operator<<,>>(std::philox_engine)
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std::philox_engine
Member functions
Generation
Characteristics
Non-member functions
(C++26)
operator<<operator>>
(C++26)(C++26)
template< class CharT, class Traits >
(1)
(since C++26)
friend std::basic_ostream <CharT, Traits>&
operator<<( std::basic_ostream <CharT, Traits>& os,
template< class CharT, class Traits >
(2)
(since C++26)
friend std::basic_istream <CharT, Traits>&
operator>>( std::basic_istream <CharT, Traits>& is,
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.
[edit] Parameters
os
-
output stream to insert the data to
is
-
input stream to extract the data from
e
-
pseudo-random number engine
[edit] Return value
1) os
2) is
[edit] Complexity
1,2) \(\scriptsize O(n) \)O(n).