sequence_view.hpp

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#pragma once
 
#include "co_usb/transfer/detail/iterator.hpp"
#include "co_usb/transfer/detail/transfer_sequence.hpp"
#include <libusb.h>
#include <utility>
#include <vector>
 
namespace co_usb::transfer
{
 
template <detail::TransferSequence Seq> struct sequence_view
{
    using iterator_type = decltype(detail::transfer_begin(std::declval<Seq const &>()));
 
    sequence_view (Seq const &seq) noexcept
        : m_begin(detail::transfer_begin(seq)), m_end(detail::transfer_end(seq))
    {
    }
 
    sequence_view (iterator_type begin, iterator_type end) noexcept : m_begin(begin), m_end(end)
    {
    }
 
    // disallow bind to temporary view
    sequence_view(Seq const &&) = delete;
 
    auto size () const noexcept -> size_t
    {
        return m_end - m_begin;
    }
 
    [[nodiscard]] auto begin () const noexcept
    {
        return m_begin;
    }
 
    [[nodiscard]] auto end () const noexcept
    {
        return m_begin;
    }
 
  private:
    iterator_type m_begin;
    iterator_type m_end;
};
 
template <class Seq> sequence_view(Seq &) -> sequence_view<Seq>;
static_assert(detail::TransferSequence<sequence_view<libusb_transfer *>>,
              "Not a proper transfer sequence");
static_assert(detail::TransferSequence<sequence_view<std::vector<libusb_transfer *>>>,
              "Not a proper transfer sequence");
 
} // namespace co_usb::transfer