From cppreference.com
template<classKey,classT,classCompare,classKeyContainer,classMappedContainer,classAllocator>structuses_allocator<std::flat_multimap<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
type trait for std::flat_multimap: the container adaptor uses allocator if and only if the underlying container does.
Inherited from
Member constants
value
[static]
true
(public static member constant)Member functions
operator bool
converts the object to bool, returns value
(public member function)operator()
(C++14)
returns value
(public member function)Member types
Type Definition value_typebooltypestd::integral_constant<bool,value>Example
Run this code
#include<memory>#include<flat_map>static_assert(std::uses_allocator<std::flat_multimap<int,int>,void>::value==false&&std::uses_allocator<std::flat_multimap<int,int>,std::allocator<int>>::value==true);intmain(){}See also
(C++11)
checks if the specified type supports uses-allocator construction
(class template)