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#ifndef INCLUDED_PLACEMENTALLOC_H_
#define INCLUDED_PLACEMENTALLOC_H_
#include <ostream>
template<typename Data>
class PlacementAlloc: public std::allocator<Data>
{
template<typename IData>
friend std::ostream &operator<<(std::ostream &out,
PlacementAlloc<IData> const &alloc);
Data *d_data;
static char s_commonPool[];
static char *s_free;
public:
PlacementAlloc();
PlacementAlloc(Data const &data);
PlacementAlloc(PlacementAlloc<Data> const &other);
~PlacementAlloc();
operator Data &();
PlacementAlloc &operator=(Data const &data);
private:
char *request();
};
template<typename Data>
char PlacementAlloc<Data>::s_commonPool[1000];
template<typename Data>
char *PlacementAlloc<Data>::s_free =
PlacementAlloc<Data>::s_commonPool;
template<typename Data>
PlacementAlloc<Data>::PlacementAlloc()
:
d_data(0)
{}
template<typename Data>
PlacementAlloc<Data>::PlacementAlloc(Data const &data)
:
d_data(new(request()) Data(data))
{}
template<typename Data>
PlacementAlloc<Data>::PlacementAlloc(PlacementAlloc<Data> const &other)
:
d_data(new(request()) Data(*other.d_data))
{}
template<typename Data>
PlacementAlloc<Data>::~PlacementAlloc()
{
d_data->~Data();
}
template<typename Data>
PlacementAlloc<Data>::operator Data &()
{
return *d_data;
}
template<typename Data>
PlacementAlloc<Data> &PlacementAlloc<Data>::operator=(Data const &data)
{
*d_data = data;
}
template<typename Data>
char *PlacementAlloc<Data>::request()
{
char *cp = s_free;
s_free += sizeof(Data);
return cp;
}
template<typename IData>
inline std::ostream &operator<<(std::ostream &out,
PlacementAlloc<IData> const &alloc)
{
return out << *alloc.d_data;
}
#endif
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