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Jonathan Wakely 373c726ec6 PR libstdc++/89102 fix common_type<> and common_type<T> specializations 
This is a partial implementation of the revised std::common_type rules
from P0435R1.

	PR libstdc++/89102 (partial)
	* include/std/type_traits (common_type<>): Define.
	(common_type<T>): Derive from common_type<T, T>.
	* testsuite/20_util/common_type/requirements/explicit_instantiation.cc:
	Test zero-length template argument list.
	* testsuite/20_util/common_type/requirements/sfinae_friendly_1.cc:
	Test additional single argument cases.
	* testsuite/20_util/common_type/requirements/sfinae_friendly_2.cc:
	Adjust expected error.

From-SVN: r268586
2019-02-06 17:25:26 +00:00
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algorithm
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2019-01-01 13:31:55 +01:00
any
Fix missing or incorrect feature test macros
2019-01-15 12:01:12 +00:00
array
Fix after P0600.
2019-01-21 11:47:30 +00:00
atomic
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2019-01-01 13:31:55 +01:00
bit
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bitset
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charconv
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2019-01-01 13:31:55 +01:00
chrono
P0972R0 <chrono> zero(), min(), and max() should be noexcept
2019-01-11 23:41:05 +00:00
codecvt
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complex
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condition_variable
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deque
Define __cpp_lib_erase_if feature test macro
2019-01-10 13:49:31 +00:00
filesystem
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2019-01-01 13:31:55 +01:00
forward_list
Avoid ambiguity between C++2a std::erase_if and LFTS version
2019-01-29 00:47:38 +00:00
fstream
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functional
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future
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iomanip
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ios
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iosfwd
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iostream
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istream
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iterator
Fix more missing or incorrect feature test macros
2019-01-15 12:58:19 +00:00
limits
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list
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2019-01-29 00:47:38 +00:00
locale
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map
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memory
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memory_resource
Ensure pool resources always use normal mode vector
2019-01-29 00:47:25 +00:00
mutex
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numeric
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optional
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2019-01-15 12:01:12 +00:00
ostream
Implement LWG 2221: formatted output operator for nullptr
2019-01-10 13:14:57 +00:00
queue
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random
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ratio
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regex
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scoped_allocator
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set
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shared_mutex
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sstream
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stack
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stdexcept
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streambuf
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string
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string_view
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system_error
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thread
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tuple
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type_traits
PR libstdc++/89102 fix common_type<> and common_type<T> specializations
2019-02-06 17:25:26 +00:00
typeindex
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unordered_map
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unordered_set
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utility
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valarray
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variant
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2019-01-15 12:01:12 +00:00
vector
Ensure pool resources always use normal mode vector
2019-01-29 00:47:25 +00:00
version
Update value of __cpp_lib_shared_ptr_arrays macro
2019-01-15 13:13:11 +00:00