split_span.hpp

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#ifndef EAGINE_MEMORY_SPLIT_SPAN_HPP
#define EAGINE_MEMORY_SPLIT_SPAN_HPP
 
#include "span_algo.hpp"
 
namespace eagine::memory {
//------------------------------------------------------------------------------
template <
  typename ValueType,
  typename Pointer = ValueType*,
  typename SizeType = span_size_t>
class basic_split_span {
public:
    constexpr basic_split_span() noexcept = default;
 
    constexpr basic_split_span(
      basic_span<ValueType, Pointer, SizeType> spn) noexcept
      : _span{spn} {}
 
    constexpr auto split_position() const noexcept -> span_size_t {
        return _split;
    }
 
    constexpr auto head() const noexcept {
        return head(_span, _split);
    }
 
    constexpr auto tail() const noexcept {
        return skip(_span, _split);
    }
 
    auto advance(span_size_t amount) noexcept -> auto& {
        _split += amount;
        return *this;
    }
 
    auto skip_to_end() noexcept -> auto& {
        _split = _span.size();
        return *this;
    }
 
private:
    basic_span<ValueType, Pointer, SizeType> _span{};
    span_size_t _split{0};
};
//------------------------------------------------------------------------------
} // namespace eagine::memory
 
#endif // EAGINE_MEMORY_SPLIT_SPAN_HPP