std::discard_block_engine
From cppreference.com
Defined in header <random>


template< class Engine, 
(since C++11)  
discard_block_engine
is a pseudorandom 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
(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) 
[edit] Nonmember functions
(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 pseudorandom number engine adaptor (function) 
[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) 