allocator::allocator

Constructors used to create allocator objects.

allocator( ); 
allocator( 
   const allocator<Type>& _Right 
); 
template<class Other> 
   allocator( 
      const allocator<Other>& _Right 
   );

매개 변수

• _Right
  The allocator object to be copied.

설명

The constructor does nothing. In general, however, an allocator object constructed from another allocator object should compare equal to it and permit intermixing of object allocation and freeing between the two allocator objects.

예제

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

using namespace std;

class Int {
public:
   Int( int i ) 
   {
      cout << "Constructing " << ( void* )this  << endl; 
      x = i;
      bIsConstructed = true;
   };
   ~Int( ) 
   {
      cout << "Destructing " << ( void* )this << endl; 
      bIsConstructed = false;
   };
   Int &operator++( ) 
   {
      x++;
      return *this;
   };
   int x;
private:
   bool bIsConstructed;
};

int main( ) 
{
   allocator<double> Alloc;
   vector <Int>:: allocator_type v1Alloc;

   allocator<double> cAlloc(Alloc); 
   allocator<Int> cv1Alloc(v1Alloc);

   if ( cv1Alloc == v1Alloc )
      cout << "The allocator objects cv1Alloc & v1Alloc are equal."
           << endl;
   else
      cout << "The allocator objects cv1Alloc & v1Alloc are not equal."
           << endl;

   if ( cAlloc == Alloc )
      cout << "The allocator objects cAlloc & Alloc are equal."
           << endl;
   else
      cout << "The allocator objects cAlloc & Alloc are not equal."
           << endl;
}

요구 사항

헤더 <memory>

네임스페이스: std

참고 항목

참조

allocator 클래스