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std::hash

提供: cppreference.com
< cpp‎ | memory‎ | unique ptr

 
 
ユーティリティライブラリ
支援を入力します (basic types, RTTI, type traits)
動的なメモリ管理
エラー処理
プログラムユーティリティ
可変個引数関数
日付と時刻
関数オブジェクト
initializer_list(C++11)
bitset
hash(C++11)
関係演算子
Original:
Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
ペアとタプル
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Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
フォワード、スワップ、および移動
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Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
動的なメモリ管理
低レベルのメモリ管理
アロケータ
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Allocators
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allocator
allocator_traits(C++11)
allocator_arg_t(C++11)
allocator_arg(C++11)
uses_allocator(C++11)
scoped_allocator_adaptor(C++11)
ストレージを初期化されていない
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Uninitialized storage
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uninitialized_copy
uninitialized_copy_n(C++11)
uninitialized_fill
uninitialized_fill_n
raw_storage_iterator
get_temporary_buffer
return_temporary_buffer
スマートポインタ
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Smart pointers
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unique_ptr(C++11)
shared_ptr(C++11)
weak_ptr(C++11)
auto_ptr(廃止予定)
owner_less(C++11)
enable_shared_from_this(C++11)
bad_weak_ptr(C++11)
default_delete(C++11)
ガベージコレクションをサポートしています
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Garbage collection support
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declare_reachable(C++11)
undeclare_reachable(C++11)
declare_no_pointers(C++11)
undeclare_no_pointers(C++11)
pointer_safety(C++11)
get_pointer_safety(C++11)
その他
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Miscellaneous
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pointer_traits(C++11)
addressof(C++11)
align(C++11)
Cライブラリ
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C Library
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のstd :: unique_ptrに
メンバ関数
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Member functions
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unique_ptr::unique_ptr
unique_ptr::~unique_ptr
unique_ptr::operator=
修飾子
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Modifiers
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unique_ptr::release
unique_ptr::reset
unique_ptr::swap
オブザーバー
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Observers
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unique_ptr::get
unique_ptr::get_deleter
unique_ptr::operator bool
unique_ptr::operator*
unique_ptr::operator->
unique_ptr::operator[]
非メンバ関数
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Non-member functions
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operator==
operator!=
operator<
operator>
operator<=
operator>
operator>=
std::swap
std::hash
 
template<class T, class Deleter> struct hash<unique_ptr<T, Deleter>>;
(C++11およびそれ以降)
std::hashstd::unique_ptr<T, Deleter>用のテンプレートの特殊化は、ユーザーがタイプstd::unique_ptr<T, Deleter>のオブジェクトのハッシュ値を取得することができます.
Original:
The template specialization of std::hash for std::unique_ptr<T, Deleter> allows users to obtain hashes of objects of type std::unique_ptr<T, Deleter>.
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与えられたstd::unique_ptr<T, Deleter> pについては、この専門化はそのstd::hash<std::unique_ptr<T, Deleter>>()(p) == std::hash<T*>()(p.get())を保証.
Original:
For a given std::unique_ptr<T, Deleter> p, this specialization ensures that std::hash<std::unique_ptr<T, Deleter>>()(p) == std::hash<T*>()(p.get()).
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[編集]

#include <iostream>
#include <memory>
#include <functional>
 
struct Foo {
    Foo() { std::cout << "Foo...\n"; }
    ~Foo() { std::cout << "~Foo...\n\n"; }
};
 
int main()
{
    Foo* foo = new Foo();
    std::unique_ptr<Foo> up(foo);
 
    std::cout << "hash(up):  " << std::hash<std::unique_ptr<Foo>>()(up) << '\n';
    std::cout << "hash(foo): " << std::hash<Foo*>()(foo) << '\n';
}

Output:

Foo...
hash(up):  3686401041
hash(foo): 3686401041
~Foo...

[編集] も参照してください

(C++11)
hash function object
(クラステンプレート) [edit]