201703L
// c++17
#define __cpp_lib_addressof_constexpr 201603
#define __cpp_lib_atomic_is_always_lock_free 201603
#define __cpp_lib_bool_constant 201505
#define __cpp_lib_byte 201603
#ifdef _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP
# define __cpp_lib_has_unique_object_representations 201606
#endif
#ifdef _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE
# define __cpp_lib_is_aggregate 201703
#endif
#define __cpp_lib_is_invocable 201703
#define __cpp_lib_is_swappable 201603
#ifdef _GLIBCXX_HAVE_BUILTIN_LAUNDER
# define __cpp_lib_launder 201606
#endif
#define __cpp_lib_logical_traits 201510
#define __cpp_lib_type_trait_variable_templates 201510L
#define __cpp_lib_uncaught_exceptions 201411L
#define __cpp_lib_void_t 201411
#if _GLIBCXX_HOSTED
#define __cpp_lib_any 201606L
#define __cpp_lib_apply 201603
#if __cplusplus == 201703L // N.B. updated value in C++20
# define __cpp_lib_array_constexpr 201803L
#endif
#define __cpp_lib_as_const 201510
#define __cpp_lib_boyer_moore_searcher 201603
#define __cpp_lib_chrono 201611
#define __cpp_lib_clamp 201603
#if __cplusplus == 201703L // N.B. updated value in C++20
# define __cpp_lib_constexpr_char_traits 201611L
#endif
#define __cpp_lib_enable_shared_from_this 201603
#define __cpp_lib_execution 201902L // FIXME: should be 201603L
#define __cpp_lib_filesystem 201703
#define __cpp_lib_gcd 201606
#define __cpp_lib_gcd_lcm 201606
#define __cpp_lib_hypot 201603
#define __cpp_lib_invoke 201411L
#define __cpp_lib_lcm 201606
#define __cpp_lib_make_from_tuple 201606
#define __cpp_lib_map_try_emplace 201411
#define __cpp_lib_math_special_functions 201603L
Implement std::pmr::synchronized_pool_resource Define the thread-safe pool resource, using a shared_mutex to allow multiple threads to concurrently allocate from thread-specific pools. Define new weak symbols for the pthread_rwlock_t functions, to avoid making libstdc++.so depend on libpthread.so When the necessary Gthread support is absent only define the feature-test macro to 1, rather than 201603. This is intended to imply incomplete support, because everything except synchronized_pool_resource works. Implement std::pmr::synchronized_pool_resource * config/abi/pre/gnu.ver: Add new symbols. * include/std/memory_resource [_GLIBCXX_HAS_GTHREADS] (__cpp_lib_memory_resource): Define to expected value, 201603. (synchronized_pool_resource): New class. [!_GLIBCXX_HAS_GTHREADS] (__cpp_lib_memory_resource): Define to 1. * include/std/shared_mutex (__glibcxx_rwlock_rdlock) (__glibcxx_rwlock_tryrdlock, __glibcxx_rwlock_wrlock) (__glibcxx_rwlock_trywrlock, __glibcxx_rwlock_unlock) (__glibcxx_rwlock_destroy, __glibcxx_rwlock_init) (__glibcxx_rwlock_timedrdlock, __glibcxx_rwlock_timedwrlock): Define weak symbols for POSIX rwlock functions. (__shared_mutex_pthread): Use weak symbols. * include/std/version (__cpp_lib_memory_resource): Define. * src/c++17/memory_resource.cc [_GLIBCXX_HAS_GTHREADS] (synchronized_pool_resource::_TPools): New class. (destroy_TPools): New function for pthread_key_create destructor. (synchronized_pool_resource::synchronized_pool_resource) (synchronized_pool_resource::~synchronized_pool_resource) (synchronized_pool_resource::release) (synchronized_pool_resource::do_allocate) (synchronized_pool_resource::do_deallocate): Define public members. (synchronized_pool_resource::_M_thread_specific_pools) (synchronized_pool_resource::_M_alloc_tpools) (synchronized_pool_resource::_M_alloc_shared_tpools): Define private members. * testsuite/20_util/synchronized_pool_resource/allocate.cc: New test. * testsuite/20_util/synchronized_pool_resource/cons.cc: New test. * testsuite/20_util/synchronized_pool_resource/is_equal.cc: New test. * testsuite/20_util/synchronized_pool_resource/multithreaded.cc: New test. * testsuite/20_util/synchronized_pool_resource/release.cc: New test. * testsuite/performance/20_util/memory_resource/pools.cc: Add multithreaded tests using pmr::synchronized_pool_resource. From-SVN: r266242
2018-11-18 00:35:44 +01:00
#ifdef _GLIBCXX_HAS_GTHREADS
libstdc++: Reduce header dependencies in and on <memory> By moving std::make_obj_using_allocator and the related "utility functions for uses-allocator construction" to a new header, we can avoid including the whole of <memory> in <scoped_allocator> and <memory_resource>. In order to simplify the implementation of those utility functions they now use concepts unconditionally. They are no longer defined if __cpp_concepts is not defined. To simplify the code that uses those functions I've introduced a __cpp_lib_make_obj_using_allocator feature test macro (not specified in the standard, which might be an oversight). That allows the code in <memory_resource> and <scoped_allocator> to check the feature test macro to decide whether to use the new utilities, or fall back to the C++17 code. At the same time, this reshuffles some of the headers included by <memory> so that they are (mostly?) self-contained. It should no longer be necessary to include other headers before <bits/shared_ptr.h> when other parts of the library want to use std::shared_ptr without including the whole of <memory>. libstdc++-v3/ChangeLog: * include/Makefile.am: Add new header. * include/Makefile.in: Regenerate. * include/bits/shared_ptr.h: Include <iosfwd>. * include/bits/shared_ptr_base.h: Include required headers here directly, instead of in <memory>. * include/bits/uses_allocator_args.h: New file. Move utility functions for uses-allocator construction from <memory> to here. Only define the utility functions when concepts are available. (__cpp_lib_make_obj_using_allocator): Define non-standard feature test macro. * include/std/condition_variable: Remove unused headers. * include/std/future: Likewise. * include/std/memory: Remove headers that are not needed directly, and are now inclkuded where they're needed. Include new <bits/uses_allocator_args.h> header. * include/std/memory_resource: Include only the necessary headers. Use new feature test macro to detect support for the utility functions. * include/std/scoped_allocator: Likewise. * include/std/version (__cpp_lib_make_obj_using_allocator): Define.
2020-10-22 19:42:03 +02:00
# define __cpp_lib_memory_resource 201603L
Implement std::pmr::synchronized_pool_resource Define the thread-safe pool resource, using a shared_mutex to allow multiple threads to concurrently allocate from thread-specific pools. Define new weak symbols for the pthread_rwlock_t functions, to avoid making libstdc++.so depend on libpthread.so When the necessary Gthread support is absent only define the feature-test macro to 1, rather than 201603. This is intended to imply incomplete support, because everything except synchronized_pool_resource works. Implement std::pmr::synchronized_pool_resource * config/abi/pre/gnu.ver: Add new symbols. * include/std/memory_resource [_GLIBCXX_HAS_GTHREADS] (__cpp_lib_memory_resource): Define to expected value, 201603. (synchronized_pool_resource): New class. [!_GLIBCXX_HAS_GTHREADS] (__cpp_lib_memory_resource): Define to 1. * include/std/shared_mutex (__glibcxx_rwlock_rdlock) (__glibcxx_rwlock_tryrdlock, __glibcxx_rwlock_wrlock) (__glibcxx_rwlock_trywrlock, __glibcxx_rwlock_unlock) (__glibcxx_rwlock_destroy, __glibcxx_rwlock_init) (__glibcxx_rwlock_timedrdlock, __glibcxx_rwlock_timedwrlock): Define weak symbols for POSIX rwlock functions. (__shared_mutex_pthread): Use weak symbols. * include/std/version (__cpp_lib_memory_resource): Define. * src/c++17/memory_resource.cc [_GLIBCXX_HAS_GTHREADS] (synchronized_pool_resource::_TPools): New class. (destroy_TPools): New function for pthread_key_create destructor. (synchronized_pool_resource::synchronized_pool_resource) (synchronized_pool_resource::~synchronized_pool_resource) (synchronized_pool_resource::release) (synchronized_pool_resource::do_allocate) (synchronized_pool_resource::do_deallocate): Define public members. (synchronized_pool_resource::_M_thread_specific_pools) (synchronized_pool_resource::_M_alloc_tpools) (synchronized_pool_resource::_M_alloc_shared_tpools): Define private members. * testsuite/20_util/synchronized_pool_resource/allocate.cc: New test. * testsuite/20_util/synchronized_pool_resource/cons.cc: New test. * testsuite/20_util/synchronized_pool_resource/is_equal.cc: New test. * testsuite/20_util/synchronized_pool_resource/multithreaded.cc: New test. * testsuite/20_util/synchronized_pool_resource/release.cc: New test. * testsuite/performance/20_util/memory_resource/pools.cc: Add multithreaded tests using pmr::synchronized_pool_resource. From-SVN: r266242
2018-11-18 00:35:44 +01:00
#else
# define __cpp_lib_memory_resource 1
#endif
#define __cpp_lib_node_extract 201606
#define __cpp_lib_nonmember_container_access 201411
#define __cpp_lib_not_fn 201603
#define __cpp_lib_optional 201606L
#define __cpp_lib_parallel_algorithm 201603L
#define __cpp_lib_raw_memory_algorithms 201606L
#define __cpp_lib_sample 201603
#ifdef _GLIBCXX_HAS_GTHREADS
# define __cpp_lib_scoped_lock 201703
# define __cpp_lib_shared_mutex 201505L
#endif
#define __cpp_lib_shared_ptr_weak_type 201606
#define __cpp_lib_string_view 201803L
Replace std::to_string for integers with optimized version The std::to_chars functions from C++17 can be used to implement std::to_string with much better performance than calling snprintf. Only the __detail::__to_chars_len and __detail::__to_chars_10 functions are needed for to_string, because it always outputs base 10 representations. The return type of __detail::__to_chars_10 should not be declared before C++17, so the function body is extracted into a new function that can be reused by to_string and __detail::__to_chars_10. The existing tests for to_chars rely on to_string to check for correct answers. Now that they use the same code that doesn't actually ensure correctness, so add new tests for std::to_string that compare against printf output. * include/Makefile.am: Add new <bits/charconv.h> header. * include/Makefile.in: Regenerate. * include/bits/basic_string.h (to_string(int), to_string(unsigned)) (to_string(long), to_string(unsigned long), to_string(long long)) (to_string(unsigned long long)): Rewrite to use __to_chars_10_impl. * include/bits/charconv.h: New header. (__detail::__to_chars_len): Move here from <charconv>. (__detail::__to_chars_10_impl): New function extracted from __detail::__to_chars_10. * include/std/charconv (__cpp_lib_to_chars): Add, but comment out. (__to_chars_unsigned_type): New class template that reuses __make_unsigned_selector_base::__select to pick a type. (__unsigned_least_t): Redefine as __to_chars_unsigned_type<T>::type. (__detail::__to_chars_len): Move to new header. (__detail::__to_chars_10): Add inline specifier. Move code doing the output to __detail::__to_chars_10_impl and call that. * include/std/version (__cpp_lib_to_chars): Add, but comment out. * testsuite/21_strings/basic_string/numeric_conversions/char/ to_string.cc: Fix reference in comment. Remove unused variable. * testsuite/21_strings/basic_string/numeric_conversions/char/ to_string_int.cc: New test. From-SVN: r272186
2019-06-12 16:52:02 +02:00
// #define __cpp_lib_to_chars 201611L
#define __cpp_lib_unordered_map_try_emplace 201411
#define __cpp_lib_variant 201606L
#endif
#if __cplusplus > 201703L
// c++2a
#define __cpp_lib_atomic_flag_test 201907L
#define __cpp_lib_atomic_float 201711L
#define __cpp_lib_atomic_ref 201806L
libstdc++: Value-initialize std::atomic for C++20 (P0883R2) This implements the new requirements for C++20 that std::atomic should initialize the atomic variable in its default constructor. This patch does not add the deprecated attribute to atomic_init, but that should be done at some point as it's deprecated in C++20. The paper also deprecates the ATOMIC_FLAG_INIT macro, although we can't apply the deprecated attribute to a macro. PR libstdc++/58605 * include/bits/atomic_base.h (__cpp_lib_atomic_value_initialization): Define. (__atomic_flag_base, __atomic_base, __atomic_base<_PTp*>) (__atomic_float): Add default member initializer for C++20. * include/std/atomic (atomic): Likewise. (atomic::atomic()): Remove noexcept-specifier on default constructor. * include/std/version (__cpp_lib_atomic_value_initialization): Define. * testsuite/29_atomics/atomic/cons/assign_neg.cc: Adjust dg-error line number. * testsuite/29_atomics/atomic/cons/copy_neg.cc: Likewise. * testsuite/29_atomics/atomic/cons/value_init.cc: New test. * testsuite/29_atomics/atomic_flag/cons/value_init.cc: New test. * testsuite/29_atomics/atomic_flag/requirements/trivial.cc: Adjust expected result for is_trivially_default_constructible. * testsuite/29_atomics/atomic_float/requirements.cc: Likewise. * testsuite/29_atomics/atomic_float/value_init.cc: New test. * testsuite/29_atomics/atomic_integral/cons/assign_neg.cc: Likewise. * testsuite/29_atomics/atomic_integral/cons/copy_neg.cc: Likewise. * testsuite/29_atomics/atomic_integral/cons/value_init.cc * testsuite/29_atomics/atomic_integral/requirements/trivial.cc: Adjust expected results for is_trivially_default_constructible. * testsuite/util/testsuite_common_types.h (has_trivial_dtor): Add new test generator.
2020-01-11 01:11:54 +01:00
#define __cpp_lib_atomic_value_initialization 201911L
#define __cpp_lib_bitops 201907L
#define __cpp_lib_bounded_array_traits 201902L
// __cpp_lib_char8_t is defined in <bits/c++config.h>
#if __cpp_concepts >= 201907L
# define __cpp_lib_concepts 202002L
Implement <concepts> header for C++20 There are currently no tests for [concepts.compare], but they will be added ASAP. * include/Makefile.am: Add new header. * include/Makefile.in: Regenerate. * include/precompiled/stdc++.h: Include <concepts>. * include/std/concepts: New header for C++20. * include/std/version (__cpp_lib_concepts): Define. * scripts/create_testsuite_files: Look for test files in new std directory. * testsuite/libstdc++-dg/conformance.exp: Likewise. * testsuite/std/concepts/concepts.callable/invocable.cc: New test. * testsuite/std/concepts/concepts.callable/regular_invocable.cc: New test. * testsuite/std/concepts/concepts.callable/relation.cc: New test. * testsuite/std/concepts/concepts.callable/strictweakorder.cc: New test. * testsuite/std/concepts/concepts.lang/concept.arithmetic/ floating_point.cc: New test. * testsuite/std/concepts/concepts.lang/concept.arithmetic/integral.cc: New test. * testsuite/std/concepts/concepts.lang/concept.arithmetic/ signed_integral.cc: New test. * testsuite/std/concepts/concepts.lang/concept.arithmetic/ unsigned_integral.cc: New test. * testsuite/std/concepts/concepts.lang/concept.assignable/1.cc: New test. * testsuite/std/concepts/concepts.lang/concept.common/1.cc: New test. * testsuite/std/concepts/concepts.lang/concept.commonref/1.cc: New test. * testsuite/std/concepts/concepts.lang/concept.constructible/1.cc: New test. * testsuite/std/concepts/concepts.lang/concept.convertible/1.cc: New test. * testsuite/std/concepts/concepts.lang/concept.copyconstructible/1.cc: New test. * testsuite/std/concepts/concepts.lang/concept.defaultconstructible/ 1.cc: New test. * testsuite/std/concepts/concepts.lang/concept.derived/1.cc: New test. * testsuite/std/concepts/concepts.lang/concept.destructible/1.cc: New test. * testsuite/std/concepts/concepts.lang/concept.moveconstructible/1.cc: New test. * testsuite/std/concepts/concepts.lang/concept.same/1.cc: New test. * testsuite/std/concepts/concepts.lang/concept.swappable/swap.cc: New test. * testsuite/std/concepts/concepts.lang/concept.swappable/swappable.cc: New test. * testsuite/std/concepts/concepts.lang/concept.swappable/ swappable_with.cc: New test. * testsuite/std/concepts/concepts.object/copyable.cc: New test. * testsuite/std/concepts/concepts.object/movable.cc: New test. * testsuite/std/concepts/concepts.object/regular.cc: New test. * testsuite/std/concepts/concepts.object/semiregular.cc: New test. From-SVN: r276892
2019-10-11 17:53:52 +02:00
#endif
#if __cpp_impl_destroying_delete
# define __cpp_lib_destroying_delete 201806L
#endif
#define __cpp_lib_endian 201907L
#define __cpp_lib_int_pow2 202002L
#ifdef _GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED
# define __cpp_lib_is_constant_evaluated 201811L
#endif
#define __cpp_lib_is_nothrow_convertible 201806L
#define __cpp_lib_remove_cvref 201711L
#if __cpp_impl_three_way_comparison >= 201907L && __cpp_lib_concepts
# define __cpp_lib_three_way_comparison 201907L
#endif
#define __cpp_lib_type_identity 201806L
#define __cpp_lib_unwrap_ref 201811L
#if _GLIBCXX_HOSTED
#define __cpp_lib_array_constexpr 201811L
#define __cpp_lib_assume_aligned 201811L
#define __cpp_lib_bind_front 201907L
// FIXME: #define __cpp_lib_execution 201902L
#define __cpp_lib_integer_comparison_functions 202002L
#define __cpp_lib_constexpr_algorithms 201806L
#define __cpp_lib_constexpr_char_traits 201811L
#define __cpp_lib_constexpr_complex 201711L
#define __cpp_lib_constexpr_dynamic_alloc 201907L
#define __cpp_lib_constexpr_functional 201907L
#define __cpp_lib_constexpr_iterator 201811L
#define __cpp_lib_constexpr_memory 201811L
#define __cpp_lib_constexpr_numeric 201911L
#define __cpp_lib_constexpr_string_view 201811L
#define __cpp_lib_constexpr_tuple 201811L
#define __cpp_lib_constexpr_utility 201811L
#define __cpp_lib_erase_if 202002L
#define __cpp_lib_interpolate 201902L
#ifdef _GLIBCXX_HAS_GTHREADS
# define __cpp_lib_jthread 201911L
#endif
#define __cpp_lib_list_remove_return_type 201806L
libstdc++: Reduce header dependencies in and on <memory> By moving std::make_obj_using_allocator and the related "utility functions for uses-allocator construction" to a new header, we can avoid including the whole of <memory> in <scoped_allocator> and <memory_resource>. In order to simplify the implementation of those utility functions they now use concepts unconditionally. They are no longer defined if __cpp_concepts is not defined. To simplify the code that uses those functions I've introduced a __cpp_lib_make_obj_using_allocator feature test macro (not specified in the standard, which might be an oversight). That allows the code in <memory_resource> and <scoped_allocator> to check the feature test macro to decide whether to use the new utilities, or fall back to the C++17 code. At the same time, this reshuffles some of the headers included by <memory> so that they are (mostly?) self-contained. It should no longer be necessary to include other headers before <bits/shared_ptr.h> when other parts of the library want to use std::shared_ptr without including the whole of <memory>. libstdc++-v3/ChangeLog: * include/Makefile.am: Add new header. * include/Makefile.in: Regenerate. * include/bits/shared_ptr.h: Include <iosfwd>. * include/bits/shared_ptr_base.h: Include required headers here directly, instead of in <memory>. * include/bits/uses_allocator_args.h: New file. Move utility functions for uses-allocator construction from <memory> to here. Only define the utility functions when concepts are available. (__cpp_lib_make_obj_using_allocator): Define non-standard feature test macro. * include/std/condition_variable: Remove unused headers. * include/std/future: Likewise. * include/std/memory: Remove headers that are not needed directly, and are now inclkuded where they're needed. Include new <bits/uses_allocator_args.h> header. * include/std/memory_resource: Include only the necessary headers. Use new feature test macro to detect support for the utility functions. * include/std/scoped_allocator: Likewise. * include/std/version (__cpp_lib_make_obj_using_allocator): Define.
2020-10-22 19:42:03 +02:00
#if __cpp_lib_concepts
# define __cpp_lib_make_obj_using_allocator 201811L
#endif
#define __cpp_lib_math_constants 201907L
#define __cpp_lib_polymorphic_allocator 201902L
#if __cpp_lib_concepts
# define __cpp_lib_ranges 201911L
#endif
#define __cpp_lib_shift 201806L
#define __cpp_lib_span 202002L
#define __cpp_lib_ssize 201902L
#define __cpp_lib_starts_ends_with 201711L
# if _GLIBCXX_USE_CXX11_ABI
// Only supported with cx11-abi
# define __cpp_lib_syncbuf 201803L
# endif
#define __cpp_lib_to_address 201711L
#define __cpp_lib_to_array 201907L
#endif
#endif // C++2a
#endif // C++17
#endif // C++14
#endif // C++11
#endif // _GLIBCXX_VERSION_INCLUDED