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 all operations provided to meet It 's iterator category requirements are constexpr functions.

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