std::uses_allocator<std::tuple>
From cppreference.com
| Defined in header <tuple>
|
||
| template< class... Types, class Alloc > struct uses_allocator< std::tuple<Types...>, Alloc > : std::true_type { }; |
(since C++11) | |
This specialization of std::uses_allocator informs other library components that tuples support uses-allocator construction, even though they do not have a nested allocator_type.
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) |
Member types
| Type | Definition |
| value_type | bool |
| type | std::integral_constant<bool, value> |
[edit] Example
// myalloc is a stateful Allocator with a single-argument constructor // that takes an int. It has no default constructor. typedef std::vector<int, myalloc<int>> innervector_t; typedef std::tuple<int, innervector_t> elem_t; typedef std::scoped_allocator_adaptor< myalloc<elem_t>, myalloc<int>> Alloc; Alloc a(1,2); std::vector<elem_t, Alloc> v(a); v.resize(1); // uses allocator #1 for elements of v std::get<1>(v[0]).resize(10); // uses allocator #2 for innervector_t
[edit] See also
| (C++11) |
checks if the specified type supports uses-allocator construction (class template) |
