operator<<,>>(std::discard_block_engine)

 

C++

Language

Standard Library Headers

Freestanding and hosted implementations

Named requirements

Language support library

Concepts library (C++20)

Diagnostics library

Utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Filesystem library (C++17)

Technical Specifications

 

Numerics library

Common mathematical functions

Special mathematical functions

Floating-point environment (C++11)

Complex numbers

Numeric arrays

Pseudo-random number generation

Compile-time rational arithmetic (C++11)

Numeric algorithms

gcd (C++17)

lcm (C++17)

Interpolations

midpoint (C++20)

lerp (C++20)

Generic numeric operations

iota (C++11)

accumulate

inner_product

adjacent_difference

partial_sum

reduce (C++17)

transform_reduce (C++17)

inclusive_scan (C++17)

exclusive_scan (C++17)

transform_inclusive_scan (C++17)

transform_exclusive_scan (C++17)

Bit operations

bit_cast (C++20)

ispow2 (C++20)

ceil2 (C++20)

floor2 (C++20)

log2p1 (C++20)

 

Pseudo-random number generation

Uniform random bit generators

UniformRandomBitGenerator (C++20)

Engines and engine adaptors

linear_congruential_engine (C++11)

mersenne_twister_engine (C++11)

subtract_with_carry_engine (C++11)

discard_block_engine (C++11)

independent_bits_engine (C++11)

shuffle_order_engine (C++11)

Non-deterministic generator

random_device (C++11)

Distributions

Uniform distributions

uniform_int_distribution (C++11)

uniform_real_distribution (C++11)

generate_canonical (C++11)

Bernoulli distributions

bernoulli_distribution (C++11)

binomial_distribution (C++11)

negative_binomial_distribution (C++11)

geometric_distribution (C++11)

Poisson distributions

poisson_distribution (C++11)

exponential_distribution (C++11)

gamma_distribution (C++11)

weibull_distribution (C++11)

extreme_value_distribution (C++11)

Normal distributions

normal_distribution (C++11)

lognormal_distribution (C++11)

chi_squared_distribution (C++11)

cauchy_distribution (C++11)

fisher_f_distribution (C++11)

student_t_distribution (C++11)

Sampling distributions

discrete_distribution (C++11)

piecewise_constant_distribution (C++11)

piecewise_linear_distribution (C++11)

Seed Sequences

seed_seq (C++11)

C library

rand

srand

RAND_MAX

 

std::discard_block_engine

Member functions

discard_block_engine::discard_block_engine

discard_block_engine::seed

discard_block_engine::base

Generation

discard_block_engine::operator()

discard_block_engine::discard

Characteristics

discard_block_engine::min

discard_block_engine::max

Non-member functions

operator==operator!=

operator<<operator>>

 

template< class CharT, class Traits,           class Engine, size_t p, size_t r > std::basic_ostream<CharT,Traits>&     operator<<( std::basic_ostream<CharT,Traits>& ost,                 const std::discard_block_engine<Engine,p,r>& e );	(1)	(since C++11)
template< class CharT, class Traits,           class Engine, size_t p, size_t r > std::basic_istream<CharT,Traits>&     operator>>( std::basic_istream<CharT,Traits>& ist,                 std::discard_block_engine<Engine,p,r>& e );	(2)	(since C++11)

1) Serializes the internal state of the pseudo-random number engine adaptor as a sequence of decimal numbers separated by one or more spaces, and inserts it to the stream ost. The fill character and the formatting flags of the stream are ignored and unaffected.

2) Restores the internal state of the pseudo-random number engine adaptor e from the serialized representation, which was created by an earlier call to operator<< using a stream with the same imbued locale and the same CharT and Traits. If the input cannot be deserialized, e is left unchanged and failbit is raised on ist

If a textual representation is written using os << x and that representation is restored into the same or a different object y of the same type using is >> y, then x==y.

Parameters

ost	-	output stream to insert the data to
ist	-	input stream to extract the data from
e	-	engine adaptor to serialize or restore

Return value

1) ost

2) ist

Exceptions

1) (none)

2) May throw std::ios::failure when setting failbit