std::get_temporary_buffer

Defined in header <memory>
template< class T > std::pair< T*, std::ptrdiff_t > get_temporary_buffer( std::ptrdiff_t count )

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.

Parameters

count

-

the number of objects to allocate

Return value

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).

Exceptions

noexcept specification:  

noexcept

  (since C++11)

Example

run this code

#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
...

See also

return_temporary_buffer	frees uninitialized storage (function template)