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std::unique_ptr::reset

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< 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
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Relational operators
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Pares y tuplas
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Pairs and tuples
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(C++11)
Cambiar, hacia adelante y mover
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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
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Allocators
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Inicializar el almacenamiento
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Uninitialized storage
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Punteros inteligentes
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Smart pointers
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(C++11)
(C++11)
(C++11)
(obsoleto)
(C++11)
Garbage soporte colección
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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
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Member functions
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Modificadores
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Modifiers
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unique_ptr::reset
Los observadores
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Observers
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Terceros funciones
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Non-member functions
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void reset( pointer ptr = pointer() );
(desde C++11)

Replaces the managed object.

Given current_ptr, the pointer that was managed by *this, performs the following actions, in this order:

  1. Saves a copy of the current pointer old_ptr = current_ptr
  2. Overwrites the current pointer with the argument current_ptr = ptr
  3. If the old pointer was non-empty, deletes the previously managed object if(old_ptr != nullptr) get_deleter()(old_ptr).

Contenido

[editar] Parámetros

ptr - pointer to a new object to manage

[editar] Valor de retorno

(Ninguno)
Original:
(none)
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[editar] Notas

To replace the managed object while supplying a new deleter as well, move assignment operator may be used.

A test for self-reset, i.e. whether ptr points to an object already managed by *this, is not performed, except where provided as a compiler extension or as a debugging assert. Note that code such as p.reset(p.release()) does not involve self-reset, only code like p.reset(p.get()) does.

[editar] Ejemplo

#include <iostream>
#include <memory>
 
struct Foo {
    Foo() { std::cout << "Foo...\n"; }
    ~Foo() { std::cout << "~Foo...\n"; }
};
 
struct D {
    void operator() (Foo* p) {
        std::cout << "Calling delete for Foo object... \n";
        delete p;
    }
};
 
int main()
{
    std::cout << "Creating new Foo...\n";
    std::unique_ptr<Foo, D> up(new Foo(), D());  // up owns the Foo pointer (deleter D)
 
    std::cout << "Replace owned Foo with a new Foo...\n";
    up.reset(new Foo());  // calls deleter for the old one
 
    std::cout << "Release and delete the owned Foo...\n";
    up.reset(nullptr);      
}

Salida:

Creating new Foo...
Foo...
Replace owned Foo with a new Foo...
Foo...
Calling delete for Foo object...
~Foo...
Release and delete the owned Foo...
Calling delete for Foo object...
~Foo...

[editar] Ver también

devuelve un puntero al objeto administrado y libera la propiedad
Original:
returns a pointer to the managed object and releases the ownership
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(función miembro público) [editar]