std::uses_allocator<std::flat_map>

 

C++

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Technical specifications

Symbols index

External libraries

 

Containers library

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array (C++11)

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vector<bool>

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map

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unordered_set (C++11)

unordered_multiset (C++11)

unordered_map (C++11)

unordered_multimap (C++11)

Adaptors

stack

queue

priority_queue

flat_set (C++23)

flat_multiset (C++23)

flat_map (C++23)

flat_multimap (C++23)

Views

span (C++20)

mdspan (C++23)

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Iterator invalidation

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Non-member function table

 

std::flat_map

Member types

Member functions

flat_map::flat_map flat_map::operator= Element access flat_map::at flat_map::operator[] Iterators flat_map::beginflat_map::cbegin flat_map::endflat_map::cend flat_map::rbeginflat_map::crbegin flat_map::rendflat_map::crend Lookup flat_map::count flat_map::find flat_map::contains flat_map::equal_range    flat_map::lower_bound flat_map::upper_bound Capacity flat_map::size flat_map::max_size flat_map::empty Modifiers flat_map::clear flat_map::erase flat_map::swap flat_map::emplace flat_map::extract flat_map::replace flat_map::insert flat_map::insert_range flat_map::insert_or_assign flat_map::emplace_hint flat_map::try_emplace Observers flat_map::key_comp flat_map::keys flat_map::value_comp flat_map::values

Non-member functions

operator==operator<=>         swap(std::flat_map) erase_if(std::flat_map)

Helper classes

uses_allocator<std::flat_map>

Tags

sorted_unique       sorted_unique_t

Deduction guides

 

Defined in header <flat_map>
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

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_type	bool
type	std::integral_constant<bool, value>

Example

Run this code

#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

uses_allocator (C++11)

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