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gcc/libstdc++-v3
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Jonathan Wakely 89ec3b67db libstdc++: fix is_default_constructible for hash containers [PR 100863] 
The recent change to _Hashtable_ebo_helper for this PR broke the
is_default_constructible trait for a hash container with a non-default
constructible allocator. That happens because the constructor needs to
be user-provided in order to initialize the member, and so is not
defined as deleted when the type is not default constructible.

By making _Hashtable derive from _Enable_special_members we can ensure
that the default constructor for the std::unordered_xxx containers is
deleted when it would be ill-formed. This makes the trait give the
correct answer.

Signed-off-by: Jonathan Wakely <jwakely@redhat.com>

libstdc++-v3/ChangeLog:

	PR libstdc++/100863
	* include/bits/hashtable.h (_Hashtable): Conditionally delete
	default constructor by deriving from _Enable_special_members.
	* testsuite/23_containers/unordered_map/cons/default.cc: New test.
	* testsuite/23_containers/unordered_set/cons/default.cc: New test.
2021-07-20 16:22:26 +01:00
..
config ctype support for libstdc++ on VxWorks 2021-05-04 21:49:43 -03:00
doc libstdc++: Improvements to Doxygen markup 2021-07-01 18:45:48 +01:00
include libstdc++: fix is_default_constructible for hash containers [PR 100863] 2021-07-20 16:22:26 +01:00
libsupc++ libstdc++: Improvements to Doxygen markup 2021-07-01 18:45:48 +01:00
po Update copyright years. 2021-01-04 10:26:59 +01:00
python libstdc++: Fix installation of python hooks [PR 99453] 2021-06-01 13:29:34 +01:00
scripts libstdc++: Allow lualatex to be used for Doxygen PDF 2021-05-17 12:13:41 +01:00
src libstdc++: Add more tests for filesystem::create_directory [PR101510] 2021-07-20 12:54:30 +01:00
testsuite libstdc++: fix is_default_constructible for hash containers [PR 100863] 2021-07-20 16:22:26 +01:00
acinclude.m4 ctype support for libstdc++ on VxWorks 2021-05-04 21:49:43 -03:00
aclocal.m4
ChangeLog Daily bump. 2021-07-17 00:16:31 +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++: Remove _GLIBCXX_USE_INT128 autoconf macro 2021-05-04 12:07:09 +01:00
configure ctype support for libstdc++ on VxWorks 2021-05-04 21:49:43 -03:00
configure.ac libstdc++: Remove _GLIBCXX_USE_INT128 autoconf macro 2021-05-04 12:07:09 +01:00
configure.host Scope libstdc++ configuration for vxworks to all versions 2020-10-22 16:40:57 +00:00
crossconfig.m4 Scope libstdc++ configuration for vxworks to all versions 2020-10-22 16:40:57 +00:00
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.