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gcc/libstdc++-v3/include/std/version
Jonathan Wakely 74d14778e7 libstdc++: Define std::__is_constant_evaluated() for internal use 
This adds std::__is_constant_evaluated() as a C++11 wrapper for
__builtin_is_constant_evaluated, but just returning false if the
built-in isn't supported by the compiler. This allows us to use it
throughout the library without checking __has_builtin every time.

Some uses in std::vector and std::string can only be constexpr when the
std::is_constant_evaluated() function actually works, so we might as
well guard them with a relevant macro and call that function directly,
rather than the built-in or std::__is_constant_evaluated().

The remaining checks of the __cpp_lib_is_constant_evaluated macro could
now be replaced by checking __cplusplus >= 202002 instead, but there's
no practical difference. We still need some kind of preprocessor check
there anyway.

libstdc++-v3/ChangeLog:

	* doc/doxygen/user.cfg.in (PREDEFINED): Change macro name.
	* include/bits/allocator.h (allocate, deallocate): Use
	std::__is_constant_evaluated() unconditionally, instead of
	checking whether std::is_constant_evaluated() (or the built-in)
	can be used.
	* include/bits/basic_string.h: Check new macro. call
	std::is_constant_evaluated() directly in C++20-only code that is
	guarded by a suitable macro.
	* include/bits/basic_string.tcc: Likewise.
	* include/bits/c++config (__is_constant_evaluated): Define.
	(_GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED): Replace with ...
	(_GLIBCXX_HAVE_IS_CONSTANT_EVALUATED): New macro.
	* include/bits/char_traits.h (char_traits): Replace conditional
	calls to std::is_constant_evaluated with unconditional calls to
	std::__is_constant_evaluated.
	* include/bits/cow_string.h: Use new macro.
	* include/bits/ranges_algobase.h (__copy_or_move): Replace
	conditional calls to std::is_constant_evaluated with unconditional
	calls to std::__is_constant_evaluated.
	(__copy_or_move_backward, __fill_n_fn): Likewise.
	* include/bits/ranges_cmp.h (ranges::less): Likewise.
	* include/bits/stl_algobase.h (lexicographical_compare_three_way):
	Likewise.
	* include/bits/stl_bvector.h: Call std::is_constant_evaluated
	directly in C++20-only code that is guarded by a suitable macro.
	* include/bits/stl_construct.h (_Construct, _Destroy, _Destroy_n):
	Replace is_constant_evaluated with __is_constant_evaluated.
	* include/bits/stl_function.h (greater, less, greater_equal)
	(less_equal): Replace __builtin_is_constant_evaluated and
	__builtin_constant_p with __is_constant_evaluated.
	* include/bits/stl_vector.h: Call std::is_constant_evaluated()
	in C++20-only code.
	* include/debug/helper_functions.h (__check_singular): Use
	__is_constant_evaluated instead of built-in, or remove check
	entirely.
	* include/std/array (operator<=>): Use __is_constant_evaluated
	unconditionally.
	* include/std/bit (__bit_ceil): Likewise.
	* include/std/type_traits (is_constant_evaluated): Define using
	'if consteval' if possible.
	* include/std/version: Use new macro.
	* libsupc++/compare: Use __is_constant_evaluated instead of
	__builtin_is_constant_evaluated.
	* testsuite/23_containers/array/tuple_interface/get_neg.cc:
	Adjust dg-error lines.
2021-12-01 15:00:33 +00:00

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// -*- C++ -*- Libstdc++ version details header.
// Copyright (C) 2018-2021 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 201304L
#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
# if _GLIBCXX_HAVE_IS_CONSTANT_EVALUATED
# define __cpp_lib_constexpr_char_traits 201611L
# define __cpp_lib_constexpr_string 201611L
# endif
#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
#ifdef __GCC_DESTRUCTIVE_SIZE
# define __cpp_lib_hardware_interference_size 201703L
#endif
#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
#ifdef _GLIBCXX_HAS_GTHREADS
# define __cpp_lib_memory_resource 201603L
#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
#if __cplusplus == 201703L // N.B. updated value in C++20
# define __cpp_lib_optional 201606L
#endif
#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
#if _GLIBCXX_HAVE_USELOCALE
# define __cpp_lib_to_chars 201611L
#endif
#define __cpp_lib_unordered_map_try_emplace 201411
#if __cplusplus == 201703L || ! __cpp_concepts // N.B. updated value in C++20
# define __cpp_lib_variant 202102L
#endif
#endif
#if __cplusplus >= 202002L
// c++20
#define __cpp_lib_atomic_flag_test 201907L
#define __cpp_lib_atomic_float 201711L
#define __cpp_lib_atomic_ref 201806L
#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
#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_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
#if defined _GLIBCXX_HAS_GTHREADS || defined _GLIBCXX_HAVE_LINUX_FUTEX
# define __cpp_lib_atomic_wait 201907L
# if __cpp_aligned_new
# define __cpp_lib_barrier 201907L
# endif
#endif
#define __cpp_lib_bind_front 201907L
#if __has_builtin(__builtin_bit_cast)
# define __cpp_lib_bit_cast 201806L
#endif
// FIXME: #define __cpp_lib_execution 201902L
#define __cpp_lib_integer_comparison_functions 202002L
#define __cpp_lib_constexpr_algorithms 201806L
#ifdef __cpp_lib_is_constant_evaluated
# define __cpp_lib_constexpr_char_traits 201811L
#endif
#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
#ifdef __cpp_lib_is_constant_evaluated
# if _GLIBCXX_USE_CXX11_ABI
# define __cpp_lib_constexpr_string 201907L
# else
# define __cpp_lib_constexpr_string 201811L
# endif
#endif
#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_generic_unordered_lookup 201811L
#define __cpp_lib_interpolate 201902L
#ifdef _GLIBCXX_HAS_GTHREADS
# define __cpp_lib_jthread 201911L
#endif
#if __has_builtin(__is_layout_compatible) \
&& __has_builtin(__builtin_is_corresponding_member)
# define __cpp_lib_is_layout_compatible 201907L
#endif
#if __has_builtin(__is_pointer_interconvertible_base_of) \
&& __has_builtin(__builtin_is_pointer_interconvertible_with_class)
# define __cpp_lib_is_pointer_interconvertible 201907L
#endif
#if __cpp_lib_atomic_wait
# define __cpp_lib_latch 201907L
#endif
#define __cpp_lib_list_remove_return_type 201806L
#if __cpp_lib_concepts
# define __cpp_lib_make_obj_using_allocator 201811L
#endif
#define __cpp_lib_math_constants 201907L
#define __cpp_lib_optional 202106L
#define __cpp_lib_polymorphic_allocator 201902L
#if __cpp_lib_concepts
# define __cpp_lib_ranges 202106L
#endif
#if __cpp_lib_atomic_wait || _GLIBCXX_HAVE_POSIX_SEMAPHORE
# define __cpp_lib_semaphore 201907L
#endif
#define __cpp_lib_shift 201806L
#if __has_builtin(__builtin_source_location)
# define __cpp_lib_source_location 201907L
#endif
#if __cpp_lib_concepts
# define __cpp_lib_span 202002L
#endif
#define __cpp_lib_ssize 201902L
#define __cpp_lib_starts_ends_with 201711L
# if _GLIBCXX_USE_CXX11_ABI
// Only supported with cxx11-abi
# define __cpp_lib_syncbuf 201803L
# endif
#define __cpp_lib_to_address 201711L
#define __cpp_lib_to_array 201907L
#if __cpp_concepts
# define __cpp_lib_variant 202106L
#endif
#endif
#if __cplusplus > 202002L
// c++2b
#define __cpp_lib_adaptor_iterator_pair_constructor 202106L
#define __cpp_lib_byteswap 202110L
#define __cpp_lib_invoke_r 202106L
#define __cpp_lib_is_scoped_enum 202011L
#if __cpp_lib_concepts
# define __cpp_lib_monadic_optional 202110L
#endif
#define __cpp_lib_move_only_function 202110L
#if __cpp_lib_span
# define __cpp_lib_spanstream 202106L
#endif
#define __cpp_lib_string_contains 202011L
#if _GLIBCXX_USE_CXX11_ABI // Only supported with cxx11-abi
# define __cpp_lib_string_resize_and_overwrite 202110L
#endif
#define __cpp_lib_to_underlying 202102L
#endif // C++2b
#endif // C++20
#endif // C++17
#endif // C++14
#endif // C++11
#endif // _GLIBCXX_VERSION_INCLUDED
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