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Jonathan Wakely 22d34a2a50 libstdc++: Implement P1518R2 for container deduction guides 
This implements the C++23 P1518R2 proposal "Stop overconstraining
allocators in container deduction guides" as a fix for C++17 and C++20
too.

The changes allow class template argument deduction to ignore the type
of a constructor argument that initializes an allocator_type parameter
if the type should be deducible only from the other arguments. So for
the constructor vector(const vector&, const allocator_type&) only the
first argument is used for deduction, allowing the second argument to be
anything that is implicitly convertible to argument_type. Previously
deduction would fail or an ill-formed type would be deduced if the
second argument wasn't of type allocator_type.

The unordered containers do not need changes, because their
allocator-extended constructors use the allocator_type alias, which
comes from the dependent base class so is already a non-deduced context.

libstdc++-v3/ChangeLog:

	* include/bits/forward_list.h (forward_list): Use non-deduced
	context for allocator parameter of allocator-extended copy and
	move constructors.
	* include/bits/stl_bvector.h (vector<bool>): Likewise.
	* include/bits/stl_deque.h (deque): Likewise.
	* include/bits/stl_list.h (list): Likewise.
	* include/bits/stl_map.h (map): Likewise.
	* include/bits/stl_multimap.h (multimap): Likewise.
	* include/bits/stl_multiset.h (multiset): Likewise.
	* include/bits/stl_set.h (set): Likewise.
	* include/bits/stl_vector.h (vector): Likewise.
	* include/bits/stl_queue.h (queue, priority_queue): Do not
	constrain Allocator template parameter of deduction guides that
	have a Container parameter.
	* include/bits/stl_stack.h (stack): Likewise.
	* include/debug/deque (__gnu_debug::deque): Use non-deduced
	context for allocator parameter of allocator-extended copy and
	move constructors.
	* include/debug/list (__gnu_debug::list): Likewise.
	* include/debug/map.h (__gnu_debug::map): Likewise.
	* include/debug/multimap.h (__gnu_debug::multimap): Likewise.
	* include/debug/multiset.h (__gnu_debug::multiset): Likewise.
	* include/debug/set.h (__gnu_debug::set): Likewise.
	* include/debug/vector (__gnu_debug::vector): Likewise.
	* testsuite/23_containers/deque/cons/deduction.cc: Test class
	template argument deduction with non-deduced allocator
	arguments.
	* testsuite/23_containers/forward_list/cons/deduction.cc:
	Likewise.
	* testsuite/23_containers/list/cons/deduction.cc: Likewise.
	* testsuite/23_containers/map/cons/deduction.cc: Likewise.
	* testsuite/23_containers/multimap/cons/deduction.cc: Likewise.
	* testsuite/23_containers/multiset/cons/deduction.cc: Likewise.
	* testsuite/23_containers/priority_queue/deduction.cc: Likewise.
	* testsuite/23_containers/queue/deduction.cc: Likewise.
	* testsuite/23_containers/set/cons/deduction.cc: Likewise.
	* testsuite/23_containers/stack/deduction.cc: Likewise.
	* testsuite/23_containers/unordered_map/cons/deduction.cc:
	Likewise.
	* testsuite/23_containers/unordered_multimap/cons/deduction.cc:
	Likewise.
	* testsuite/23_containers/unordered_multiset/cons/deduction.cc:
	Likewise.
	* testsuite/23_containers/unordered_set/cons/deduction.cc:
	Likewise.
	* testsuite/23_containers/vector/cons/deduction.cc: Likewise.
2021-10-04 15:23:28 +01:00
..
config aix: Protect AIX math.h overloads with new macro. 2021-07-22 11:30:34 -04:00
doc libstdc++: Update documentation that only refers to c++98 and c++11 2021-09-16 23:06:38 +01:00
include libstdc++: Implement P1518R2 for container deduction guides 2021-10-04 15:23:28 +01:00
libsupc++ c++: implement C++17 hardware interference size 2021-09-13 12:28:06 -04:00
po Update copyright years. 2021-01-04 10:26:59 +01:00
python libstdc++: Fix vector<bool> printer tests to work in debug mode 2021-08-18 14:26:38 +01:00
scripts libstdc++: Allow lualatex to be used for Doxygen PDF 2021-05-17 12:13:41 +01:00
src libstdc++: Fix typos in std::filesystem code 2021-10-02 21:20:05 +01:00
testsuite libstdc++: Implement P1518R2 for container deduction guides 2021-10-04 15:23:28 +01:00
acinclude.m4 ctype support for libstdc++ on VxWorks 2021-05-04 21:49:43 -03:00
aclocal.m4
ChangeLog Daily bump. 2021-10-03 00:16:17 +00:00
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ChangeLog-2020 libstdc++: Fix typo in ChangeLog-2020 2021-01-13 11:02:13 +00:00
config.h.in libstdc++: Use secure_getenv for filesystem::temp_directory_path() [PR65018] 2021-07-30 18:12:39 +01:00
configure libstdc++: Check for TLS support on mingw cross-compilers 2021-09-15 09:49:33 +01:00
configure.ac libstdc++: Fix broken autoconf check for O_NONBLOCK 2021-08-31 17:38:27 +01:00
configure.host Scope libstdc++ configuration for vxworks to all versions 2020-10-22 16:40:57 +00:00
crossconfig.m4 libstdc++: Check for TLS support on mingw cross-compilers 2021-09-15 09:49:33 +01:00
fragment.am libstdc++: Add C++ runtime support for new 128-bit long double format 2020-12-16 23:25:01 +00:00
linkage.m4
Makefile.am Update copyright years. 2021-01-04 10:26:59 +01:00
Makefile.in libstdc++: Add C++ runtime support for new 128-bit long double format 2020-12-16 23:25:01 +00:00
README

README 

file: libstdc++-v3/README

New users may wish to point their web browsers to the file
index.html in the 'doc/html' subdirectory.  It contains brief
building instructions and notes on how to configure the library in
interesting ways.