get_temporary_buffer

Artikel
07/29/2015

Allocates temporary storage for a sequence of elements that does not exceed a specified number of elements.

template<class Type> 
   pair<Type *, ptrdiff_t> 
      get_temporary_buffer( 
         ptrdiff_t _Count 
      );

Parameters

_Count
The maximum number of elements requested for which memory is to be allocated.

Return Value

A pair whose first component is a pointer to the memory that was allocated, and whose second component gives the size of the buffer, indicating the largest number of elements that it could store.

Remarks

The function makes a request for memory and it may not succeed. If no buffer is allocated, then the function returns a pair, with the second component equal to zero and the first component equal to the null pointer.

This function should only be used for memory that is temporary.

Example

// memory_get_temp_buf.cpp
// compile with: /EHsc
#include <memory>
#include <iostream>

using namespace std;

int main( )
{
   // Create an array of ints
   int intArray [ ] = { 10, 20, 30, 40, 100, 200, 300, 1000, 2000 };
   int count = sizeof ( intArray ) / sizeof ( int );
   cout << "The number of integers in the array is: " 
      << count << "." << endl;

   pair<int *, ptrdiff_t> resultPair;
   resultPair = get_temporary_buffer<int>( count );

   cout << "The number of elements that the allocated memory\n"
        << "could store is given by: resultPair.second = " 
        << resultPair.second << "." << endl;
}

The number of integers in the array is: 9.
The number of elements that the allocated memory
could store is given by: resultPair.second = 9.

Requirements

Header: <memory>

Namespace: std

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