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<div class="t-tr-text">C + +の概念:<div class="t-tr-dropdown"><div><div><div class="t-tr-dropdown-arrow-border"></div><div class="t-tr-dropdown-arrow"></div><div class="t-tr-dropdown-h">Original:</div><div class="t-tr-dropdown-orig">C++ concepts:</div><div class="t-tr-dropdown-notes">The text has been machine-translated via [http://translate.google.com Google Translate].<br/> You can help to correct and verify the translation. Click [http://en.cppreference.com/w/Cppreference:MachineTranslations here] for instructions.</div></div></div></div></div> Allocator

提供: cppreference.com
< cpp‎ | concept

 
 
C + +の概念
基本
Original:
Basic
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ライブラリワイド
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Library-Wide
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NullablePointer(C++11)
Hash(C++11)
Allocator
コンテナ
Original:
Container
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コンテナ要素
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Container Elements
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イテレータ
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Iterator
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乱数
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Random Numbers
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同時実行
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Concurrency
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BasicLockable(C++11)
Lockable(C++11)
TimedLockable(C++11)
Mutex(C++11)
TimedMutex(C++11)
その他
Original:
Other
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メモリの割り当てと解放の戦略をカプセル化します.
Original:
Encapsulates memory allocation and deallocation strategy.
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std::string除くstd::vectorから、std::array、すべてのコンテナ、ストレージを割り当てまたは解放する必要があるかもしれませんすべての標準ライブラリコンポーネントstd::shared_ptrstd::functionAllocatorを通してそうします:以下の要件を満たすクラス型のオブジェクト.
Original:
Every standard library component that may need to allocate or release storage, from std::string, std::vector, and every container except std::array, to std::shared_ptr and std::function, does so through an Allocator: an object of a class type that satisfies the following requirements.
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いくつかの要件はオプションです。テンプレートstd::allocator_traitsは直接ではなく、すべてのオプションの要件については、デフォルトの実装、およびすべての標準ライブラリコンテナと他のアロケータ対応のクラスstd::allocator_traitsを通じてアロケータへのアクセスを提供します.
Original:
Some requirements are optional: the template std::allocator_traits supplies the default implementations for all optional requirements, and all standard library containers and other allocator-aware classes access the allocator through std::allocator_traits, not directly.
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[編集] 要件

与えられた
Original:
Given
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  • A、型T用のアロケータ
    Original:
    A, an Allocator for type T
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  • B、型Uに同じアロケータ
    Original:
    B, the same Allocator for type U
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  • ptrallocator_traits<A>::pointerを呼び出すことによって取得型allocator_traits<A>::allocate()の値
    Original:
    ptr, a value of type allocator_traits<A>::pointer, obtained by calling allocator_traits<A>::allocate()
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  • cptrallocator_traits<A>::const_pointerからの変換によって得られるタイプptrの値
    Original:
    cptr, a value of type allocator_traits<A>::const_pointer, obtained by conversion from ptr
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  • vptrallocator_traits<A>::void_pointerからの変換によって得られるタイプptrの値
    Original:
    vptr, a value of type allocator_traits<A>::void_pointer, obtained by conversion from ptr
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  • cvptrallocator_traits<A>::const_void_pointerからまたはcptrからの変換によって得られるタイプvptrの値
    Original:
    cvptr, a value of type allocator_traits<A>::const_void_pointer, obtained by conversion from cptr or from vptr
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  • xptr、いくつかの型Xdereferencableへのポインタ
    Original:
    xptr, a dereferencable pointer to some type X
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Expression Requirements Return type
A::pointer (オプション) Satisfies NullablePointer and RandomAccessIterator
A::const_pointer (オプション) A::pointer is convertible to A::const_pointer. Satisfies NullablePointer and RandomAccessIterator
A::void_pointer (オプション) A::pointer is convertible to A::void_pointer
B::void_pointerA::void_pointerと同じ型です。満たすNullablePointer
Original:
B::void_pointer and A::void_pointer are the same type. Satisfies NullablePointer
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A::const_void_pointer (オプション) A::pointer, A::const_pointer, and A::void_pointer are convertible to A::const_void_pointer
B::const_void_pointerA::const_void_pointerと同じ型です。満たすNullablePointer
Original:
B::const_void_pointer and A::const_void_pointer are the same type. Satisfies NullablePointer
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A::value_type the type T
A::size_type (オプション) A::size_type can represent the size of the largest object A can allocate unsigned integer type
A::difference_type (オプション) A::difference_type can represent the difference of any two pointers to the objects allocated by A signed integer type
A::template rebind<U>::other ([1]はオプション) for any U, B::template rebind<T>::other is A the type B
*ptr T&
*cptr *cptr and *ptr identify the same object const T&
ptr->m same as (*ptr).m, if (*ptr).m is well-defined the type of T::m
cptr->m same as (*cptr).m, if (*cptr).m is well-defined the type of T::m
static_cast<A::pointer>(vptr) static_cast<A::pointer>(vptr) == ptr A::pointer
static_cast<A::const_pointer>(cvptr) static_cast<A::const_pointer>(vptr) == cptr A::const_pointer
a.allocate(n) allocates storage suitable for n objects of type T, but does not construct them. May throw exceptions. A::pointer
a.allocate(n, cptr) (オプション) same as a.allocate(n), but may use cptr in unspecified manner to aid locality A::pointer
a.deallocate(ptr, n) deallocates storage previously allocated by a call to a.allocate(n). Does not call destructors, if any objects were constructed, they must be destroyed before calling a.deallocate(). Does not throw exceptions. (not used)
a.max_size() (オプション) the largest value that can be passed to A::allocate() A::size_type
a1 == a2 returns true only if the storage allocated by the allocator a1 can be deallocated through a2. Establishes reflexive, symmetric, and transitive relationship. Does not throw exceptions. bool
a1 != a2 same as !(a1==a2) bool
A a1(a) Copy-constructs a1 such that a1 == a. Does not throw exceptions.
A a(b) Constructs a such that B(a)==b and A(b)==a. Does not throw exceptions.
A a1(std::move(a)) Constructs a1 such that it equals the prior value of a. Does not throw exceptions.
A a(std::move(b)) Constructs a such that it equals the prior value of A(b). Does not throw exceptions.
a.construct(xptr, args) (オプション) Constructs an object of type X in previously-allocated storage at the address pointed to by xptr, using args as the constructor arguments
a.destroy(xptr) (オプション) Destructs an object of type X pointed to by xptr, but does not deallocate any storage.
a.select_on_container_copy_construction() (オプション) Provides an instance of A to be used by the container that is copy-constructed from the one that uses a currently. Usually returns either a copy of a or a default-constructed A(). A
a.propagate_on_container_copy_assignment (オプション) true if the allocator of type A needs to be copied when the container that uses it is copy-assigned std::true_type or std::false_type or derived from such
a.propagate_on_container_move_assignment (オプション) true if the allocator of type A needs to be copied when the container that uses it is move-assigned std::true_type or std::false_type or derived from such
a.propagate_on_container_swap (オプション) true if the allocators of type A need to be swapped when two containers that use them are swapped std::true_type or std::false_type or derived from such
注:
Original:
Notes:
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このアロケータはフォームSomeAllocatorのテンプレートの場合、[1] REBINDのみ省略可能です(標準で提供される:: allocator_traits)<T, Argsは、ゼロ以上の追加のテンプレートパラメータであるArgs>、.
Original:
[1] rebind is only optional (provided by std::allocator_traits) if this allocator is a template of the form SomeAllocator<T, Args>, where Args is zero or more additional template parameters.
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