std::uses_allocator<std::flat_map>
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
#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
|
(C++11) | checks if the specified type supports uses-allocator construction (class template) |
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