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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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add_const Update copyright years. 2019-01-01 13:31:55 +01:00
add_cv Update copyright years. 2019-01-01 13:31:55 +01:00
add_lvalue_reference Update copyright years. 2019-01-01 13:31:55 +01:00
add_pointer Update copyright years. 2019-01-01 13:31:55 +01:00
add_rvalue_reference Update copyright years. 2019-01-01 13:31:55 +01:00
add_volatile Update copyright years. 2019-01-01 13:31:55 +01:00
addressof Update copyright years. 2019-01-01 13:31:55 +01:00
align Update copyright years. 2019-01-01 13:31:55 +01:00
aligned_storage Update copyright years. 2019-01-01 13:31:55 +01:00
aligned_union Update copyright years. 2019-01-01 13:31:55 +01:00
alignment_of Update copyright years. 2019-01-01 13:31:55 +01:00
allocator Update copyright years. 2019-01-01 13:31:55 +01:00
allocator_traits Update copyright years. 2019-01-01 13:31:55 +01:00
any Update copyright years. 2019-01-01 13:31:55 +01:00
as_const Update copyright years. 2019-01-01 13:31:55 +01:00
assume_aligned Update copyright years. 2019-01-01 13:31:55 +01:00
auto_ptr Update copyright years. 2019-01-01 13:31:55 +01:00
bad_function_call Update copyright years. 2019-01-01 13:31:55 +01:00
bind Update copyright years. 2019-01-01 13:31:55 +01:00
bool_constant Update copyright years. 2019-01-01 13:31:55 +01:00
common_type/requirements PR libstdc++/89102 fix common_type<> and common_type<T> specializations 2019-02-06 17:25:26 +00:00
conditional/requirements Update copyright years. 2019-01-01 13:31:55 +01:00
decay/requirements Update copyright years. 2019-01-01 13:31:55 +01:00
declval/requirements Update copyright years. 2019-01-01 13:31:55 +01:00
default_delete Update copyright years. 2019-01-01 13:31:55 +01:00
duration P0972R0 <chrono> zero(), min(), and max() should be noexcept 2019-01-11 23:41:05 +00:00
duration_cast Update copyright years. 2019-01-01 13:31:55 +01:00
enable_if/requirements Update copyright years. 2019-01-01 13:31:55 +01:00
enable_shared_from_this Update copyright years. 2019-01-01 13:31:55 +01:00
endian Update copyright years. 2019-01-01 13:31:55 +01:00
exchange Update copyright years. 2019-01-01 13:31:55 +01:00
extent Update copyright years. 2019-01-01 13:31:55 +01:00
forward Update copyright years. 2019-01-01 13:31:55 +01:00
from_chars Update copyright years. 2019-01-01 13:31:55 +01:00
function Update copyright years. 2019-01-01 13:31:55 +01:00
function_objects Update copyright years. 2019-01-01 13:31:55 +01:00
has_unique_object_representations Update copyright years. 2019-01-01 13:31:55 +01:00
has_virtual_destructor Update copyright years. 2019-01-01 13:31:55 +01:00
hash PR libstdc++/88802 define std::hash<nullptr_t> for C++17 2019-01-11 14:54:49 +00:00
headers Update copyright years. 2019-01-01 13:31:55 +01:00
in_place Update copyright years. 2019-01-01 13:31:55 +01:00
integer_sequence Update copyright years. 2019-01-01 13:31:55 +01:00
integral_constant Update copyright years. 2019-01-01 13:31:55 +01:00
is_abstract Update copyright years. 2019-01-01 13:31:55 +01:00
is_aggregate Update copyright years. 2019-01-01 13:31:55 +01:00
is_arithmetic Update copyright years. 2019-01-01 13:31:55 +01:00
is_array Update copyright years. 2019-01-01 13:31:55 +01:00
is_assignable Update copyright years. 2019-01-01 13:31:55 +01:00
is_base_of Update copyright years. 2019-01-01 13:31:55 +01:00
is_class Update copyright years. 2019-01-01 13:31:55 +01:00
is_compound Update copyright years. 2019-01-01 13:31:55 +01:00
is_const Update copyright years. 2019-01-01 13:31:55 +01:00
is_constant_evaluated Update copyright years. 2019-01-01 13:31:55 +01:00
is_constructible Update copyright years. 2019-01-01 13:31:55 +01:00
is_convertible Update copyright years. 2019-01-01 13:31:55 +01:00
is_copy_assignable Update copyright years. 2019-01-01 13:31:55 +01:00
is_copy_constructible Update copyright years. 2019-01-01 13:31:55 +01:00
is_default_constructible Update copyright years. 2019-01-01 13:31:55 +01:00
is_destructible Update copyright years. 2019-01-01 13:31:55 +01:00
is_empty Update copyright years. 2019-01-01 13:31:55 +01:00
is_enum Update copyright years. 2019-01-01 13:31:55 +01:00
is_final Update copyright years. 2019-01-01 13:31:55 +01:00
is_floating_point Update copyright years. 2019-01-01 13:31:55 +01:00
is_function Update copyright years. 2019-01-01 13:31:55 +01:00
is_fundamental Update copyright years. 2019-01-01 13:31:55 +01:00
is_implicitly_default_constructible Update copyright years. 2019-01-01 13:31:55 +01:00
is_integral Update copyright years. 2019-01-01 13:31:55 +01:00
is_invocable Update copyright years. 2019-01-01 13:31:55 +01:00
is_literal_type Update copyright years. 2019-01-01 13:31:55 +01:00
is_lvalue_reference Update copyright years. 2019-01-01 13:31:55 +01:00
is_member_function_pointer Update copyright years. 2019-01-01 13:31:55 +01:00
is_member_object_pointer Update copyright years. 2019-01-01 13:31:55 +01:00
is_member_pointer Update copyright years. 2019-01-01 13:31:55 +01:00
is_move_assignable Update copyright years. 2019-01-01 13:31:55 +01:00
is_move_constructible Update copyright years. 2019-01-01 13:31:55 +01:00
is_nothrow_assignable Update copyright years. 2019-01-01 13:31:55 +01:00
is_nothrow_constructible Update copyright years. 2019-01-01 13:31:55 +01:00
is_nothrow_convertible Update copyright years. 2019-01-01 13:31:55 +01:00
is_nothrow_copy_assignable Update copyright years. 2019-01-01 13:31:55 +01:00
is_nothrow_copy_constructible Update copyright years. 2019-01-01 13:31:55 +01:00
is_nothrow_default_constructible Update copyright years. 2019-01-01 13:31:55 +01:00
is_nothrow_destructible Update copyright years. 2019-01-01 13:31:55 +01:00
is_nothrow_invocable Update copyright years. 2019-01-01 13:31:55 +01:00
is_nothrow_move_assignable Update copyright years. 2019-01-01 13:31:55 +01:00
is_nothrow_move_constructible Update copyright years. 2019-01-01 13:31:55 +01:00
is_nothrow_swappable Update copyright years. 2019-01-01 13:31:55 +01:00
is_nothrow_swappable_with Update copyright years. 2019-01-01 13:31:55 +01:00
is_null_pointer Update copyright years. 2019-01-01 13:31:55 +01:00
is_object Update copyright years. 2019-01-01 13:31:55 +01:00
is_pod Update copyright years. 2019-01-01 13:31:55 +01:00
is_pointer Update copyright years. 2019-01-01 13:31:55 +01:00
is_polymorphic Update copyright years. 2019-01-01 13:31:55 +01:00
is_reference Update copyright years. 2019-01-01 13:31:55 +01:00
is_rvalue_reference Update copyright years. 2019-01-01 13:31:55 +01:00
is_same Update copyright years. 2019-01-01 13:31:55 +01:00
is_scalar Update copyright years. 2019-01-01 13:31:55 +01:00
is_signed Update copyright years. 2019-01-01 13:31:55 +01:00
is_standard_layout Update copyright years. 2019-01-01 13:31:55 +01:00
is_swappable Update copyright years. 2019-01-01 13:31:55 +01:00
is_swappable_with Update copyright years. 2019-01-01 13:31:55 +01:00
is_trivial Update copyright years. 2019-01-01 13:31:55 +01:00
is_trivially_assignable Update copyright years. 2019-01-01 13:31:55 +01:00
is_trivially_constructible Update copyright years. 2019-01-01 13:31:55 +01:00
is_trivially_copy_assignable Update copyright years. 2019-01-01 13:31:55 +01:00
is_trivially_copy_constructible Update copyright years. 2019-01-01 13:31:55 +01:00
is_trivially_copyable Update copyright years. 2019-01-01 13:31:55 +01:00
is_trivially_default_constructible Update copyright years. 2019-01-01 13:31:55 +01:00
is_trivially_destructible Update copyright years. 2019-01-01 13:31:55 +01:00
is_trivially_move_assignable Update copyright years. 2019-01-01 13:31:55 +01:00
is_trivially_move_constructible Update copyright years. 2019-01-01 13:31:55 +01:00
is_union Update copyright years. 2019-01-01 13:31:55 +01:00
is_unsigned Update copyright years. 2019-01-01 13:31:55 +01:00
is_void Update copyright years. 2019-01-01 13:31:55 +01:00
is_volatile Update copyright years. 2019-01-01 13:31:55 +01:00
logical_traits Update copyright years. 2019-01-01 13:31:55 +01:00
make_signed/requirements Update copyright years. 2019-01-01 13:31:55 +01:00
make_unsigned/requirements Update copyright years. 2019-01-01 13:31:55 +01:00
memory_resource Update copyright years. 2019-01-01 13:31:55 +01:00
monotonic_buffer_resource Update copyright years. 2019-01-01 13:31:55 +01:00
move Update copyright years. 2019-01-01 13:31:55 +01:00
move_if_noexcept Update copyright years. 2019-01-01 13:31:55 +01:00
optional Update copyright years. 2019-01-01 13:31:55 +01:00
owner_less Update copyright years. 2019-01-01 13:31:55 +01:00
pair Update copyright years. 2019-01-01 13:31:55 +01:00
pointer_safety Update copyright years. 2019-01-01 13:31:55 +01:00
pointer_traits Update copyright years. 2019-01-01 13:31:55 +01:00
polymorphic_allocator Update copyright years. 2019-01-01 13:31:55 +01:00
rank Update copyright years. 2019-01-01 13:31:55 +01:00
ratio Update copyright years. 2019-01-01 13:31:55 +01:00
raw_storage_iterator Update copyright years. 2019-01-01 13:31:55 +01:00
reference_wrapper Fix tests that fail in C++2a mode 2019-01-29 00:47:32 +00:00
remove_all_extents Update copyright years. 2019-01-01 13:31:55 +01:00
remove_const Update copyright years. 2019-01-01 13:31:55 +01:00
remove_cv Update copyright years. 2019-01-01 13:31:55 +01:00
remove_cvref Update copyright years. 2019-01-01 13:31:55 +01:00
remove_extent Update copyright years. 2019-01-01 13:31:55 +01:00
remove_pointer Update copyright years. 2019-01-01 13:31:55 +01:00
remove_reference Update copyright years. 2019-01-01 13:31:55 +01:00
remove_volatile Update copyright years. 2019-01-01 13:31:55 +01:00
result_of Update copyright years. 2019-01-01 13:31:55 +01:00
scoped_allocator Update copyright years. 2019-01-01 13:31:55 +01:00
shared_ptr Update copyright years. 2019-01-01 13:31:55 +01:00
specialized_algorithms Update copyright years. 2019-01-01 13:31:55 +01:00
steady_clock Update copyright years. 2019-01-01 13:31:55 +01:00
synchronized_pool_resource Update copyright years. 2019-01-01 13:31:55 +01:00
system_clock Update copyright years. 2019-01-01 13:31:55 +01:00
time_point P0972R0 <chrono> zero(), min(), and max() should be noexcept 2019-01-11 23:41:05 +00:00
time_point_cast Update copyright years. 2019-01-01 13:31:55 +01:00
to_address Update copyright years. 2019-01-01 13:31:55 +01:00
to_chars Update copyright years. 2019-01-01 13:31:55 +01:00
tuple Update copyright years. 2019-01-01 13:31:55 +01:00
type_identity/requirements Update copyright years. 2019-01-01 13:31:55 +01:00
typeindex Update copyright years. 2019-01-01 13:31:55 +01:00
underlying_type/requirements Update copyright years. 2019-01-01 13:31:55 +01:00
unique_ptr Update copyright years. 2019-01-01 13:31:55 +01:00
unsynchronized_pool_resource Update copyright years. 2019-01-01 13:31:55 +01:00
unwrap_reference Update copyright years. 2019-01-01 13:31:55 +01:00
uses_allocator Update copyright years. 2019-01-01 13:31:55 +01:00
variant PR libstdc++/87431 fix regression introduced by r264574 2019-01-06 20:52:34 +00:00
void_t Update copyright years. 2019-01-01 13:31:55 +01:00
weak_ptr Update copyright years. 2019-01-01 13:31:55 +01:00
rel_ops.cc Update copyright years. 2019-01-01 13:31:55 +01:00
temporary_buffer.cc Update copyright years. 2019-01-01 13:31:55 +01:00
variable_templates_for_traits.cc Update copyright years. 2019-01-01 13:31:55 +01:00