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std::uses_allocator<std::tuple>

提供: cppreference.com
< cpp‎ | utility‎ | tuple

Defined in header <tuple>
template< class... Types, class Alloc >
struct uses_allocator< std::tuple<Types...>, Alloc > : std::true_type { };
(C++11およびそれ以降)
std::uses_allocatorのこの専門分野は、他のライブラリコンポーネントに通知し、そのタプルのサポート使用するアロケータ建設、それらが入れ子になったallocator_typeを持っていないにもかかわらず.
Original:
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.
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目次

Inherited from std::integral_constant

Member constants

value
[静的]
true
(パブリック静的メンバ定数)

Member functions

operator bool
boolにオブジェクトは、value返しに変換します
Original:
converts the object to bool, returns value
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(パブリックメンバ関数)

Member types

タイプ
Original:
Type
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Definition
value_type bool
type std::integral_constant<bool, value>

[編集]

// 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


[編集] も参照してください

チェックを指定した型が使用するアロケータ構築をサポートしている場合
Original:
checks if the specified type supports uses-allocator construction
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(クラステンプレート) [edit]