std::uses_allocator<std::variant>
From cppreference.com
| template <class... Types, class Alloc>
struct uses_allocator<std::variant<Types...>, Alloc> : std::true_type { }; |
(since C++17) | |
Provides a specialization of the std::uses_allocator type trait for std::variant to inform other library components that variant can be constructed with an allocator, even though it does not have a nested allocator_type.
| Type requirements | ||
-
Alloc must meet the requirements of Allocator.
|
Contents |
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> |
[edit] Notes
The std::variant itself does not use allocators, it passes then through to the constructors of the contained values.
[edit] Example
| This section is incomplete Reason: no example |
[edit] See also
| (C++11)
|
checks if the specified type supports uses-allocator construction (class template) |