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std::get_temporary_buffer

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< cpp‎ | memory

 
 
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Defined in header <memory>
template< class T >
std::pair< T*, std::ptrdiff_t > get_temporary_buffer( std::ptrdiff_t count )
Aloca armazenamento suficiente para armazenar até count objetos adjacentes de T tipo. Se não houver memória suficiente para todos os objetos count, aloca menos de count, se possível.
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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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Índice

[editar] Parâmetros

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

Uma std::pair mantendo um ponteiro para o início do armazenamento alocado e o número de objectos que se encaixam no armazenamento que foi efectivamente reservada (pode ser zero).
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] Exceções

noexcept specification:  
noexcept
  (a partir do C++ 11)

[editar] Exemplo

[edit]
#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);
}

Output:

string
1
test
...

[editar] Veja também

liberta de armazenamento não inicializado
Original:
frees uninitialized storage
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(modelo de função) [edit]