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Patrick Palka 37edf28c24 libstdc++: Remove overzealous static_asserts from std::span 
For a span with statically empty extent, we currently model the
preconditions of front(), back(), and operator[] as if they are
mandates, by using a static_assert to verify that extent != 0.  This
causes us to reject valid programs that would instantiate these member
functions and at runtime never call them.

Since they are already followed by more general runtime asserts, this
patch just removes these static_asserts altogether,

libstdc++-v3/ChangeLog:

	* include/std/span (span::front): Remove static_assert.
	(span::back): Likewise.
	(span::operator[]): Likewise.
	* testsuite/23_containers/span/back_neg.cc: Rewrite to verify
	that we check the preconditions of back() only when it's called.
	* testsuite/23_containers/span/front_neg.cc: Likewise for
	front().
	* testsuite/23_containers/span/index_op_neg.cc: Likewise for
	operator[].
2020-09-21 23:21:34 -04:00
..
config libstdc++: Support futex waiting on chrono::steady_clock directly 2020-09-11 14:25:00 +01:00
doc libstdc++: Implement P0966 std::string::reserve should not shrink 2020-08-06 19:49:07 +01:00
include libstdc++: Remove overzealous static_asserts from std::span 2020-09-21 23:21:34 -04:00
libsupc++ libstdc++-v3/libsupc++/eh_call.cc: Avoid "set but not used" warning 2020-09-11 13:00:29 +00:00
po libstdc++: Regenerate makefiles 2020-06-23 07:59:40 +01:00
python libstdc++: Fix compatibility support in unique_ptr pretty printer 2020-08-10 18:47:06 +01:00
scripts Update copyright years. 2020-01-01 12:51:42 +01:00
src libstdc++: Support futex waiting on chrono::steady_clock directly 2020-09-11 14:25:00 +01:00
testsuite libstdc++: Remove overzealous static_asserts from std::span 2020-09-21 23:21:34 -04:00
acinclude.m4 libstdc++: Deprecate the --enable-cheaders=c_std configuration 2020-08-13 16:33:28 +01:00
aclocal.m4 Add `--with-toolexeclibdir=' configuration option 2020-01-24 11:24:25 +00:00
ChangeLog Daily bump. 2020-09-22 00:16:31 +00:00
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ChangeLog-2018 Update copyright years. 2019-01-01 13:31:55 +01:00
ChangeLog-2019 libstdc++: Fix whitespace in ChangeLog-2019 2020-01-09 21:31:35 +00:00
config.h.in libstdc++: Add std::from_chars for floating-point types 2020-07-20 23:49:27 +01:00
configure libstdc++: Deprecate the --enable-cheaders=c_std configuration 2020-08-13 16:33:28 +01:00
configure.ac libstdc++: Add std::from_chars for floating-point types 2020-07-20 23:49:27 +01:00
configure.host aix: Add GCC64 configuration and FAT target libraries. 2020-06-21 14:14:46 -04:00
crossconfig.m4 libstdc++: Add std::from_chars for floating-point types 2020-07-20 23:49:27 +01:00
fragment.am
linkage.m4
Makefile.am build: Use -include instead of conditional include. 2020-06-22 21:31:48 +00:00
Makefile.in build: Use -include instead of conditional include. 2020-06-22 21:31:48 +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.