C++ concepts: SeedSequence

 

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Technical Specifications

 

C++ concepts

Basic
DefaultConstructible CopyAssignable CopyConstructible	MoveAssignable (C++11) MoveConstructible (C++11) Destructible
Layout
TrivialType (C++11) TriviallyCopyable (C++11)	StandardLayoutType (C++11) PODType
Library-Wide
EqualityComparable LessThanComparable Swappable (C++11) ValueSwappable (C++11)	NullablePointer (C++11) Hash (C++11) Allocator
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Container SequenceContainer ContiguousContainer (C++17) ReversibleContainer	AssociativeContainer AllocatorAwareContainer UnorderedAssociativeContainer (C++11)
Container Elements
DefaultInsertable (C++11) CopyInsertable (C++11) MoveInsertable (C++11)	EmplaceConstructible (C++11) Erasable (C++11)
Iterator
Iterator OutputIterator InputIterator	ForwardIterator BidirectionalIterator RandomAccessIterator ContiguousIterator (C++17)
Stream I/O
FormattedInputFunction UnformattedInputFunction	FormattedOutputFunction UnformattedOutputFunction
Random Numbers
SeedSequence (C++11) RandomNumberEngine (C++11)	RandomNumberDistribution (C++11) UniformRandomNumberGenerator (C++11) RandomNumberEngineAdaptor (C++11)
Concurrency
BasicLockable (C++11) Lockable (C++11) TimedLockable (C++11)	Mutex (C++11) TimedMutex (C++11) SharedMutex (C++17) SharedTimedMutex (C++14)
Other
CharTraits pos_type off_type Clock (C++11) BitmaskType	UnaryTypeTrait (C++11) BinaryTypeTrait (C++11) TransformationTrait (C++11) TrivialClock (C++11) LiteralType (C++11)

 

A seed sequence is an object that produces unsigned integer values i in the range 0 ≤ i < 232
based on a consumed range of integer data.

Requirements

• S is a SeedSequence.
• q is an object of S and r is a potentially constant object of S.
• T is the result_type.
• ib,ie are InputIterators with a value_type of unsigned integer values of at least 32 bits.
• il is an std::initializer_list<T>.
• rb,re are mutable RandomAccessIterators with a value_type of unsigned integer values of at least 32 bits.
• ob is an OutputIterator.

Expression	Type	Notes	Complexity
S::result_type	T	Unsigned integer of at least 32 bits	compile-time
S()		Creates a seed sequence with the same default values as other objects of type S	constant
S(ib,ie)		Creates a seed sequence based on the supplied input bits by [ib,ie)	O(ie-ib)
S(il)		The same as S(il.begin(), il.end())
q.generate(rb,re)	void	Fills [rb,re) with 32-bit quantities depending on the initial supplied values and potential previous calls to generate. If it does nothing.	O(re-rb)
r.size()	size_t	The amount of 32-bit integers copied by param.	constant
r.param(ob)	void	Copies 32-bit values to ob that would reproduce the current state of the object if passed to a constructor of S.	O(r.size())

See also

• std::seed_seq