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Showing content from https://en.cppreference.com/w/cpp/language/../string/../named_req/ContiguousIterator.html below:

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

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.

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).

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).

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.

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