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operator<,<=,>,>=(std::basic_const_iterator<Iter>)

template< /*not-a-const-iterator*/ I >
friend constexpr bool operator<( const I& x, const basic_const_iterator& y )
    requires std::random_access_iterator<Iter> && std::totally_ordered_with<Iter, I>;
 (1) (since C++23) 
template< /*not-a-const-iterator*/ I >
friend constexpr bool operator>( const I& x, const basic_const_iterator& y )
    requires std::random_access_iterator<Iter> && std::totally_ordered_with<Iter, I>;
 (2) (since C++23) 
template< /*not-a-const-iterator*/ I >
friend constexpr bool operator<=( const I& x, const basic_const_iterator& y )
    requires std::random_access_iterator<Iter> && std::totally_ordered_with<Iter, I>;
 (3) (since C++23) 
template< /*not-a-const-iterator*/ I >
friend constexpr bool operator>=( const I& x, const basic_const_iterator& y )
    requires std::random_access_iterator<Iter> && std::totally_ordered_with<Iter, I>;
 (4) (since C++23)

Compare a basic_const_iterator with another value. These function templates are used when the left operand is not a basic_const_iterator.

I satisfies the exposition-only concept /*not-a-const-iterator*/ if and only if it's not a specialization of basic_const_iterator.

These functions are not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when basic_const_iterator<Iter> is an associated class of the arguments.

Parameters

x, y - iterators to compare

Return value

1) x < y.base()
2) x > y.base()
3) x <= y.base()
4) x >= y.base()

Notes

If the left operand is a basic_const_iterator, the member comparison functions are used.

Example

#include <iterator>
 
int main()
{
    static int arr[1];
    static constexpr std::basic_const_iterator<int*> it = std::end(arr);
    static_assert(arr < it);
}

See also

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https://en.cppreference.com/w/cpp/iterator/basic_const_iterator/operator_cmp2