std::set::extract

`node_type extract( const_iterator position );`	(1)	( C++17)
`node_type extract( const key_type& x );`	(2)	( C++17)

1) , , position

2) , x, , . , .

, , ( , erase())

. , , : , .

position
x

, , , (2)

1)

2) log(a.size())

extract - set

set<move_only_type> s;
s.emplace(...);
move_only_type mot = move(s.extract(s.begin()).value());

-
set::set
set::~set
set::operator=
set::get_allocator

set::beginset::cbegin (C++11)
set::endset::cend (C++11)
set::rbeginset::crbegin (C++11)
set::rendset::crend (C++11)

set::empty
set::size
set::max_size

set::clear
set::insert
set::insert_range (C++23)
set::emplace (C++11)
set::emplace_hint (C++11)
set::erase
set::swap
set::extract (C++17)
set::merge (C++17)

set::count
set::find
set::contains (C++20)
set::equal_range
set::lower_bound
set::upper_bound

set::key_comp
set::value_comp
,
std::swap
erase_if (C++20)
operator==operator!=operator<operator>operator<=operator>=operator<=> ( C++20)( C++20)( C++20)( C++20)( C++20)(C++20)
(C++17)