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

From cppreference.com

C++
Numerics library
Common mathematical functions
Mathematical special functions (C++17)
Mathematical constants (C++20)
Basic linear algebra algorithms (C++26)
Data-parallel types ( simd ) (C++26)
Floating-point environment (C++11)
Complex numbers
Numeric array ( valarray )
Pseudo-random number generation
Factor operations
(C++17)
(C++17)
Interpolations
(C++20)
(C++20)
Saturation arithmetic
(C++26)
(C++26)
(C++26)
(C++26)
(C++26)

Generic numeric operations
Bit operations
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
Pseudo-random number generation
Random number distributions
Uniform distributions
(C++11)
(C++11)
(C++11)
Bernoulli distributions
(C++11)
(C++11)
(C++11)
(C++11)
Poisson distributions
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
Normal distributions
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
Sampling distributions
(C++11)
(C++11)
(C++11)
std::philox_engine
template < class CharT, class Traits >

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

const philox_engine & e ) ;
(1) (since C++26)
template < class CharT, class Traits >

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

philox_engine & e ) ;
(2) (since C++26)
1) Writes the textual representation of the current state of e to os with fmtflags set to std:: ios_base :: dec | std:: ios_base :: left and the fill character set to the space character.
After writing, os 's original fmtflags and fill character are restored.
2) Reads a textual representation of engine state from is (denoted as text ) with fmtflags set to std:: ios_base :: dec , and sets the state of e to that state.
After reading, is 's original fmtflags is restored.
  • If text was not previously written using an output stream pr , the behavior is undefined.
  • Otherwise, if any of the following values is false , the behavior is undefined:
  • is. getloc ( ) == pr. getloc ( )
  • std:: is_same < decltype ( is ) :: char_type ,
    decltype ( pr ) :: char_type > :: value
  • std:: is_same < decltype ( is ) :: traits_type ,
    decltype ( pr ) :: traits_type > :: value
  • Otherwise, if text is not a valid textual representation of any state of decltype ( e ) , the state of e is unchanged and is. setstate ( std:: ios_base :: failbit ) is called.
  • Otherwise, given another engine eng of the same type as e . If text was previously written by pr << eng and there is no intervening invocations of e or of eng between pr << eng and is >> e , e == eng is true .

These function templates are not visible to ordinary unqualified or qualified lookup , and can only be found by argument-dependent lookup when decltype ( e ) is an associated class of the arguments.

Parameters

os - output stream to insert the data to
is - input stream to extract the data from
e - pseudo-random number engine

Return value

1) os
2) is

Complexity

1,2) O(n) .

Exceptions

2) May throw std::ios_base::failure when setting std:: ios_base :: failbit .
Retrieved from " https://en.cppreference.com/mwiki/index.php?title=cpp/numeric/random/philox_engine/operator_ltltgtgt&oldid=175503 "