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

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C++
Numerics library
Pseudo-random number generation
Random number distributions
Uniform distributions
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Bernoulli distributions
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Poisson distributions
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Normal distributions
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Sampling distributions
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std::discard_block_engine
template < class CharT, class Traits >

friend std:: basic_ostream < CharT,Traits > &
operator << ( std:: basic_ostream < CharT,Traits > & ost,

discard_block_engine <> & e ) ;
(1) (since C++11)
template < class CharT, class Traits >

friend std:: basic_istream < CharT,Traits > &
operator >> ( std:: basic_istream < CharT,Traits > & ist,

discard_block_engine & 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 .

These function templates are not visible to ordinary unqualified or qualified lookup , and can only be found by argument-dependent lookup when std::discard_block_engine<Engine, p, r> is an associated class of the arguments.

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 .

This section is incomplete
Reason: standard also defines what the textual representation consists of

Contents

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

Complexity

This section is incomplete

Exceptions

1) May throw implementation-defined exceptions.
2) May throw std::ios_base::failure when setting failbit .

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior
LWG 3519 C++11 the form of insertion and extraction operators were unspecified specified to be hidden friends