offset_span.hpp

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#ifndef EAGINE_MEMORY_OFFSET_SPAN_HPP
#define EAGINE_MEMORY_OFFSET_SPAN_HPP
 
#include "offset_ptr.hpp"
#include "span.hpp"
 
namespace eagine::memory {
//------------------------------------------------------------------------------
template <typename T, typename O = span_size_t, typename S = span_size_t>
using basic_offset_span = memory::basic_span<T, basic_offset_ptr<T, O>, S>;
//------------------------------------------------------------------------------
template <typename T>
using offset_span = basic_offset_span<T>;
//------------------------------------------------------------------------------
template <typename T, typename O>
auto view_one(basic_offset_ptr<T, O> ptr) -> memory::
  basic_span<std::add_const_t<T>, basic_offset_ptr<std::add_const_t<T>, O>, O> {
    return {ptr, O(1)};
}
//------------------------------------------------------------------------------
template <typename T, typename O>
auto cover_one(basic_offset_ptr<T, O> ptr) -> std::enable_if_t<
  !std::is_const_v<T>,
  memory::basic_span<T, basic_offset_ptr<T, O>, O>> {
    return {ptr, O(1)};
}
//------------------------------------------------------------------------------
template <typename T, typename P, typename S>
static constexpr auto relative(basic_span<T, P, S> spn) noexcept
  -> basic_span<T, basic_offset_ptr<T, std::make_signed_t<S>>, S> {
    return {spn};
}
//------------------------------------------------------------------------------
} // namespace eagine::memory
 
#endif // EAGINE_MEMORY_OFFSET_SPAN_HPP