Make ring_iterator::operator- a member, templated on is_const

martinmoene / ring-span-lite

ring-span lite - A C++yy-like ring_span type for C++98, C++11 and later in a single-file header-only library

Boost Software License 1.0

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Closed martinmoene closed 7 years ago

martinmoene commented 7 years ago

template< bool C >
difference_type operator-( ring_iterator<RS, C> const & rhs) const nsrs_noexcept;

And add:

friend class ring_iterator<RS, !is_const>;

martinmoene commented 7 years ago

friend class ring_iterator<RS, !is_const>;

added in ed8ba65eda7db56a0b44842b26c67e0c9c2dde84