C++ named requirements: ConstexprIterator

 

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C++ named requirements

Basic DefaultConstructible MoveConstructible (C++11) CopyConstructible CopyAssignable MoveAssignable (C++11) Destructible Type properties ScalarType PODType TriviallyCopyable (C++11) TrivialType (C++11) StandardLayoutType (C++11)   ImplicitLifetimeType Library-wide BooleanTestable EqualityComparable LessThanComparable Swappable ValueSwappable (C++11) NullablePointer (C++11) Hash (C++11) Allocator FunctionObject Callable Predicate BinaryPredicate Compare

Container Container ReversibleContainer AllocatorAwareContainer SequenceContainer ContiguousContainer (C++17) AssociativeContainer UnorderedAssociativeContainer (C++11)   Container element DefaultInsertable (C++11) CopyInsertable (C++11) MoveInsertable (C++11) EmplaceConstructible (C++11) Erasable (C++11) Iterator LegacyIterator LegacyInputIterator LegacyOutputIterator LegacyForwardIterator LegacyBidirectionalIterator LegacyRandomAccessIterator LegacyContiguousIterator (C++17) ConstexprIterator (C++20) Stream I/O FormattedInputFunction UnformattedInputFunction FormattedOutputFunction UnformattedOutputFunction Formatters BasicFormatter (C++20) Formatter (C++20)

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A ConstexprIterator is a LegacyIterator that can be used during constant expression evaluation.

Requirements

The type It satisfies ConstexprIterator if

• The type It satisfies some iterator requirements MeowIterator

And, for every

• purr, an operation on It that is required to be supported by MeowIterator,
• kittens..., a set of arguments to purr that meets the requirements for that operation,

Then

• purr(kittens...) may be used in a constant expression if kittens... can also be used.

Standard library

The following standard library types are ConstexprIterators.

• array::iterator and array::const_iterator.
• basic_string_view::iterator.
• span::iterator.
• vector::iterator and vector::const_iterator.

See also

Iterator library

provides definitions for iterators, iterator traits, adaptors, and utility functions