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std::uses_allocator<std::flat_map> - cppreference.com

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template< class Key, class T, class Compare, class KeyContainer, class MappedContainer, class Allocator > struct uses_allocator<std::flat_map<Key, T, Compare, KeyContainer, MappedContainer>, Allocator> : std::bool_constant<std::uses_allocator_v<KeyContainer, Allocator> && std::uses_allocator_v<MappedContainer, Allocator>> {};

 (since C++23)

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

Inherited from std::integral_constant

Member constants

true
(public static member constant)

Member functions

converts the object to bool, returns value
(public member function)
returns value
(public member function)

Member types

Type Definition
value_type bool
type std::integral_constant<bool, value>

Example

#include <memory>
#include <flat_map>

static_assert(
    std::uses_allocator<std::flat_map<int, int>, void>::value == false &&
    std::uses_allocator<std::flat_map<int, int>, std::allocator<int>>::value == true
);
 
int main() {}

See also

checks if the specified type supports uses-allocator construction
(class template) [edit]