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std::uses_allocator<std::tuple>

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< cpp‎ | utility‎ | tuple

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C++
 
Utilities-Bibliothek
 
std::tuple
Member-Funktionen
Original:
Member functions
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tuple::tuple
tuple::operator=
tuple::swap
Non-Member-Funktionen
Original:
Non-member functions
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make_tuple
tie
forward_as_tuple
None
operator=
operator!=
operator<
operator<=
operator>
operator>=
std::swap
get
Helper-Klassen
Original:
Helper classes
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tuple_size
tuple_element
uses_allocator
ignore
 
definiert in Header <tuple>
template< class... Types, class Alloc >
struct uses_allocator< std::tuple<Types...>, Alloc > : std::true_type { };
 (seit C++11)
Diese Spezialisierung std::uses_allocator informiert andere Bibliothek-Komponenten, die Tupel support uses-Allocator Bau, obwohl sie nicht über eine verschachtelte allocator_type .
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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Inhaltsverzeichnis

Inherited from std::integral_constant

Member constants

value
[statisch]
 true
(public static Mitglied konstanten)

Member functions

operator bool
wandelt das Objekt bool, gibt value
Original:
converts the object to bool, returns value
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(öffentliche Elementfunktion)

Member types

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

[Bearbeiten] Beispiel

// 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


[Bearbeiten] Siehe auch

(C++11)
 prüft, ob der angegebene Typ allokatorgestützte Erzeugung unterstützt.
(Klassen-Template) [edit]
Von „https://de.cppreference.com/mwiki/index.php?title=cpp/utility/tuple/uses_allocator&oldid=30632“