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class Cache{
public:
typedef double& proxy ;
typedef double* iterator ;
Cache( iterator data_) : data(data_){}
inline proxy ref(int i){ return data[i] ; }
inline proxy ref(int i) const { return data[i] ; }
private:
iterator data ;
} ;
class Vec {
public:
typedef double& proxy ;
Vec( double* data_ ) : cache(data_){}
inline proxy operator[]( int i){ return cache.ref(i) ; }
inline proxy operator[]( int i) const { return cache.ref(i) ; }
private:
Cache cache ;
} ;
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