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/* Copyright (C) 2013 BMW Group
* Author: Manfred Bathelt (manfred.bathelt@bmw.de)
* Author: Juergen Gehring (juergen.gehring@bmw.de)
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef COMMONAPI_SERIALIZABLE_VARIANT_H_
#define COMMONAPI_SERIALIZABLE_VARIANT_H_
#include <memory>
#include <cstdint>
#include <iostream>
#include <string>
#include <tuple>
#include <type_traits>
#include <cassert>
namespace CommonAPI {
class InputStream;
class OutputStream;
class TypeOutputStream;
template<typename _Type>
struct TypeWriter;
/**
* \brief A variant class which can be serialised by bindings.
*
* A variant class which can be serialised by bindings.
*/
class SerializableVariant {
public:
virtual ~SerializableVariant() {
}
virtual uint8_t getValueType() const = 0;
virtual void readFromInputStream(const uint8_t typeIndex, InputStream& inputStream) = 0;
virtual void writeToOutputStream(OutputStream& outputStream) const = 0;
virtual void writeToTypeOutputStream(TypeOutputStream& typeOutputStream) const = 0;
};
template<typename ... _Types>
struct MaxSize;
template<>
struct MaxSize<> {
static const unsigned int value = 0;
};
template<typename _Type, typename ... _Types>
struct MaxSize<_Type, _Types...> {
static const unsigned int current_type_size = sizeof(_Type);
static const unsigned int next_type_size = MaxSize<_Types...>::value;
static const unsigned int value =
current_type_size > next_type_size ?
current_type_size : next_type_size;
};
template<typename _SearchType, typename ... _RestTypes>
struct VariantTypeSelector;
template<typename _SearchType, typename ... _RestTypes>
struct VariantTypeSelector<_SearchType, _SearchType, _RestTypes...> {
typedef _SearchType type;
};
/**
* \brief A templated generic variant class which provides type safe access and operators
*
* A templated generic variant class which provides type safe access and operators
*/
template<typename ... _Types>
class Variant: public SerializableVariant {
private:
typedef std::tuple_size<std::tuple<_Types...>> TypesTupleSize;
public:
static const unsigned int maxSize = MaxSize<_Types...>::value;
/**
* \brief Construct an empty variant
*
* Construct an empty variant
*/
Variant();
/**
* \brief Copy constructor. Must have identical templates.
*
* Copy constructor. Must have identical templates.
*
* @param fromVariant Variant to copy
*/
Variant(const Variant& fromVariant);
/**
* \brief Copy constructor. Must have identical templates.
*
* Copy constructor. Must have identical templates.
*
* @param fromVariant Variant to copy
*/
Variant(Variant&& fromVariant);
~Variant();
virtual void readFromInputStream(const uint8_t typeIndex, InputStream& inputStream);
virtual void writeToOutputStream(OutputStream& outputStream) const;
virtual void writeToTypeOutputStream(TypeOutputStream& typeOutputStream) const;
/**
* \brief Assignment of another variant. Must have identical templates.
*
* Assignment of another variant. Must have identical templates.
*
* @param rhs Variant to assign
*/
Variant& operator=(const Variant& rhs);
/**
* \brief Assignment of another variant. Must have identical templates.
*
* Assignment of another variant. Must have identical templates.
*
* @param rhs Variant to assign
*/
Variant& operator=(Variant&& rhs);
/**
* \brief Assignment of a contained type. Must be one of the valid templated types.
*
* Assignment of a contained type. Must be one of the valid templated types.
*
* @param value Value to assign
*/
template<typename _Type>
typename std::enable_if<!std::is_same<_Type, Variant<_Types...>>::value, Variant<_Types...>&>::type
operator=(const _Type& value);
/**
* \brief Equality of another variant. Must have identical template list and content.
*
* Equality of another variant. Must have identical template list and content.
*
* @param rhs Variant to compare
*/
bool operator==(const Variant<_Types...>& rhs) const;
/**
* \brief Not-Equality of another variant. Must have identical template list and content.
*
* Not-Equality of another variant. Must have identical template list and content.
*
* @param rhs Variant to compare
*/
bool operator!=(const Variant<_Types...>& rhs) const;
/**
* \brief Testif the contained type is the same as the template on this method.
*
* Testif the contained type is the same as the template on this method.
*
* @return Is same type
*/
template <typename _Type>
const bool isType() const;
/**
* \brief Construct variant with content type set to value.
*
* Construct variant with content type set to value.
*
* @param value Value to place
*/
template <typename _Type>
Variant(const _Type& value,
typename std::enable_if<!std::is_const<_Type>::value>::type* = 0,
typename std::enable_if<!std::is_reference<_Type>::value>::type* = 0,
typename std::enable_if<!std::is_same<_Type, Variant>::value>::type* = 0);
/**
* \brief Construct variant with content type set to value.
*
* Construct variant with content type set to value.
*
* @param value Value to place
*/
template <typename _Type>
Variant(_Type && value,
typename std::enable_if<!std::is_const<_Type>::value>::type* = 0,
typename std::enable_if<!std::is_reference<_Type>::value>::type* = 0,
typename std::enable_if<!std::is_same<_Type, Variant>::value>::type* = 0);
/**
* \brief Get value of variant, template to content type. Throws exception if type is not contained.
*
* Get value of variant, template to content type. Throws exception if type is not contained.
*/
template <typename _Type>
const _Type& get() const;
/**
* \brief Get index in template list of type actually contained, starting at 1 at the end of the template list
*
* Get index in template list of type actually contained, starting at 1 at the end of the template list
*
* @return Index of contained type
*/
inline uint8_t getValueType() const {
return valueType_;
}
private:
inline bool hasValue() const {
return valueType_ <= TypesTupleSize::value;
}
template<typename _U>
void set( const _U& value, const bool clear);
template<typename _U>
void set( _U&& value, const bool clear);
template<typename >
friend struct TypeWriter;
template<typename ... _FriendTypes>
friend struct AssignmentVisitor;
template<typename _FriendType>
friend struct TypeEqualsVisitor;
template<typename ... _FriendTypes>
friend struct PartialEqualsVisitor;
template<typename ... _FriendTypes>
friend struct InputStreamReadVisitor;
template<class Variant, typename ... _FTypes>
friend struct ApplyVoidIndexVisitor;
uint8_t valueType_;
typename std::aligned_storage<maxSize>::type valueStorage_;
};
} // namespace CommonAPI
#include "SerializableVariant.hpp"
#endif // COMMONAPI_SERIALIZABLE_VARIANT_H_
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