gcc/libstdc++-v3
Patrick Palka 8f0d8cd852 libstdc++: LWG 3286 ranges::size is not required to be valid after ...
... a call to ranges::begin on an input range.

This implements LWG 3286.  The new wording for the single-argument constructor
for subrange is implemented by splitting the constructor into two delegating
constructors, one constrained by _S_store_size and the other by !_S_store_size.

Tested on x86_64-pc-linux-gnu, both added tests fail before the patch and pass
with the patch.

libstdc++-v3/ChangeLog:

	LWG 3286 ranges::size is not required to be valid after a call to
	ranges::begin on an input range
	* include/std/ranges (subrange::subrange): Split single-argument
	constructor into two, one constrained by _S_store_size and another by
	!_S_store_size.
	(take_view::begin): Call size() before calling ranges::begin(_M_base).
	* testsuite/std/ranges/adaptors/lwg3286.cc: New test.
	* testsuite/std/ranges/subrange/lwg3286.cc: New test.
2020-03-11 00:40:33 -04:00
..
config x32: Update baseline_symbols.txt 2020-03-01 06:13:28 -08:00
doc Add `--with-toolexeclibdir=' configuration option 2020-01-24 11:24:25 +00:00
include libstdc++: LWG 3286 ranges::size is not required to be valid after ... 2020-03-11 00:40:33 -04:00
libsupc++ libstdc++: Remove std::type_info::operator!= for C++20 2020-02-20 11:30:19 +00:00
po Add `--with-toolexeclibdir=' configuration option 2020-01-24 11:24:25 +00:00
python libstdc++: Fix regression in libstdc++-prettyprinters/cxx20.cc 2020-02-17 13:20:57 +00:00
scripts
src libstdc++: Handle type-changing path concatenations (PR 94063) 2020-03-09 23:22:57 +00:00
testsuite libstdc++: LWG 3286 ranges::size is not required to be valid after ... 2020-03-11 00:40:33 -04:00
acinclude.m4 libstdc++: Replace glibc-specific check for clock_gettime (PR 93325) 2020-01-28 13:24:09 +00:00
aclocal.m4 Add `--with-toolexeclibdir=' configuration option 2020-01-24 11:24:25 +00:00
ChangeLog libstdc++: LWG 3286 ranges::size is not required to be valid after ... 2020-03-11 00:40:33 -04:00
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ChangeLog-2019 libstdc++: Fix whitespace in ChangeLog-2019 2020-01-09 21:31:35 +00:00
config.h.in
configure Use a non-empty test program to test ability to link. 2020-02-12 13:22:07 -08:00
configure.ac
configure.host
crossconfig.m4 reject macros in math decl check 2020-01-23 16:44:54 -03:00
fragment.am
linkage.m4
Makefile.am
Makefile.in Add `--with-toolexeclibdir=' configuration option 2020-01-24 11:24:25 +00:00
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.