Namespaces
Variants
Views
Actions

std::discard_block_engine

From cppreference.com
< cpp‎ | numeric‎ | random
 
 
 
Pseudo-random number generation
Uniform random bit generators
Engines and engine adaptors
discard_block_engine
(C++11)
Non-deterministic generator
Distributions
Uniform distributions
Bernoulli distributions
Poisson distributions
Normal distributions
Sampling distributions
Seed Sequences
(C++11)
C library
 
std::discard_block_engine
 
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.

Contents

[edit] Template parameters

Engine - the type of the wrapped engine.
P - the size of a block. Expected that P > 0.
R - the number of used numbers per block. Expected that 0 < R ≤ P.
Type requirements
-
Engine must meet the requirements of RandomNumberEngine.

[edit] Member types

Member type Definition
result_type(C++11) Engine::result_type

[edit] Member functions

constructs the engine adaptor
(public member function) [edit]
(C++11)
sets the state of the underlying engine
(public member function) [edit]
(C++11)
returns the underlying engine
(public member function) [edit]
Generation
advances the state of the underlying engine and returns the generated value
(public member function) [edit]
(C++11)
advances the adaptor's state by a specified amount
(public member function) [edit]
Characteristics
[static] (C++11)
gets the smallest possible value in the output range of the underlying engine.
(public static member function) [edit]
[static] (C++11)
gets the largest possible value in the output range of the underlying engine.
(public static member function) [edit]

[edit] Non-member functions

(C++11)(C++11)(removed in C++20)
compares the internal states of the adaptors and underlying engines
(function) [edit]
performs stream input and output on pseudo-random number engine adaptor
(function) [edit]

[edit] Member constants

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)