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gcc/libstdc++-v3/include/std
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Jonathan Wakely 7bafcc3617 libstdc++: Make CTAD ignore tuple(const Types&...) constructor [PR121771] 
This is similar to the r16-3536-g0bb0d1d2880d56 change for std::pair, so
that CTAD ignores the tuple(const Types&...) constructor and only uses
the tuple(Types...) -> tuple<Types...> deduction guide. This ensures
that the deduced type comes from the decayed argument types.

libstdc++-v3/ChangeLog:

	PR libstdc++/121771
	* include/std/tuple (tuple::tuple(const Elements&...)): Use
	type_identity_t to prevent constructor being used for CTAD.
	(tuple::tuple(allocator_arg_t, const A&, const Elements&...)):
	Likewise.
	* testsuite/20_util/tuple/cons/121771.cc: New test.

Reviewed-by: Ville Voutilainen <ville.voutilainen@gmail.com>
2026-02-13 09:06:31 +00:00
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algorithm
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any
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array
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atomic
libstdc++: Clear padding bits in std::atomic ctor in C++11 [PR114865]
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barrier
libstdc++: Fix memory leak in std::barrier destructor [PR123378]
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bit
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bitset
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charconv
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chrono
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codecvt
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complex
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concepts
libstdc++: Use overload operator<=> when provided in relational functors [PR114153]
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condition_variable
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contracts
libstdc++: Fix ambiguity caused by new std::source_location constructor
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coroutine
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debugging
libstdc++: Implement C++26 <debugging> features [PR119670]
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deque
libstdc++: Fix std::erase_if behavior for std::__debug containers
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execution
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expected
libstdc++: Make std::expected trivially copy/move assignable (LWG 4026)
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filesystem
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flat_map
libstdc++: constexpr flat_map and flat_multimap
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flat_set
libstdc++: Implement C++26 P3378R2 - constexpr exception types
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format
libstdc++: Implement C++26 P3378R2 - constexpr exception types
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forward_list
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fstream
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functional
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future
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generator
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inplace_vector
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iomanip
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ios
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iostream
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istream
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iterator
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latch
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limits
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list
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locale
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map
libstdc++: container erasure overloads (P2077) [PR117404]
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mdspan
libstdc++: Make <mdspan> compatible with clang.
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memory
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meta
libstdc++: Define __cpp_lib_define_static [PR123921]
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mutex
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numbers
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optional
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ostream
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print
libstdc++: Implement P3107R5 optimizations for std::print [PR121790]
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queue
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random
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ranges
libstdc++: Make function_ref non-dangling for stateless wrappers
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ratio
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regex
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set
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shared_mutex
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source_location
libstdc++: Fix ambiguity caused by new std::source_location constructor
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span
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spanstream
libstdc++: Fix some -Wsign-compare warnings in headers
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sstream
libstdc++: Fix std::basic_stringbuf::str()&& [PR123100]
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stack
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stacktrace
libstdc++: Improve ostream output for std::stacktrace
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string
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thread
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tuple
libstdc++: Make CTAD ignore tuple(const Types&...) constructor [PR121771]
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type_traits
libstdc++: Fix fallback definitions of std::is_member_*_pointer
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typeindex
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unordered_map
libstdc++: container erasure overloads (P2077) [PR117404]
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unordered_set
libstdc++: container erasure overloads (P2077) [PR117404]
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variant
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vector
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