Defined in header <random> | ||
|---|---|---|
template<
class Engine,
std::size_t P, std::size_t R
> class discard_block_engine;
| (since C++11) |
discard_block_engine is a pseudo-random number engine adaptor 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.
| Engine | - | the type of the wrapped engine. |
| P | - | the size of a block. Expected that \(\small{P>0}\)P > 0. |
| R | - | the number of used numbers per block. Expected that \(\small{0<R\le P}\)0 < R ≤ P. |
| Type requirements | ||
-Engine must meet the requirements of RandomNumberEngine. |
||
| Member type | Definition |
|---|---|
result_type (C++11) | Engine::result_type |
|
(C++11) | constructs the engine adaptor (public member function) |
|
(C++11) | sets the state of the underlying engine (public member function) |
|
(C++11) | returns the underlying engine (public member function) |
Generation |
|
|
(C++11) | advances the state of the underlying engine and returns the generated value (public member function) |
|
(C++11) | advances the adaptor's state by a specified amount (public member function) |
Characteristics |
|
|
[static] (C++11) | gets the smallest possible value in the output range of the underlying engine. (public static member function) |
|
[static] (C++11) | gets the largest possible value in the output range of the underlying engine. (public static member function) |
|
(C++11)(C++11)(removed in C++20) | compares the internal states of the adaptors and underlying engines (function) |
|
(C++11) | performs stream input and output on pseudo-random number engine adaptor (function) |
| constexpr size_t block_size
[static] (C++11) | the size of the block, P (public static member constant) |
| constexpr size_t used_block
[static] (C++11) | the number of used numbers per block, R (public static member constant) |
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