Revert "Microsoft's floating-point to_chars powered by Ryu and Ryu Pr…

…intf" This reverts commit a8025e0 since it triggers PR52584 with debug info enabled.
kraj · Dec 7, 2021 · ae53d02 · ae53d02
1 parent 2ccab2e
commit ae53d02
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diff --git a/libcxx/CREDITS.TXT b/libcxx/CREDITS.TXT
@@ -12,9 +12,6 @@ N: Saleem Abdulrasool
 E: compnerd@compnerd.org
 D: Minor patches and Linux fixes.
 
-N: Ulf Adams
-D: Invented the Ryu and Ryu Printf algorithms used in floating-point to_chars, and wrote the initial code.
-
 N: Muiez Ahmed
 E: muiez@ibm.com
 D: z/OS port.
@@ -31,9 +28,6 @@ N: Holger Arnold
 E: holgerar@gmail.com
 D: Minor fix.
 
-N: Jorg Brown
-D: Ported floating-point to_chars from MSVC to libc++.
-
 N: David Chisnall
 E: theraven at theravensnest dot org
 D: FreeBSD and Solaris ports, libcxxrt support, some atomics work.
@@ -87,14 +81,6 @@ N: Argyrios Kyrtzidis
 E: kyrtzidis@apple.com
 D: Bug fixes.
 
-N: Stephan T. Lavavej
-E: stl@microsoft.com
-E: stl@nuwen.net
-D: Implemented floating-point to_chars.
-
-N: Microsoft Corporation
-D: Contributed floating-point to_chars.
-
 N: Bruce Mitchener, Jr.
 E: bruce.mitchener@gmail.com
 D: Emscripten-related changes.
@@ -166,7 +152,6 @@ D: Minor bug fix.
 N: Mark de Wever
 E: koraq at xs4all dot nl
 D: Format library support.
-D: Finalized the porting of MSVC's to_chars to libc++.
 
 N: Zhang Xiongpang
 E: zhangxiongpang@gmail.com

diff --git a/libcxx/docs/ReleaseNotes.rst b/libcxx/docs/ReleaseNotes.rst
@@ -55,10 +55,6 @@ New Features
   behavior of standard algorithms (e.g. equal elements in ``std::sort`` or
   randomization of both sides of partition for ``std::nth_element``)
 
-- Floating-point support for ``std::to_chars`` support has been added.
-  Thanks to Stephan T. Lavavej and Microsoft for providing their implemention
-  to libc++.
-
 API Changes
 -----------
 

diff --git a/libcxx/docs/Status/Cxx17.rst b/libcxx/docs/Status/Cxx17.rst
@@ -40,7 +40,6 @@ Paper Status
 
 .. note::
 
-   .. [#note-P0067] P0067: ``std::(to|from)_chars`` for integrals has been available since version 7.0. ``std::to_chars`` for ``float`` and ``double`` since version 14.0 ``std::to_chars`` for ``long double`` uses the implementation for ``double``.
    .. [#note-P0607] P0607: The parts of P0607 that are not done are the ``<regex>`` bits.
 
 

diff --git a/libcxx/docs/Status/Cxx17Papers.csv b/libcxx/docs/Status/Cxx17Papers.csv
@@ -71,7 +71,7 @@
 "`P0394r4 <https://wg21.link/P0394r4>`__","LWG","Hotel Parallelifornia: terminate() for Parallel Algorithms Exception Handling","Oulu","",""
 "","","","","",""
 "`P0003R5 <https://wg21.link/P0003R5>`__","LWG","Removing Deprecated Exception Specifications from C++17","Issaquah","|Complete|","5.0"
-"`P0067R5 <https://wg21.link/P0067R5>`__","LWG","Elementary string conversions, revision 5","Issaquah","|Partial| [#note-P0067]",""
+"`P0067R5 <https://wg21.link/P0067R5>`__","LWG","Elementary string conversions, revision 5","Issaquah","|Partial|",""
 "`P0403R1 <https://wg21.link/P0403R1>`__","LWG","Literal suffixes for ``basic_string_view``\ ","Issaquah","|Complete|","4.0"
 "`P0414R2 <https://wg21.link/P0414R2>`__","LWG","Merging shared_ptr changes from Library Fundamentals to C++17","Issaquah","|Complete|","11.0"
 "`P0418R2 <https://wg21.link/P0418R2>`__","LWG","Fail or succeed: there is no atomic lattice","Issaquah","",""

diff --git a/libcxx/include/__availability b/libcxx/include/__availability
@@ -129,10 +129,6 @@
     // This controls the availability of std::to_chars.
 #   define _LIBCPP_AVAILABILITY_TO_CHARS
 
-    // This controls the availability of floating-point std::to_chars functions.
-    // These overloads were added later than the integer overloads.
-#   define _LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT
-
     // This controls the availability of the C++20 synchronization library,
     // which requires shared library support for various operations
     // (see libcxx/src/atomic.cpp).
@@ -226,9 +222,6 @@
 #   define _LIBCPP_AVAILABILITY_TO_CHARS                                        \
         _LIBCPP_AVAILABILITY_FILESYSTEM
 
-#   define _LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT                         \
-        __attribute__((unavailable))
-
 #   define _LIBCPP_AVAILABILITY_SYNC                                            \
         __attribute__((availability(macosx,strict,introduced=11.0)))            \
         __attribute__((availability(ios,strict,introduced=14.0)))               \

diff --git a/libcxx/include/charconv b/libcxx/include/charconv
@@ -598,38 +598,6 @@ from_chars(const char* __first, const char* __last, _Tp& __value, int __base)
     return __from_chars_integral(__first, __last, __value, __base);
 }
 
-// Floating-point implementation starts here.
-// Unlike the other parts of charconv this is only available in C++17 and newer.
-#if _LIBCPP_STD_VER > 14
-
-_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS
-to_chars_result to_chars(char* __first, char* __last, float __value);
-
-_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS
-to_chars_result to_chars(char* __first, char* __last, double __value);
-
-_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS
-to_chars_result to_chars(char* __first, char* __last, long double __value);
-
-_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS
-to_chars_result to_chars(char* __first, char* __last, float __value, chars_format __fmt);
-
-_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS
-to_chars_result to_chars(char* __first, char* __last, double __value, chars_format __fmt);
-
-_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS
-to_chars_result to_chars(char* __first, char* __last, long double __value, chars_format __fmt);
-
-_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS
-to_chars_result to_chars(char* __first, char* __last, float __value, chars_format __fmt, int __precision);
-
-_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS
-to_chars_result to_chars(char* __first, char* __last, double __value, chars_format __fmt, int __precision);
-
-_LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_FUNC_VIS
-to_chars_result to_chars(char* __first, char* __last, long double __value, chars_format __fmt, int __precision);
-
-#  endif // _LIBCPP_STD_VER > 14
 #endif // _LIBCPP_CXX03_LANG
 
 _LIBCPP_END_NAMESPACE_STD

diff --git a/libcxx/lib/abi/CHANGELOG.TXT b/libcxx/lib/abi/CHANGELOG.TXT
@@ -16,48 +16,6 @@ New entries should be added directly below the "Version" header.
 Version 14.0
 ------------
 
-* [libc++] `to_chars` for floating point.
-
-  This commit added the `to_chars` implementation for floating point values.
-  The entire implementation resides in the dylib and the functions specified
-  in the Standard are now part of the ABI.
-
-  arm64-apple-darwin
-  ------------------
-  Symbol added: _ZNSt3__18to_charsEPcS0_d
-  Symbol added: _ZNSt3__18to_charsEPcS0_dNS_12chars_formatE
-  Symbol added: _ZNSt3__18to_charsEPcS0_dNS_12chars_formatEi
-  Symbol added: _ZNSt3__18to_charsEPcS0_e
-  Symbol added: _ZNSt3__18to_charsEPcS0_eNS_12chars_formatE
-  Symbol added: _ZNSt3__18to_charsEPcS0_eNS_12chars_formatEi
-  Symbol added: _ZNSt3__18to_charsEPcS0_f
-  Symbol added: _ZNSt3__18to_charsEPcS0_fNS_12chars_formatE
-  Symbol added: _ZNSt3__18to_charsEPcS0_fNS_12chars_formatEi
-
-  x86_64-apple-darwin
-  -------------------
-  Symbol added: _ZNSt3__18to_charsEPcS0_d
-  Symbol added: _ZNSt3__18to_charsEPcS0_dNS_12chars_formatE
-  Symbol added: _ZNSt3__18to_charsEPcS0_dNS_12chars_formatEi
-  Symbol added: _ZNSt3__18to_charsEPcS0_e
-  Symbol added: _ZNSt3__18to_charsEPcS0_eNS_12chars_formatE
-  Symbol added: _ZNSt3__18to_charsEPcS0_eNS_12chars_formatEi
-  Symbol added: _ZNSt3__18to_charsEPcS0_f
-  Symbol added: _ZNSt3__18to_charsEPcS0_fNS_12chars_formatE
-  Symbol added: _ZNSt3__18to_charsEPcS0_fNS_12chars_formatEi
-
-  x86_64-unknown-linux-gnu
-  ------------------------
-  Symbol added: _ZNSt3__18to_charsEPcS0_d
-  Symbol added: _ZNSt3__18to_charsEPcS0_dNS_12chars_formatE
-  Symbol added: _ZNSt3__18to_charsEPcS0_dNS_12chars_formatEi
-  Symbol added: _ZNSt3__18to_charsEPcS0_e
-  Symbol added: _ZNSt3__18to_charsEPcS0_eNS_12chars_formatE
-  Symbol added: _ZNSt3__18to_charsEPcS0_eNS_12chars_formatEi
-  Symbol added: _ZNSt3__18to_charsEPcS0_f
-  Symbol added: _ZNSt3__18to_charsEPcS0_fNS_12chars_formatE
-  Symbol added: _ZNSt3__18to_charsEPcS0_fNS_12chars_formatEi
-
 * [libc++] Resolve missing table_size symbol
 
   This commit added an out-of-line definition for `table_size` in the library.

diff --git a/libcxx/lib/abi/arm64-apple-darwin.libcxxabi.v1.stable.exceptions.no_new_in_libcxx.abilist b/libcxx/lib/abi/arm64-apple-darwin.libcxxabi.v1.stable.exceptions.no_new_in_libcxx.abilist
@@ -1879,15 +1879,6 @@
 {'is_defined': True, 'name': '__ZNSt3__18time_getIwNS_19istreambuf_iteratorIwNS_11char_traitsIwEEEEE2idE', 'size': 0, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '__ZNSt3__18time_putIcNS_19ostreambuf_iteratorIcNS_11char_traitsIcEEEEE2idE', 'size': 0, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '__ZNSt3__18time_putIwNS_19ostreambuf_iteratorIwNS_11char_traitsIwEEEEE2idE', 'size': 0, 'type': 'OBJECT'}
-{'is_defined': True, 'name': '__ZNSt3__18to_charsEPcS0_d', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__18to_charsEPcS0_dNS_12chars_formatE', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__18to_charsEPcS0_dNS_12chars_formatEi', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__18to_charsEPcS0_e', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__18to_charsEPcS0_eNS_12chars_formatE', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__18to_charsEPcS0_eNS_12chars_formatEi', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__18to_charsEPcS0_f', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__18to_charsEPcS0_fNS_12chars_formatE', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__18to_charsEPcS0_fNS_12chars_formatEi', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__18valarrayImE6resizeEmm', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__18valarrayImEC1Em', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__18valarrayImEC2Em', 'type': 'FUNC'}

diff --git a/libcxx/lib/abi/x86_64-apple-darwin.libcxxabi.v1.stable.exceptions.no_new_in_libcxx.abilist b/libcxx/lib/abi/x86_64-apple-darwin.libcxxabi.v1.stable.exceptions.no_new_in_libcxx.abilist
@@ -1879,15 +1879,6 @@
 {'is_defined': True, 'name': '__ZNSt3__18time_getIwNS_19istreambuf_iteratorIwNS_11char_traitsIwEEEEE2idE', 'size': 0, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '__ZNSt3__18time_putIcNS_19ostreambuf_iteratorIcNS_11char_traitsIcEEEEE2idE', 'size': 0, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '__ZNSt3__18time_putIwNS_19ostreambuf_iteratorIwNS_11char_traitsIwEEEEE2idE', 'size': 0, 'type': 'OBJECT'}
-{'is_defined': True, 'name': '__ZNSt3__18to_charsEPcS0_d', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__18to_charsEPcS0_dNS_12chars_formatE', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__18to_charsEPcS0_dNS_12chars_formatEi', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__18to_charsEPcS0_e', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__18to_charsEPcS0_eNS_12chars_formatE', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__18to_charsEPcS0_eNS_12chars_formatEi', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__18to_charsEPcS0_f', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__18to_charsEPcS0_fNS_12chars_formatE', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__18to_charsEPcS0_fNS_12chars_formatEi', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__18valarrayImE6resizeEmm', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__18valarrayImEC1Em', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__18valarrayImEC2Em', 'type': 'FUNC'}

diff --git a/.../lib/abi/x86_64-unknown-linux-gnu.libcxxabi.v1.stable.exceptions.no_new_in_libcxx.abilist b/.../lib/abi/x86_64-unknown-linux-gnu.libcxxabi.v1.stable.exceptions.no_new_in_libcxx.abilist
@@ -1573,15 +1573,6 @@
 {'is_defined': True, 'name': '_ZNSt3__18time_getIwNS_19istreambuf_iteratorIwNS_11char_traitsIwEEEEE2idE', 'size': 16, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZNSt3__18time_putIcNS_19ostreambuf_iteratorIcNS_11char_traitsIcEEEEE2idE', 'size': 16, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZNSt3__18time_putIwNS_19ostreambuf_iteratorIwNS_11char_traitsIwEEEEE2idE', 'size': 16, 'type': 'OBJECT'}
-{'is_defined': True, 'name': '_ZNSt3__18to_charsEPcS0_d', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__18to_charsEPcS0_dNS_12chars_formatE', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__18to_charsEPcS0_dNS_12chars_formatEi', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__18to_charsEPcS0_e', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__18to_charsEPcS0_eNS_12chars_formatE', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__18to_charsEPcS0_eNS_12chars_formatEi', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__18to_charsEPcS0_f', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__18to_charsEPcS0_fNS_12chars_formatE', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__18to_charsEPcS0_fNS_12chars_formatEi', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__18valarrayImE6resizeEmm', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__18valarrayImEC1Em', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__18valarrayImEC2Em', 'type': 'FUNC'}

diff --git a/libcxx/src/CMakeLists.txt b/libcxx/src/CMakeLists.txt
@@ -19,26 +19,13 @@ set(LIBCXX_SOURCES
   include/atomic_support.h
   include/config_elast.h
   include/refstring.h
-  include/ryu/common.h
-  include/ryu/d2fixed.h
-  include/ryu/d2fixed_full_table.h
-  include/ryu/d2s.h
-  include/ryu/d2s_full_table.h
-  include/ryu/d2s_intrinsics.h
-  include/ryu/digit_table.h
-  include/ryu/f2s.h
-  include/ryu/ryu.h
-  include/to_chars_floating_point.h
   legacy_pointer_safety.cpp
   memory.cpp
   mutex.cpp
   mutex_destructor.cpp
   new.cpp
   optional.cpp
   random_shuffle.cpp
-  ryu/d2fixed.cpp
-  ryu/d2s.cpp
-  ryu/f2s.cpp
   shared_mutex.cpp
   stdexcept.cpp
   string.cpp

diff --git a/libcxx/src/charconv.cpp b/libcxx/src/charconv.cpp
@@ -9,14 +9,27 @@
 #include "charconv"
 #include <string.h>
 
-#include "include/ryu/digit_table.h"
-#include "include/to_chars_floating_point.h"
-
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 namespace __itoa
 {
 
+static constexpr char cDigitsLut[200] = {
+    '0', '0', '0', '1', '0', '2', '0', '3', '0', '4', '0', '5', '0', '6', '0',
+    '7', '0', '8', '0', '9', '1', '0', '1', '1', '1', '2', '1', '3', '1', '4',
+    '1', '5', '1', '6', '1', '7', '1', '8', '1', '9', '2', '0', '2', '1', '2',
+    '2', '2', '3', '2', '4', '2', '5', '2', '6', '2', '7', '2', '8', '2', '9',
+    '3', '0', '3', '1', '3', '2', '3', '3', '3', '4', '3', '5', '3', '6', '3',
+    '7', '3', '8', '3', '9', '4', '0', '4', '1', '4', '2', '4', '3', '4', '4',
+    '4', '5', '4', '6', '4', '7', '4', '8', '4', '9', '5', '0', '5', '1', '5',
+    '2', '5', '3', '5', '4', '5', '5', '5', '6', '5', '7', '5', '8', '5', '9',
+    '6', '0', '6', '1', '6', '2', '6', '3', '6', '4', '6', '5', '6', '6', '6',
+    '7', '6', '8', '6', '9', '7', '0', '7', '1', '7', '2', '7', '3', '7', '4',
+    '7', '5', '7', '6', '7', '7', '7', '8', '7', '9', '8', '0', '8', '1', '8',
+    '2', '8', '3', '8', '4', '8', '5', '8', '6', '8', '7', '8', '8', '8', '9',
+    '9', '0', '9', '1', '9', '2', '9', '3', '9', '4', '9', '5', '9', '6', '9',
+    '7', '9', '8', '9', '9'};
+
 template <typename T>
 inline _LIBCPP_INLINE_VISIBILITY char*
 append1(char* buffer, T i) noexcept
@@ -29,7 +42,7 @@ template <typename T>
 inline _LIBCPP_INLINE_VISIBILITY char*
 append2(char* buffer, T i) noexcept
 {
-    memcpy(buffer, &__DIGIT_TABLE[(i)*2], 2);
+    memcpy(buffer, &cDigitsLut[(i)*2], 2);
     return buffer + 2;
 }
 
@@ -144,53 +157,4 @@ __u64toa(uint64_t value, char* buffer) noexcept
 
 }  // namespace __itoa
 
-// The original version of floating-point to_chars was written by Microsoft and
-// contributed with the following license.
-
-// Copyright (c) Microsoft Corporation.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-
-// This implementation is dedicated to the memory of Mary and Thavatchai.
-
-to_chars_result to_chars(char* __first, char* __last, float __value) {
-  return _Floating_to_chars<_Floating_to_chars_overload::_Plain>(__first, __last, __value, chars_format{}, 0);
-}
-
-to_chars_result to_chars(char* __first, char* __last, double __value) {
-  return _Floating_to_chars<_Floating_to_chars_overload::_Plain>(__first, __last, __value, chars_format{}, 0);
-}
-
-to_chars_result to_chars(char* __first, char* __last, long double __value) {
-  return _Floating_to_chars<_Floating_to_chars_overload::_Plain>(__first, __last, static_cast<double>(__value),
-                                                                 chars_format{}, 0);
-}
-
-to_chars_result to_chars(char* __first, char* __last, float __value, chars_format __fmt) {
-  return _Floating_to_chars<_Floating_to_chars_overload::_Format_only>(__first, __last, __value, __fmt, 0);
-}
-
-to_chars_result to_chars(char* __first, char* __last, double __value, chars_format __fmt) {
-  return _Floating_to_chars<_Floating_to_chars_overload::_Format_only>(__first, __last, __value, __fmt, 0);
-}
-
-to_chars_result to_chars(char* __first, char* __last, long double __value, chars_format __fmt) {
-  return _Floating_to_chars<_Floating_to_chars_overload::_Format_only>(__first, __last, static_cast<double>(__value),
-                                                                       __fmt, 0);
-}
-
-to_chars_result to_chars(char* __first, char* __last, float __value, chars_format __fmt, int __precision) {
-  return _Floating_to_chars<_Floating_to_chars_overload::_Format_precision>(__first, __last, __value, __fmt,
-                                                                            __precision);
-}
-
-to_chars_result to_chars(char* __first, char* __last, double __value, chars_format __fmt, int __precision) {
-  return _Floating_to_chars<_Floating_to_chars_overload::_Format_precision>(__first, __last, __value, __fmt,
-                                                                            __precision);
-}
-
-to_chars_result to_chars(char* __first, char* __last, long double __value, chars_format __fmt, int __precision) {
-  return _Floating_to_chars<_Floating_to_chars_overload::_Format_precision>(
-      __first, __last, static_cast<double>(__value), __fmt, __precision);
-}
-
 _LIBCPP_END_NAMESPACE_STD
Original file line number	Diff line number	Diff line change
Expand Up		@@ -40,7 +40,6 @@ Paper Status

		.. note::

		.. [#note-P0067] P0067: ``std::(to\|from)_chars`` for integrals has been available since version 7.0. ``std::to_chars`` for ``float`` and ``double`` since version 14.0 ``std::to_chars`` for ``long double`` uses the implementation for ``double``.
		.. [#note-P0607] P0607: The parts of P0607 that are not done are the ``<regex>`` bits.


Expand Down