C++ named requirements: ConstexprIterator (since C++20)

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 ConstexprIterator s .

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

optional::iterator and optional::const_iterator

(since C++26)

See also

Iterator library

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