Array.h

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#ifndef ZSERIO_ARRAY_H_INC
#define ZSERIO_ARRAY_H_INC
 
#include <cstdlib>
#include <type_traits>
 
#include "zserio/AllocatorPropagatingCopy.h"
#include "zserio/ArrayTraits.h"
#include "zserio/BitSizeOfCalculator.h"
#include "zserio/BitStreamReader.h"
#include "zserio/BitStreamWriter.h"
#include "zserio/DeltaContext.h"
#include "zserio/SizeConvertUtil.h"
#include "zserio/Traits.h"
#include "zserio/UniquePtr.h"
 
namespace zserio
{
 
namespace detail
{
 
// array expressions for arrays which do not need expressions
struct DummyArrayExpressions
{};
 
// array owner for arrays which do not need the owner
struct DummyArrayOwner
{};
 
// helper trait to choose the owner type for an array from combination of ARRAY_TRAITS and ARRAY_EXPRESSIONS
template <typename ARRAY_TRAITS, typename ARRAY_EXPRESSIONS, typename = void>
struct array_owner_type
{
    using type = DummyArrayOwner;
};
 
template <typename ARRAY_TRAITS, typename ARRAY_EXPRESSIONS>
struct array_owner_type<ARRAY_TRAITS, ARRAY_EXPRESSIONS,
        typename std::enable_if<has_owner_type<ARRAY_TRAITS>::value>::type>
{
    using type = typename ARRAY_TRAITS::OwnerType;
};
 
template <typename ARRAY_TRAITS, typename ARRAY_EXPRESSIONS>
struct array_owner_type<ARRAY_TRAITS, ARRAY_EXPRESSIONS,
        typename std::enable_if<!has_owner_type<ARRAY_TRAITS>::value &&
                has_owner_type<ARRAY_EXPRESSIONS>::value>::type>
{
    using type = typename ARRAY_EXPRESSIONS::OwnerType;
};
 
// helper trait to choose packing context type for an array from an element type T
template <typename T, typename = void>
struct packing_context_type
{
    using type = DeltaContext;
};
 
template <typename T>
struct packing_context_type<T, typename std::enable_if<has_zserio_packing_context<T>::value>::type>
{
    using type = typename T::ZserioPackingContext;
};
 
// calls the initializeOffset static method on ARRAY_EXPRESSIONS if available
template <typename ARRAY_EXPRESSIONS, typename OWNER_TYPE,
        typename std::enable_if<has_initialize_offset<ARRAY_EXPRESSIONS>::value, int>::type = 0>
void initializeOffset(OWNER_TYPE& owner, size_t index, size_t bitPosition)
{
    ARRAY_EXPRESSIONS::initializeOffset(owner, index, bitPosition);
}
 
template <typename ARRAY_EXPRESSIONS, typename OWNER_TYPE,
        typename std::enable_if<!has_initialize_offset<ARRAY_EXPRESSIONS>::value, int>::type = 0>
void initializeOffset(OWNER_TYPE&, size_t, size_t)
{}
 
// calls the checkOffset static method on ARRAY_EXPRESSIONS if available
template <typename ARRAY_EXPRESSIONS, typename OWNER_TYPE,
        typename std::enable_if<has_check_offset<ARRAY_EXPRESSIONS>::value, int>::type = 0>
void checkOffset(const OWNER_TYPE& owner, size_t index, size_t bitPosition)
{
    ARRAY_EXPRESSIONS::checkOffset(owner, index, bitPosition);
}
 
template <typename ARRAY_EXPRESSIONS, typename OWNER_TYPE,
        typename std::enable_if<!has_check_offset<ARRAY_EXPRESSIONS>::value, int>::type = 0>
void checkOffset(const OWNER_TYPE&, size_t, size_t)
{}
 
// call the initContext method properly on packed array traits
template <typename PACKED_ARRAY_TRAITS, typename OWNER_TYPE, typename PACKING_CONTEXT,
        typename std::enable_if<has_owner_type<PACKED_ARRAY_TRAITS>::value, int>::type = 0>
void packedArrayTraitsInitContext(
        const OWNER_TYPE& owner, PACKING_CONTEXT& context, typename PACKED_ARRAY_TRAITS::ElementType element)
{
    PACKED_ARRAY_TRAITS::initContext(owner, context, element);
}
 
template <typename PACKED_ARRAY_TRAITS, typename OWNER_TYPE, typename PACKING_CONTEXT,
        typename std::enable_if<!has_owner_type<PACKED_ARRAY_TRAITS>::value, int>::type = 0>
void packedArrayTraitsInitContext(
        const OWNER_TYPE&, PACKING_CONTEXT& context, typename PACKED_ARRAY_TRAITS::ElementType element)
{
    PACKED_ARRAY_TRAITS::initContext(context, element);
}
 
// calls the bitSizeOf method properly on array traits which have constant bit size
template <typename ARRAY_TRAITS, typename OWNER_TYPE,
        typename std::enable_if<ARRAY_TRAITS::IS_BITSIZEOF_CONSTANT && has_owner_type<ARRAY_TRAITS>::value,
                int>::type = 0>
size_t arrayTraitsConstBitSizeOf(const OWNER_TYPE& owner)
{
    return ARRAY_TRAITS::bitSizeOf(owner);
}
 
template <typename ARRAY_TRAITS, typename OWNER_TYPE,
        typename std::enable_if<ARRAY_TRAITS::IS_BITSIZEOF_CONSTANT && !has_owner_type<ARRAY_TRAITS>::value,
                int>::type = 0>
size_t arrayTraitsConstBitSizeOf(const OWNER_TYPE&)
{
    return ARRAY_TRAITS::bitSizeOf();
}
 
// calls the bitSizeOf method properly on array traits which haven't constant bit size
template <typename ARRAY_TRAITS, typename OWNER_TYPE,
        typename std::enable_if<has_owner_type<ARRAY_TRAITS>::value, int>::type = 0>
size_t arrayTraitsBitSizeOf(
        const OWNER_TYPE& owner, size_t bitPosition, const typename ARRAY_TRAITS::ElementType& element)
{
    return ARRAY_TRAITS::bitSizeOf(owner, bitPosition, element);
}
 
template <typename ARRAY_TRAITS, typename OWNER_TYPE,
        typename std::enable_if<!has_owner_type<ARRAY_TRAITS>::value, int>::type = 0>
size_t arrayTraitsBitSizeOf(
        const OWNER_TYPE&, size_t bitPosition, const typename ARRAY_TRAITS::ElementType& element)
{
    return ARRAY_TRAITS::bitSizeOf(bitPosition, element);
}
 
// calls the bitSizeOf method properly on packed array traits which haven't constant bit size
template <typename PACKED_ARRAY_TRAITS, typename OWNER_TYPE, typename PACKING_CONTEXT,
        typename std::enable_if<has_owner_type<PACKED_ARRAY_TRAITS>::value, int>::type = 0>
size_t packedArrayTraitsBitSizeOf(const OWNER_TYPE& owner, PACKING_CONTEXT& context, size_t bitPosition,
        const typename PACKED_ARRAY_TRAITS::ElementType& element)
{
    return PACKED_ARRAY_TRAITS::bitSizeOf(owner, context, bitPosition, element);
}
 
template <typename PACKED_ARRAY_TRAITS, typename OWNER_TYPE, typename PACKING_CONTEXT,
        typename std::enable_if<!has_owner_type<PACKED_ARRAY_TRAITS>::value, int>::type = 0>
size_t packedArrayTraitsBitSizeOf(const OWNER_TYPE&, PACKING_CONTEXT& context, size_t bitPosition,
        const typename PACKED_ARRAY_TRAITS::ElementType& element)
{
    return PACKED_ARRAY_TRAITS::bitSizeOf(context, bitPosition, element);
}
 
// calls the initializeOffsets method properly on array traits
template <typename ARRAY_TRAITS, typename OWNER_TYPE,
        typename std::enable_if<has_owner_type<ARRAY_TRAITS>::value, int>::type = 0>
size_t arrayTraitsInitializeOffsets(
        OWNER_TYPE& owner, size_t bitPosition, typename ARRAY_TRAITS::ElementType& element)
{
    return ARRAY_TRAITS::initializeOffsets(owner, bitPosition, element);
}
 
template <typename ARRAY_TRAITS, typename OWNER_TYPE,
        typename std::enable_if<!has_owner_type<ARRAY_TRAITS>::value &&
                        !std::is_scalar<typename ARRAY_TRAITS::ElementType>::value,
                int>::type = 0>
size_t arrayTraitsInitializeOffsets(
        OWNER_TYPE&, size_t bitPosition, const typename ARRAY_TRAITS::ElementType& element)
{
    return ARRAY_TRAITS::initializeOffsets(bitPosition, element);
}
 
template <typename ARRAY_TRAITS, typename OWNER_TYPE,
        typename std::enable_if<!has_owner_type<ARRAY_TRAITS>::value &&
                        std::is_scalar<typename ARRAY_TRAITS::ElementType>::value,
                int>::type = 0>
size_t arrayTraitsInitializeOffsets(OWNER_TYPE&, size_t bitPosition, typename ARRAY_TRAITS::ElementType element)
{
    return ARRAY_TRAITS::initializeOffsets(bitPosition, element);
}
 
// calls the initializeOffsets method properly on packed array traits
template <typename PACKED_ARRAY_TRAITS, typename OWNER_TYPE, typename PACKING_CONTEXT,
        typename std::enable_if<has_owner_type<PACKED_ARRAY_TRAITS>::value, int>::type = 0>
size_t packedArrayTraitsInitializeOffsets(OWNER_TYPE& owner, PACKING_CONTEXT& context, size_t bitPosition,
        typename PACKED_ARRAY_TRAITS::ElementType& element)
{
    return PACKED_ARRAY_TRAITS::initializeOffsets(owner, context, bitPosition, element);
}
 
template <typename PACKED_ARRAY_TRAITS, typename OWNER_TYPE, typename PACKING_CONTEXT,
        typename std::enable_if<!has_owner_type<PACKED_ARRAY_TRAITS>::value &&
                        !std::is_scalar<typename PACKED_ARRAY_TRAITS::ElementType>::value,
                int>::type = 0>
size_t packedArrayTraitsInitializeOffsets(OWNER_TYPE&, PACKING_CONTEXT& context, size_t bitPosition,
        const typename PACKED_ARRAY_TRAITS::ElementType& element)
{
    return PACKED_ARRAY_TRAITS::initializeOffsets(context, bitPosition, element);
}
 
template <typename PACKED_ARRAY_TRAITS, typename OWNER_TYPE, typename PACKING_CONTEXT,
        typename std::enable_if<!has_owner_type<PACKED_ARRAY_TRAITS>::value &&
                        std::is_scalar<typename PACKED_ARRAY_TRAITS::ElementType>::value,
                int>::type = 0>
size_t packedArrayTraitsInitializeOffsets(OWNER_TYPE&, PACKING_CONTEXT& context, size_t bitPosition,
        typename PACKED_ARRAY_TRAITS::ElementType element)
{
    return PACKED_ARRAY_TRAITS::initializeOffsets(context, bitPosition, element);
}
 
// calls the read method properly on array traits
template <typename ARRAY_TRAITS, typename OWNER_TYPE, typename RAW_ARRAY,
        typename std::enable_if<has_owner_type<ARRAY_TRAITS>::value && !has_allocator<ARRAY_TRAITS>::value,
                int>::type = 0>
void arrayTraitsRead(const OWNER_TYPE& owner, RAW_ARRAY& rawArray, BitStreamReader& in, size_t index)
{
    rawArray.push_back(ARRAY_TRAITS::read(owner, in, index));
}
 
template <typename ARRAY_TRAITS, typename OWNER_TYPE, typename RAW_ARRAY,
        typename std::enable_if<has_owner_type<ARRAY_TRAITS>::value && has_allocator<ARRAY_TRAITS>::value,
                int>::type = 0>
void arrayTraitsRead(OWNER_TYPE& owner, RAW_ARRAY& rawArray, BitStreamReader& in, size_t index)
{
    ARRAY_TRAITS::read(owner, rawArray, in, index);
}
 
template <typename ARRAY_TRAITS, typename OWNER_TYPE, typename RAW_ARRAY,
        typename std::enable_if<!has_owner_type<ARRAY_TRAITS>::value && !has_allocator<ARRAY_TRAITS>::value,
                int>::type = 0>
void arrayTraitsRead(const OWNER_TYPE&, RAW_ARRAY& rawArray, BitStreamReader& in, size_t index)
{
    rawArray.push_back(ARRAY_TRAITS::read(in, index));
}
 
template <typename ARRAY_TRAITS, typename OWNER_TYPE, typename RAW_ARRAY,
        typename std::enable_if<!has_owner_type<ARRAY_TRAITS>::value && has_allocator<ARRAY_TRAITS>::value,
                int>::type = 0>
void arrayTraitsRead(const OWNER_TYPE&, RAW_ARRAY& rawArray, BitStreamReader& in, size_t index)
{
    ARRAY_TRAITS::read(rawArray, in, index);
}
 
// calls the read method properly on packed array traits
template <typename PACKED_ARRAY_TRAITS, typename OWNER_TYPE, typename RAW_ARRAY, typename PACKING_CONTEXT,
        typename std::enable_if<has_owner_type<PACKED_ARRAY_TRAITS>::value &&
                        has_allocator<PACKED_ARRAY_TRAITS>::value,
                int>::type = 0>
void packedArrayTraitsRead(
        OWNER_TYPE& owner, RAW_ARRAY& rawArray, PACKING_CONTEXT& context, BitStreamReader& in, size_t index)
{
    PACKED_ARRAY_TRAITS::read(owner, rawArray, context, in, index);
}
 
template <typename PACKED_ARRAY_TRAITS, typename OWNER_TYPE, typename RAW_ARRAY, typename PACKING_CONTEXT,
        typename std::enable_if<has_owner_type<PACKED_ARRAY_TRAITS>::value &&
                        !has_allocator<PACKED_ARRAY_TRAITS>::value,
                int>::type = 0>
void packedArrayTraitsRead(const OWNER_TYPE& owner, RAW_ARRAY& rawArray, PACKING_CONTEXT& context,
        BitStreamReader& in, size_t index)
{
    rawArray.push_back(PACKED_ARRAY_TRAITS::read(owner, context, in, index));
}
 
// note: types which doesn't have owner and have allocator are never packed (e.g. string, bytes ...)
//       and thus such specialization is not needed
 
template <typename PACKED_ARRAY_TRAITS, typename OWNER_TYPE, typename RAW_ARRAY, typename PACKING_CONTEXT,
        typename std::enable_if<!has_owner_type<PACKED_ARRAY_TRAITS>::value &&
                        !has_allocator<PACKED_ARRAY_TRAITS>::value,
                int>::type = 0>
void packedArrayTraitsRead(
        const OWNER_TYPE&, RAW_ARRAY& rawArray, PACKING_CONTEXT& context, BitStreamReader& in, size_t index)
{
    rawArray.push_back(PACKED_ARRAY_TRAITS::read(context, in, index));
}
 
// call the write method properly on array traits
template <typename ARRAY_TRAITS, typename OWNER_TYPE,
        typename std::enable_if<has_owner_type<ARRAY_TRAITS>::value, int>::type = 0>
void arrayTraitsWrite(
        const OWNER_TYPE& owner, BitStreamWriter& out, const typename ARRAY_TRAITS::ElementType& element)
{
    ARRAY_TRAITS::write(owner, out, element);
}
 
template <typename ARRAY_TRAITS, typename OWNER_TYPE,
        typename std::enable_if<!has_owner_type<ARRAY_TRAITS>::value, int>::type = 0>
void arrayTraitsWrite(
        const OWNER_TYPE&, BitStreamWriter& out, const typename ARRAY_TRAITS::ElementType& element)
{
    ARRAY_TRAITS::write(out, element);
}
 
// call the write method properly on packed array traits
template <typename PACKED_ARRAY_TRAITS, typename OWNER_TYPE, typename PACKING_CONTEXT,
        typename std::enable_if<has_owner_type<PACKED_ARRAY_TRAITS>::value, int>::type = 0>
void packedArrayTraitsWrite(const OWNER_TYPE& owner, PACKING_CONTEXT& context, BitStreamWriter& out,
        const typename PACKED_ARRAY_TRAITS::ElementType& element)
{
    PACKED_ARRAY_TRAITS::write(owner, context, out, element);
}
 
template <typename PACKED_ARRAY_TRAITS, typename OWNER_TYPE, typename PACKING_CONTEXT,
        typename std::enable_if<!has_owner_type<PACKED_ARRAY_TRAITS>::value, int>::type = 0>
void packedArrayTraitsWrite(const OWNER_TYPE&, PACKING_CONTEXT& context, BitStreamWriter& out,
        const typename PACKED_ARRAY_TRAITS::ElementType& element)
{
    PACKED_ARRAY_TRAITS::write(context, out, element);
}
 
} // namespace detail
 
enum ArrayType
{
    NORMAL, 
    IMPLICIT, 
    ALIGNED, 
    AUTO, 
    ALIGNED_AUTO 
};
 
template <typename RAW_ARRAY, typename ARRAY_TRAITS, ArrayType ARRAY_TYPE,
        typename ARRAY_EXPRESSIONS = detail::DummyArrayExpressions>
class Array
{
public:
    using RawArray = RAW_ARRAY;
 
    using ArrayTraits = ARRAY_TRAITS;
 
    using ArrayExpressions = ARRAY_EXPRESSIONS;
 
    using OwnerType = typename detail::array_owner_type<ArrayTraits, ArrayExpressions>::type;
 
    using allocator_type = typename RawArray::allocator_type;
 
    explicit Array(const allocator_type& allocator = allocator_type()) :
            m_rawArray(allocator)
    {}
 
    explicit Array(const RawArray& rawArray) :
            m_rawArray(rawArray)
    {}
 
    explicit Array(RawArray&& rawArray) :
            m_rawArray(std::move(rawArray))
    {}
 
    ~Array() = default;
    Array(const Array& other) = default;
    Array& operator=(const Array& other) = default;
    Array(Array&& other) = default;
    Array& operator=(Array&& other) = default;
    template <typename T = typename RAW_ARRAY::value_type,
            typename std::enable_if<std::is_constructible<T, NoInitT, T>::value, int>::type = 0>
    Array(NoInitT, const Array& other) :
            Array(std::allocator_traits<allocator_type>::select_on_container_copy_construction(
                    other.m_rawArray.get_allocator()))
    {
        m_rawArray.reserve(other.m_rawArray.size());
        for (const auto& value : other.m_rawArray)
        {
            m_rawArray.emplace_back(NoInit, value);
        }
    }
 
    template <typename T = typename RAW_ARRAY::value_type,
            typename std::enable_if<std::is_constructible<T, NoInitT, T>::value, int>::type = 0>
    Array& assign(NoInitT, const Array& other)
    {
        const RawArray rawArray(other.m_rawArray.get_allocator());
        m_rawArray = rawArray; // copy assign to get correct allocator propagation behaviour
        m_rawArray.reserve(other.m_rawArray.size());
        for (const auto& value : other.m_rawArray)
        {
            m_rawArray.emplace_back(NoInit, value);
        }
 
        return *this;
    }
 
    template <typename T = typename RAW_ARRAY::value_type,
            typename std::enable_if<std::is_constructible<T, NoInitT, T>::value, int>::type = 0>
    Array(NoInitT, Array&& other) :
            Array(std::move(other))
    {}
 
    template <typename T = typename RAW_ARRAY::value_type,
            typename std::enable_if<std::is_constructible<T, NoInitT, T>::value, int>::type = 0>
    Array& assign(NoInitT, Array&& other)
    {
        return operator=(std::move(other));
    }
 
    Array(PropagateAllocatorT, const Array& other, const allocator_type& allocator) :
            m_rawArray(allocatorPropagatingCopy(other.m_rawArray, allocator))
    {}
 
    template <typename T = typename RAW_ARRAY::value_type,
            typename std::enable_if<std::is_constructible<T, NoInitT, T>::value, int>::type = 0>
    Array(PropagateAllocatorT, NoInitT, const Array& other, const allocator_type& allocator) :
            m_rawArray(allocatorPropagatingCopy(NoInit, other.m_rawArray, allocator))
    {}
 
    bool operator==(const Array& other) const
    {
        return m_rawArray == other.m_rawArray;
    }
 
    bool operator<(const Array& other) const
    {
        return m_rawArray < other.m_rawArray;
    }
 
    uint32_t hashCode() const
    {
        return calcHashCode(HASH_SEED, m_rawArray);
    }
 
    const RawArray& getRawArray() const
    {
        return m_rawArray;
    }
 
    RawArray& getRawArray()
    {
        return m_rawArray;
    }
 
    template <typename ARRAY_EXPRESSIONS_ = ArrayExpressions,
            typename std::enable_if<has_initialize_element<ARRAY_EXPRESSIONS_>::value, int>::type = 0>
    void initializeElements(OwnerType& owner)
    {
        size_t index = 0;
        for (auto&& element : m_rawArray)
        {
            ArrayExpressions::initializeElement(owner, element, index);
            index++;
        }
    }
 
    template <typename OWNER_TYPE_ = OwnerType,
            typename std::enable_if<std::is_same<OWNER_TYPE_, detail::DummyArrayOwner>::value, int>::type = 0>
    size_t bitSizeOf(size_t bitPosition) const
    {
        return bitSizeOfImpl(detail::DummyArrayOwner(), bitPosition);
    }
 
    template <typename OWNER_TYPE_ = OwnerType,
            typename std::enable_if<!std::is_same<OWNER_TYPE_, detail::DummyArrayOwner>::value, int>::type = 0>
    size_t bitSizeOf(const OwnerType& owner, size_t bitPosition) const
    {
        return bitSizeOfImpl(owner, bitPosition);
    }
 
    template <typename OWNER_TYPE_ = OwnerType,
            typename std::enable_if<std::is_same<OWNER_TYPE_, detail::DummyArrayOwner>::value, int>::type = 0>
    size_t initializeOffsets(size_t bitPosition)
    {
        detail::DummyArrayOwner owner;
        return initializeOffsetsImpl(owner, bitPosition);
    }
 
    template <typename OWNER_TYPE_ = OwnerType,
            typename std::enable_if<!std::is_same<OWNER_TYPE_, detail::DummyArrayOwner>::value, int>::type = 0>
    size_t initializeOffsets(OwnerType& owner, size_t bitPosition)
    {
        return initializeOffsetsImpl(owner, bitPosition);
    }
 
    template <typename OWNER_TYPE_ = OwnerType,
            typename std::enable_if<std::is_same<OWNER_TYPE_, detail::DummyArrayOwner>::value, int>::type = 0>
    void read(BitStreamReader& in, size_t arrayLength = 0)
    {
        detail::DummyArrayOwner owner;
        readImpl(owner, in, arrayLength);
    }
 
    template <typename OWNER_TYPE_ = OwnerType,
            typename std::enable_if<!std::is_same<OWNER_TYPE_, detail::DummyArrayOwner>::value, int>::type = 0>
    void read(OwnerType& owner, BitStreamReader& in, size_t arrayLength = 0)
    {
        readImpl(owner, in, arrayLength);
    }
 
    template <typename OWNER_TYPE_ = OwnerType,
            typename std::enable_if<std::is_same<OWNER_TYPE_, detail::DummyArrayOwner>::value, int>::type = 0>
    void write(BitStreamWriter& out) const
    {
        writeImpl(detail::DummyArrayOwner(), out);
    }
 
    template <typename OWNER_TYPE_ = OwnerType,
            typename std::enable_if<!std::is_same<OWNER_TYPE_, detail::DummyArrayOwner>::value, int>::type = 0>
    void write(const OwnerType& owner, BitStreamWriter& out) const
    {
        writeImpl(owner, out);
    }
 
    template <typename OWNER_TYPE_ = OwnerType,
            typename std::enable_if<std::is_same<OWNER_TYPE_, detail::DummyArrayOwner>::value, int>::type = 0>
    size_t bitSizeOfPacked(size_t bitPosition) const
    {
        return bitSizeOfPackedImpl(detail::DummyArrayOwner(), bitPosition);
    }
 
    template <typename OWNER_TYPE_ = OwnerType,
            typename std::enable_if<!std::is_same<OWNER_TYPE_, detail::DummyArrayOwner>::value, int>::type = 0>
    size_t bitSizeOfPacked(const OwnerType& ownerType, size_t bitPosition) const
    {
        return bitSizeOfPackedImpl(ownerType, bitPosition);
    }
 
    template <typename OWNER_TYPE_ = OwnerType,
            typename std::enable_if<std::is_same<OWNER_TYPE_, detail::DummyArrayOwner>::value, int>::type = 0>
    size_t initializeOffsetsPacked(size_t bitPosition)
    {
        detail::DummyArrayOwner owner;
        return initializeOffsetsPackedImpl(owner, bitPosition);
    }
 
    template <typename OWNER_TYPE_ = OwnerType,
            typename std::enable_if<!std::is_same<OWNER_TYPE_, detail::DummyArrayOwner>::value, int>::type = 0>
    size_t initializeOffsetsPacked(OwnerType& owner, size_t bitPosition)
    {
        return initializeOffsetsPackedImpl(owner, bitPosition);
    }
 
    template <typename OWNER_TYPE_ = OwnerType,
            typename std::enable_if<std::is_same<OWNER_TYPE_, detail::DummyArrayOwner>::value, int>::type = 0>
    void readPacked(BitStreamReader& in, size_t arrayLength = 0)
    {
        detail::DummyArrayOwner owner;
        readPackedImpl(owner, in, arrayLength);
    }
 
    template <typename OWNER_TYPE_ = OwnerType,
            typename std::enable_if<!std::is_same<OWNER_TYPE_, detail::DummyArrayOwner>::value, int>::type = 0>
    void readPacked(OwnerType& owner, BitStreamReader& in, size_t arrayLength = 0)
    {
        readPackedImpl(owner, in, arrayLength);
    }
 
    template <typename OWNER_TYPE_ = OwnerType,
            typename std::enable_if<std::is_same<OWNER_TYPE_, detail::DummyArrayOwner>::value, int>::type = 0>
    void writePacked(BitStreamWriter& out) const
    {
        writePackedImpl(detail::DummyArrayOwner(), out);
    }
 
    template <typename OWNER_TYPE_ = OwnerType,
            typename std::enable_if<!std::is_same<OWNER_TYPE_, detail::DummyArrayOwner>::value, int>::type = 0>
    void writePacked(const OwnerType& owner, BitStreamWriter& out) const
    {
        writePackedImpl(owner, out);
    }
 
private:
    template <ArrayType ARRAY_TYPE_ = ARRAY_TYPE,
            typename std::enable_if<ARRAY_TYPE_ != ArrayType::AUTO && ARRAY_TYPE_ != ArrayType::ALIGNED_AUTO,
                    int>::type = 0>
    static void addBitSizeOfArrayLength(size_t&, size_t)
    {}
 
    template <ArrayType ARRAY_TYPE_ = ARRAY_TYPE,
            typename std::enable_if<ARRAY_TYPE_ == ArrayType::AUTO || ARRAY_TYPE_ == ArrayType::ALIGNED_AUTO,
                    int>::type = 0>
    static void addBitSizeOfArrayLength(size_t& bitPosition, size_t arrayLength)
    {
        bitPosition += bitSizeOfVarSize(convertSizeToUInt32(arrayLength));
    }
 
    template <ArrayType ARRAY_TYPE_ = ARRAY_TYPE,
            typename std::enable_if<ARRAY_TYPE_ != ArrayType::ALIGNED && ARRAY_TYPE_ != ArrayType::ALIGNED_AUTO,
                    int>::type = 0>
    static void alignBitPosition(size_t&)
    {}
 
    template <ArrayType ARRAY_TYPE_ = ARRAY_TYPE,
            typename std::enable_if<ARRAY_TYPE_ == ArrayType::ALIGNED || ARRAY_TYPE_ == ArrayType::ALIGNED_AUTO,
                    int>::type = 0>
    static void alignBitPosition(size_t& bitPosition)
    {
        bitPosition = alignTo(8, bitPosition);
    }
 
    template <typename IO, typename OWNER_TYPE, ArrayType ARRAY_TYPE_ = ARRAY_TYPE,
            typename std::enable_if<ARRAY_TYPE_ != ArrayType::ALIGNED && ARRAY_TYPE_ != ArrayType::ALIGNED_AUTO,
                    int>::type = 0>
    static void alignAndCheckOffset(IO&, OWNER_TYPE&, size_t)
    {}
 
    template <typename IO, typename OWNER_TYPE, ArrayType ARRAY_TYPE_ = ARRAY_TYPE,
            typename std::enable_if<ARRAY_TYPE_ == ArrayType::ALIGNED || ARRAY_TYPE_ == ArrayType::ALIGNED_AUTO,
                    int>::type = 0>
    static void alignAndCheckOffset(IO& io, OWNER_TYPE& owner, size_t index)
    {
        io.alignTo(8);
        detail::checkOffset<ArrayExpressions>(owner, index, io.getBitPosition() / 8);
    }
 
    template <ArrayType ARRAY_TYPE_ = ARRAY_TYPE,
            typename std::enable_if<ARRAY_TYPE_ != ArrayType::ALIGNED && ARRAY_TYPE_ != ArrayType::ALIGNED_AUTO,
                    int>::type = 0>
    static void initializeOffset(OwnerType&, size_t, size_t&)
    {}
 
    template <ArrayType ARRAY_TYPE_ = ARRAY_TYPE,
            typename std::enable_if<ARRAY_TYPE_ == ArrayType::ALIGNED || ARRAY_TYPE_ == ArrayType::ALIGNED_AUTO,
                    int>::type = 0>
    static void initializeOffset(OwnerType& owner, size_t index, size_t& bitPosition)
    {
        bitPosition = alignTo(8, bitPosition);
        detail::initializeOffset<ArrayExpressions>(owner, index, bitPosition / 8);
    }
 
    template <ArrayType ARRAY_TYPE_ = ARRAY_TYPE,
            typename std::enable_if<ARRAY_TYPE_ != ArrayType::AUTO && ARRAY_TYPE_ != ArrayType::ALIGNED_AUTO &&
                            ARRAY_TYPE_ != ArrayType::IMPLICIT,
                    int>::type = 0>
    static size_t readArrayLength(OwnerType&, BitStreamReader&, size_t arrayLength)
    {
        return arrayLength;
    }
 
    template <ArrayType ARRAY_TYPE_ = ARRAY_TYPE,
            typename std::enable_if<ARRAY_TYPE_ == ArrayType::AUTO || ARRAY_TYPE_ == ArrayType::ALIGNED_AUTO,
                    int>::type = 0>
    static size_t readArrayLength(OwnerType&, BitStreamReader& in, size_t)
    {
        return in.readVarSize();
    }
 
    template <ArrayType ARRAY_TYPE_ = ARRAY_TYPE,
            typename std::enable_if<ARRAY_TYPE_ == ArrayType::IMPLICIT, int>::type = 0>
    static size_t readArrayLength(OwnerType& owner, BitStreamReader& in, size_t)
    {
        static_assert(ARRAY_TYPE != ArrayType::IMPLICIT || ArrayTraits::IS_BITSIZEOF_CONSTANT,
                "Implicit array elements must have constant bit size!");
 
        const size_t remainingBits = in.getBufferBitSize() - in.getBitPosition();
        return remainingBits / detail::arrayTraitsConstBitSizeOf<ArrayTraits>(owner);
    }
 
    template <ArrayType ARRAY_TYPE_ = ARRAY_TYPE,
            typename std::enable_if<ARRAY_TYPE_ != ArrayType::AUTO && ARRAY_TYPE_ != ArrayType::ALIGNED_AUTO,
                    int>::type = 0>
    static void writeArrayLength(BitStreamWriter&, size_t)
    {}
 
    template <ArrayType ARRAY_TYPE_ = ARRAY_TYPE,
            typename std::enable_if<ARRAY_TYPE_ == ArrayType::AUTO || ARRAY_TYPE_ == ArrayType::ALIGNED_AUTO,
                    int>::type = 0>
    static void writeArrayLength(BitStreamWriter& out, size_t arrayLength)
    {
        out.writeVarSize(convertSizeToUInt32(arrayLength));
    }
 
    template <ArrayType ARRAY_TYPE_ = ARRAY_TYPE,
            typename std::enable_if<ARRAY_TYPE_ != ArrayType::ALIGNED && ARRAY_TYPE_ != ArrayType::ALIGNED_AUTO,
                    int>::type = 0>
    static size_t constBitSizeOfElements(size_t, size_t arrayLength, size_t elementBitSize)
    {
        return arrayLength * elementBitSize;
    }
 
    template <ArrayType ARRAY_TYPE_ = ARRAY_TYPE,
            typename std::enable_if<ARRAY_TYPE_ == ArrayType::ALIGNED || ARRAY_TYPE_ == ArrayType::ALIGNED_AUTO,
                    int>::type = 0>
    static size_t constBitSizeOfElements(size_t bitPosition, size_t arrayLength, size_t elementBitSize)
    {
        size_t endBitPosition = alignTo(8, bitPosition);
        endBitPosition += elementBitSize + (arrayLength - 1) * alignTo(8, elementBitSize);
 
        return endBitPosition - bitPosition;
    }
 
    template <typename ARRAY_TRAITS_ = ArrayTraits,
            typename std::enable_if<ARRAY_TRAITS_::IS_BITSIZEOF_CONSTANT, int>::type = 0>
    size_t bitSizeOfImpl(const OwnerType& owner, size_t bitPosition) const
    {
        size_t endBitPosition = bitPosition;
 
        const size_t arrayLength = m_rawArray.size();
        addBitSizeOfArrayLength(endBitPosition, arrayLength);
 
        if (arrayLength > 0)
        {
            const size_t elementBitSize = detail::arrayTraitsConstBitSizeOf<ArrayTraits>(owner);
            endBitPosition += constBitSizeOfElements(endBitPosition, arrayLength, elementBitSize);
        }
 
        return endBitPosition - bitPosition;
    }
 
    template <typename ARRAY_TRAITS_ = ArrayTraits,
            typename std::enable_if<!ARRAY_TRAITS_::IS_BITSIZEOF_CONSTANT, int>::type = 0>
    size_t bitSizeOfImpl(const OwnerType& owner, size_t bitPosition) const
    {
        size_t endBitPosition = bitPosition;
 
        const size_t arrayLength = m_rawArray.size();
        addBitSizeOfArrayLength(endBitPosition, arrayLength);
 
        for (size_t index = 0; index < arrayLength; ++index)
        {
            alignBitPosition(endBitPosition);
            endBitPosition +=
                    detail::arrayTraitsBitSizeOf<ArrayTraits>(owner, endBitPosition, m_rawArray[index]);
        }
 
        return endBitPosition - bitPosition;
    }
 
    size_t initializeOffsetsImpl(OwnerType& owner, size_t bitPosition)
    {
        size_t endBitPosition = bitPosition;
 
        const size_t arrayLength = m_rawArray.size();
        addBitSizeOfArrayLength(endBitPosition, arrayLength);
 
        for (size_t index = 0; index < arrayLength; ++index)
        {
            initializeOffset(owner, index, endBitPosition);
            endBitPosition =
                    detail::arrayTraitsInitializeOffsets<ArrayTraits>(owner, endBitPosition, m_rawArray[index]);
        }
 
        return endBitPosition;
    }
 
    void readImpl(OwnerType& owner, BitStreamReader& in, size_t arrayLength)
    {
        size_t readLength = readArrayLength(owner, in, arrayLength);
 
        m_rawArray.clear();
        m_rawArray.reserve(readLength);
        for (size_t index = 0; index < readLength; ++index)
        {
            alignAndCheckOffset(in, owner, index);
            detail::arrayTraitsRead<ArrayTraits>(owner, m_rawArray, in, index);
        }
    }
 
    void writeImpl(const OwnerType& owner, BitStreamWriter& out) const
    {
        const size_t arrayLength = m_rawArray.size();
        writeArrayLength(out, arrayLength);
 
        for (size_t index = 0; index < arrayLength; ++index)
        {
            alignAndCheckOffset(out, owner, index);
            detail::arrayTraitsWrite<ArrayTraits>(owner, out, m_rawArray[index]);
        }
    }
 
    using PackingContext = typename detail::packing_context_type<typename RawArray::value_type>::type;
 
    size_t bitSizeOfPackedImpl(const OwnerType& owner, size_t bitPosition) const
    {
        static_assert(ARRAY_TYPE != ArrayType::IMPLICIT, "Implicit array cannot be packed!");
 
        size_t endBitPosition = bitPosition;
 
        const size_t arrayLength = m_rawArray.size();
        addBitSizeOfArrayLength(endBitPosition, arrayLength);
 
        if (arrayLength > 0)
        {
            PackingContext context;
 
            for (size_t index = 0; index < arrayLength; ++index)
            {
                detail::packedArrayTraitsInitContext<PackedArrayTraits<ArrayTraits>>(
                        owner, context, m_rawArray[index]);
            }
 
            for (size_t index = 0; index < arrayLength; ++index)
            {
                alignBitPosition(endBitPosition);
                endBitPosition += detail::packedArrayTraitsBitSizeOf<PackedArrayTraits<ArrayTraits>>(
                        owner, context, endBitPosition, m_rawArray[index]);
            }
        }
 
        return endBitPosition - bitPosition;
    }
 
    size_t initializeOffsetsPackedImpl(OwnerType& owner, size_t bitPosition)
    {
        static_assert(ARRAY_TYPE != ArrayType::IMPLICIT, "Implicit array cannot be packed!");
 
        size_t endBitPosition = bitPosition;
 
        const size_t arrayLength = m_rawArray.size();
        addBitSizeOfArrayLength(endBitPosition, arrayLength);
 
        if (arrayLength > 0)
        {
            PackingContext context;
 
            for (size_t index = 0; index < arrayLength; ++index)
            {
                detail::packedArrayTraitsInitContext<PackedArrayTraits<ArrayTraits>>(
                        owner, context, m_rawArray[index]);
            }
 
            for (size_t index = 0; index < arrayLength; ++index)
            {
                initializeOffset(owner, index, endBitPosition);
                endBitPosition = detail::packedArrayTraitsInitializeOffsets<PackedArrayTraits<ArrayTraits>>(
                        owner, context, endBitPosition, m_rawArray[index]);
            }
        }
 
        return endBitPosition;
    }
 
    void readPackedImpl(OwnerType& owner, BitStreamReader& in, size_t arrayLength = 0)
    {
        static_assert(ARRAY_TYPE != ArrayType::IMPLICIT, "Implicit array cannot be packed!");
 
        size_t readLength = readArrayLength(owner, in, arrayLength);
 
        m_rawArray.clear();
 
        if (readLength > 0)
        {
            m_rawArray.reserve(readLength);
 
            PackingContext context;
 
            for (size_t index = 0; index < readLength; ++index)
            {
                alignAndCheckOffset(in, owner, index);
                detail::packedArrayTraitsRead<PackedArrayTraits<ArrayTraits>>(
                        owner, m_rawArray, context, in, index);
            }
        }
    }
 
    void writePackedImpl(const OwnerType& owner, BitStreamWriter& out) const
    {
        static_assert(ARRAY_TYPE != ArrayType::IMPLICIT, "Implicit array cannot be packed!");
 
        const size_t arrayLength = m_rawArray.size();
        writeArrayLength(out, arrayLength);
 
        if (arrayLength > 0)
        {
            PackingContext context;
 
            for (size_t index = 0; index < arrayLength; ++index)
            {
                detail::packedArrayTraitsInitContext<PackedArrayTraits<ArrayTraits>>(
                        owner, context, m_rawArray[index]);
            }
 
            for (size_t index = 0; index < arrayLength; ++index)
            {
                alignAndCheckOffset(out, owner, index);
                detail::packedArrayTraitsWrite<PackedArrayTraits<ArrayTraits>>(
                        owner, context, out, m_rawArray[index]);
            }
        }
    }
 
    RawArray m_rawArray;
};
 
template <typename ARRAY, typename RAW_ARRAY>
ARRAY createOptionalArray(RAW_ARRAY&& rawArray)
{
    return ARRAY(std::forward<RAW_ARRAY>(rawArray));
}
 
template <typename ARRAY>
NullOptType createOptionalArray(NullOptType)
{
    return NullOpt;
}
 
} // namespace zserio
 
#endif // ZSERIO_ARRAY_H_INC