C++ named requirements: LegacyContiguousIterator (since C++17)

 

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C++ named requirements

Basic
DefaultConstructible CopyAssignable	CopyConstructible MoveAssignable (C++11)	MoveConstructible (C++11) Destructible
Type properties
ScalarType TriviallyCopyable (C++11)	StandardLayoutType (C++11) PODType	TrivialType (C++11) ImplicitLifetimeType
Library-Wide
EqualityComparable LessThanComparable Swappable ValueSwappable (C++11)	NullablePointer (C++11) Hash (C++11) Allocator FunctionObject	Callable Predicate BinaryPredicate Compare
Container
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
LegacyIterator LegacyOutputIterator LegacyInputIterator	LegacyForwardIterator LegacyBidirectionalIterator LegacyRandomAccessIterator	LegacyContiguousIterator (C++17) ConstexprIterator (C++20)
Stream I/O
FormattedInputFunction UnformattedInputFunction	FormattedOutputFunction	UnformattedOutputFunction
Formatters
BasicFormatter (C++20)	Formatter (C++20)
Random Numbers
SeedSequence (C++11) RandomNumberEngine (C++11)	RandomNumberDistribution (C++11) UniformRandomBitGenerator (C++11)	RandomNumberEngineAdaptor (C++11)
Concurrency
BasicLockable (C++11) Lockable (C++11) TimedLockable (C++11)	SharedLockable (C++14) SharedTimedLockable (C++14) Mutex (C++11)	TimedMutex (C++11) SharedMutex (C++17) SharedTimedMutex (C++14)
Ranges
RangeAdaptorObject (C++20)	RangeAdaptorClosureObject (C++20)
Other
CharTraits RegexTraits (C++11) BitmaskType LiteralType (C++11)	NumericType UnaryTypeTrait (C++11) BinaryTypeTrait (C++11) TransformationTrait (C++11)	Clock (C++11) TrivialClock (C++11)

 

A LegacyContiguousIterator is a LegacyIterator whose logically adjacent elements are also physically adjacent in memory.

A pointer to an element of an array satisfies all requirements of LegacyContiguousIterator.

Requirements

The type It satisfies LegacyContiguousIterator if

• The type It satisfies LegacyIterator

And, for every

• a, a dereferenceable iterator of type It
• n, an integral value

such that

• a + n is a valid and dereferenceable iterator value

then

• *(a + n) is equivalent to *(std::addressof(*a) + n).

Standard library

The following standard library types are LegacyContiguousIterators.

• array::iterator.
• basic_string_view::iterator.
• basic_string::iterator.
• vector::iterator for value_type other than bool.
• The return type of begin(valarray) and end(valarray).

Notes

Fancy pointer to object types are also required to satisfy LegacyContiguousIterator.

LegacyContiguousIterator is replaced with the contiguous_iterator concept: iterator types in the standard library that are required to satisfy LegacyContiguousIterator in C++17 are required to model contiguous_iterator in C++20.

(since C++20)

See also

contiguous_iterator (C++20)	specifies that a random_access_iterator is a contiguous iterator, referring to elements that are contiguous in memory (concept)
Iterator library	provides definitions for iterators, iterator traits, adaptors, and utility functions