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Difference between revisions of "cpp/numeric/random/shuffle order engine/operator ltltgtgt"

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Latest revision as of 14:08, 7 August 2021

[edit template]
 
C++
 
Numerics library
 
Pseudo-random number generation
 
std::shuffle_order_engine
 
template< class CharT, class Traits >

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

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

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

                shuffle_order_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::shuffle_order_engine<Engine, k> 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

[edit] Parameters

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

[edit] Return value

1) ost
2) ist

[edit] Complexity

This section is incomplete

[edit] Exceptions

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

[edit] 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
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