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std::get_temporary_buffer

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< cpp‎ | memory

 
 
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
Original:
Uninitialized storage
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get_temporary_buffer
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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Definido en la cabecera <memory>
template< class T >
std::pair< T*, std::ptrdiff_t > get_temporary_buffer( std::ptrdiff_t count )
Asigna almacenamiento suficiente para almacenar hasta count objetos adyacentes de T tipo. Si no hay suficiente memoria para todos los objetos count, asigna menos de count, si es posible .
Original:
Allocates storage sufficient to store up to count adjacent objects of type T. If there is insufficient memory for all count objects, allocates less than count, if possible.
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Contenido

[editar] Parámetros

count -
el número de objetos para asignar
Original:
the number of objects to allocate
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[editar] Valor de retorno

Un std::pair sostiene un puntero al comienzo del almacenamiento asignado y el número de objetos que se ajustan en el almacenamiento que se ha asignado realmente (que puede ser cero) .
Original:
An std::pair holding a pointer to the beginning of the allocated storage and the number of objects that fit in the storage that was actually allocated (may be zero).
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[editar] Excepciones

noexcept specification:  
noexcept
  (desde C++11)

[editar] Ejemplo

[editar]
#include <algorithm>
#include <iostream>
#include <memory>
#include <string>
 
int main()
{
    const std::string s[] = {"string", "1", "test", "..."};
    std::string* p = std::get_temporary_buffer<std::string>(4).first;
 
    std::copy(std::begin(s), std::end(s),
              std::raw_storage_iterator<std::string*, std::string>(p));
 
    for (std::string* i = p; i != p+4; ++i) {
        std::cout << *i << '\n';
        i->~basic_string<char>();
    }
    std::return_temporary_buffer(p);
}

Salida:

string
1
test
...

[editar] Ver también

libera almacenamiento sin inicializar
Original:
frees uninitialized storage
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(plantilla de función) [editar]