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std::hash

De cppreference.com
< cpp‎ | memory‎ | unique ptr

 
 
Utilidades de la biblioteca
Escriba apoyo (basic types, RTTI, type traits)
Gestión de memoria dinámica
Gestión de errores
Programa de servicios públicos
Funciones variadic
Fecha y hora
Objetos Function
(C++11)
Operadores relacionales
Original:
Relational operators
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Pares y tuplas
Original:
Pairs and tuples
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(C++11)
Cambiar, hacia adelante y mover
Original:
Swap, forward and move
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(C++11)
(C++11)
(C++11)
 
Gestión de memoria dinámica
Bajo la gestión de memoria de nivel
Los asignadores
Original:
Allocators
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Inicializar el almacenamiento
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Uninitialized storage
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Punteros inteligentes
Original:
Smart pointers
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(C++11)
(C++11)
(C++11)
(obsoleto)
(C++11)
Garbage soporte colección
Original:
Garbage collection support
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Varios
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Miscellaneous
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(C++11)
(C++11)
C Library
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C Library
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std :: unique_ptr
Las funciones miembro
Original:
Member functions
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Modificadores
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Modifiers
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Los observadores
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Observers
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Terceros funciones
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Non-member functions
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std::hash
 
template<class T, class Deleter> struct hash<unique_ptr<T, Deleter>>;
(desde C++11)
La especialización de plantilla de std::hash para std::unique_ptr<T, Deleter> permite a los usuarios obtener los valores hash de los objetos de tipo std::unique_ptr<T, Deleter> .
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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Para un std::unique_ptr<T, Deleter> p dado, esta especialización se asegura de que std::hash<std::unique_ptr<T, Deleter>>()(p) == std::hash<T*>()(p.get()) .
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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[editar] Ejemplo

#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';
}

Salida:

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

[editar] Ver también

(C++11)
hash function object
(plantilla de clase) [editar]