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584d52b088
gcc/libstdc++-v3/include
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Jonathan Wakely 584d52b088 libstdc++: Refactor filesystem::path string conversions 
This simplifies the logic of converting Source arguments and pairs of
InputIterator arguments into the native string format. For any input
that is a contiguous range of path::value_type (or char8_t for POSIX)
a string view can be created and the conversion can be done directly,
with no intermediate allocation. Previously some cases created a
basic_string unnecessarily, for example construction from a pair of
path::string_type::iterators, or a pair of non-const value_type*
pointers.

	* include/bits/fs_path.h (__detail::_S_range_begin)
	(__detail::_S_range_end, path::_S_string_from_iter): Replace with
	overloaded function template __detail::__effective_range.
	(__detail::__effective_range): New overloaded function template to
	create a basic_string or basic_string_view for an effective range.
	(__detail::__value_type_is_char): Use __detail::__effective_range.
	Do not use remove_const on value type.
	(__detail::__value_type_is_char_or_char8_t): Likewise.
	(path::path(const Source&, format))
	(path::path(const Source&, const locale&))
	(path::operator/=(const Source&), path::append(const Source&))
	(path::concat(const Source&)): Use __detail::__effective_range.
	(path::_S_to_string(InputIterator, InputIterator)): New function
	template to create a string view if possible, or string otherwise.
	(path::_S_convert): Add overloads that convert a string returned
	by __detail::__effective_range. Use if-constexpr to inline conversion
	logic from all overloads of _Cvt::_S_convert.
	(path::_S_convert_loc): Add overload that converts a string. Use
	_S_to_string to avoid allocation when possible.
	(path::_Cvt): Remove.
	(path::operator+=(CharT)): Remove indirection through path::concat.
	* include/experimental/bits/fs_path.h (path::_S_convert_loc): Add
	overload for non-const pointers, to avoid constructing a std::string.
	* src/c++17/fs_path.cc (path::_S_convert_loc): Replace conditional
	compilation with call to _S_convert.
2020-05-23 09:40:16 +01:00
..
backward Update copyright years. 2020-01-01 12:51:42 +01:00
bits libstdc++: Refactor filesystem::path string conversions 2020-05-23 09:40:16 +01:00
c Update copyright years. 2020-01-01 12:51:42 +01:00
c_compatibility Update copyright years. 2020-01-01 12:51:42 +01:00
c_global Update copyright years. 2020-01-01 12:51:42 +01:00
c_std Update copyright years. 2020-01-01 12:51:42 +01:00
debug libstdc++: Add comparison operators to associative containers 2020-04-20 17:50:10 +01:00
decimal Update copyright years. 2020-01-01 12:51:42 +01:00
experimental libstdc++: Refactor filesystem::path string conversions 2020-05-23 09:40:16 +01:00
ext libstdc++: Avoid errors in allocator's noexcept-specifier (PR 89510) 2020-04-30 16:01:43 +01:00
parallel libstdc++: Fix some C++20 algorithms to work in parallel mode 2020-05-07 21:43:49 +01:00
precompiled Update copyright years. 2020-01-01 12:51:42 +01:00
pstl Restore enable_if lost during original import of pstl 2019-12-11 03:38:24 +00:00
std Implent C++20 std::atomic_flag::test 2020-05-12 07:37:09 +02:00
tr1 Update copyright years. 2020-01-01 12:51:42 +01:00
tr2 Update copyright years. 2020-01-01 12:51:42 +01:00
Makefile.am libstdc++: Add lightweight replacement for std::numeric_limits (PR 92546) 2020-02-17 15:11:04 +00:00
Makefile.in libstdc++: Add lightweight replacement for std::numeric_limits (PR 92546) 2020-02-17 15:11:04 +00:00