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

From cppreference.com
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C++ named requirements
 

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

[edit] Requirements

The type It satisfies ConstexprIterator if all operations provided to meet It's iterator category requirements are constexpr functions.

[edit] Standard library

The following standard library types are ConstexprIterators.