std::uses_allocator<std::flat_multiset>

Since C++23

Header: <flat_set>

Provides a transparent specialization of the std::uses_allocator type trait for std::flat_multiset: the container adaptor uses allocator if and only if the underlying container does.

# Declarations

template< class Key, class Compare, class KeyContainer, class Allocator >
struct uses_allocator<std::flat_multiset<Key, Compare, KeyContainer>, Allocator>
: std::bool_constant<std::uses_allocator_v<KeyContainer, Allocator>> {};

(since C++23)

# Example

#include <memory>
#include <flat_set>
 
static_assert(
    std::uses_allocator<std::flat_multiset<int>, void>::value == false &&
    std::uses_allocator<std::flat_multiset<int>, std::allocator<int>>::value == true
);
 
int main() {}

# See also