| Defined in header <random> | ||
|---|---|---|
template<
class Engine,
size_t P, size_t R
> class discard_block_engine; | (since C++11) |
discard_block_engine is a pseudo-random number generator adapter that discards a certain amount of data produced by the base engine. From each block of size P generated by the base engine, the adaptor keeps only R numbers, discarding the rest.
Template parameters
| Engine | - | the type of the wrapped engine |
| P | - | the size of a block. Must be greater than 0. |
| R | - | the number of used numbers per block. Must be greater than 0 and not greater than P |
| Type requirements | ||
- Engine must meet the requirements of RandomNumberEngine. | ||
Member types
| Member type | Definition |
|---|---|
result_type | Engine::result_type |
Member functions
| constructs the engine adaptor (public member function) | |
| sets the state of the underlying engine (public member function) | |
| returns the underlying engine (public member function) | |
Generation | |
| operator()
| advances the state of the underlying engine and returns the generated value (public member function) |
| advances the adaptor's state by a specified amount (public member function) | |
Characteristics | |
| [static] | gets the smallest possible value in the output range of the underlying engine. (public static member function) |
| [static] | gets the largest possible value in the output range of the underlying engine. (public static member function) |
Non-member functions
| compares the internal states of the adaptors and underlying engines (function) | |
| performs stream input and output on pseudo-random number engine adaptor (function) |
Member objects
| constexpr size_t block_size [static] | the size of the block, P (public static member constant) |
| constexpr size_t used_size [static] | the number of used numbers per block, R (public static member constant) |
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