discard_block Class
Discards portions of a random sequence.
template<class Engine,
int P, int R>
class discard_block {
public:
typedef discard_block<Engine, P, R> _MyT;
typedef Engine base_type;
typedef typename base_type::result_type result_type;
static const int block_size = P;
static const int used_block = R;
discard_block();
discard_block(const discard_block& right);
discard_block(discard_block& right);
explicit discard_block(const base_type& eng);
explicit discard_block(result_type seed);
template<class Gen>
discard_block(Gen& gen);
void seed();
template<class Gen>
void seed(Gen& gen);
const base_type& base() const;
result_type min() const;
result_type max() const;
result_type operator()();
private:
Engine stored_eng; // exposition only
int count; // exposition only
};
Parameters
Engine
The stored random engine type.P
The total block size.R
The used block size.
Remarks
The template class decribes a compound engine that produces values by discarding some of the values returned by its base engine. Each cycle of the compound engine begins by returning R values successively produced by the base engine and ends by discarding P - R such values. The engine's state is the state of stored_eng followed by the number of calls to operator() that have occurred since the beginning of the current cycle.
The value of the template argument R must be less than or equal to the value of the template argument P.
Requirements
Header: <random>
Namespace: std::tr1