Program Listing for File ArrayBatch.h

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#pragma once

#include <tuple>
#include "Array.h"
#include "Types.h"

namespace Azura {
namespace Memory {
class Allocator;
}

namespace Containers {
namespace Impl {
template <U32 Index, typename... BatchProperties>
struct Get;

template <typename First, typename... Rest>
struct Get<0, First, Rest...> {
  Get() = delete;
  typedef First Type;
};

template <U32 Index, typename First, typename... Rest>
struct Get<Index, First, Rest...> {
  Get() = delete;
  typedef typename Get<Index - 1, Rest...>::Type Type;
};
}  // namespace Impl

template <U32 NumElements, typename... BatchProperties>
class ArrayBatch {
  template <U32 Index>
  using Type = typename Impl::Get<Index, BatchProperties...>::Type;

 public:
  explicit ArrayBatch(Memory::Allocator &alloc);

  template <U32 Index>
  Array<Type<Index>, NumElements> &Get();

  template <U32 Index>
  const Array<Type<Index>, NumElements> &Get() const;

 private:
  std::tuple<Array<BatchProperties, NumElements>...> mData;
  SizeType mElements{NumElements};
};

template <U32 NumElements, typename... BatchProperties>
ArrayBatch<NumElements, BatchProperties...>::ArrayBatch(Memory::Allocator &alloc)
    : mData(Array<BatchProperties, NumElements>(alloc)...) {}

template <U32 NumElements, typename... BatchProperties>
template <U32 Index>
Array<typename Impl::Get<Index, BatchProperties...>::Type, NumElements>
    &ArrayBatch<NumElements, BatchProperties...>::Get() {
  return std::get<Index>(mData);
}

template <U32 NumElements, typename... BatchProperties>
template <U32 Index>
const Array<typename Impl::Get<Index, BatchProperties...>::Type, NumElements>
    &ArrayBatch<NumElements, BatchProperties...>::Get() const {
  return std::get<Index>(mData);
}
}  // namespace Containers
}  // namespace Azura