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#pragma once
#include <cstddef>
#include <iterator>
#include <stdexcept>
#include <type_traits>
// TODO(JTS): We really should just use gsl::span
template <typename T>
class span {
// TODO(JTS): Finish this to make it useful
public:
using element_type = T;
using index_type = size_t;
using pointer = T*;
using reference = T&;
using value = std::remove_cv_t<T>;
protected:
pointer _storage{};
index_type _count{};
public:
span() = default;
span(std::nullptr_t) noexcept : span() {}
span(pointer p, index_type n) noexcept : _storage{p}, _count{n} {}
template <size_t N>
span(element_type (&arr)[N]) noexcept : span(arr, N) {}
span(pointer first, pointer last) noexcept
: span(first, std::distance(first, last)) {}
index_type count() const noexcept { return _count; }
bool valid() const noexcept { return _storage != nullptr; }
pointer data() const noexcept { return _storage; }
};
struct memory_view : public span<char> {
using span::span;
template <typename T>
T* as() const {
// if ((size_t) count() < sizeof(T)) {
// throw std::runtime_error("not enough space");
//}
return reinterpret_cast<T*>(_storage);
}
};
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