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Message.hpp
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/*******************************************************************************
*
* File: Message.hpp
*
* Contents: Declaration of Message base-class.
*
* Copyright 2017
*
* Author: David Juhasz (david.juhasz@tuwien.ac.at)
*
******************************************************************************/
#ifndef ROSA_CORE_MESSAGE_HPP
#define ROSA_CORE_MESSAGE_HPP
#include "rosa/support/log.h"
#include "rosa/support/type_token.hpp"
namespace rosa {
// Message interface. The interface provides means to check the type of the
// stored values, but actual data is to be managed by derived implementations.
// Messages are immutable data objects, obtaining their data upon creation and
// providing only constant references for the stored values.
// NOTE: Any reference obtained from a Message instance remains valid only as
// long as the owning Message object is not destroyed.
class Message {
protected:
// Ctor.
// NOTE: No implementation for empty list.
template <typename Type, typename... Ts> Message(Type, Ts...) noexcept;
// No copy and move.
Message(const Message &) = delete;
Message(Message &&) = delete;
Message &operator=(const Message &) = delete;
Message &operator=(Message &&) = delete;
public:
// A valid, non-empty token representing the types of the values stored in
// the Message.
const Token T;
// The number of types encoded in T, that is the number of values stored in
// Message.
const size_t Size;
// Virtual dtor.
virtual ~Message(void);
// Tells if the value in position Pos is of type Type.
// NOTE: Token encodes atoms as AtomValue and not directly AtomConstants.
// PRE: Pos < Size
template <typename Type> bool isTypeAt(const size_t Pos) const noexcept;
// Gives a constant reference of the value of type Type in position Pos.
// PRE: Pos < Size && isTypeAt(Pos)
template <typename Type>
const Type &getValueAt(const size_t Pos) const noexcept;
protected:
// Provides an untyped pointer for the value in position Pos.
// PRE: Pos < Size
virtual const void *getPointerTo(const size_t Pos) const noexcept = 0;
};
template <typename Type, typename... Ts>
Message::Message(Type, Ts...) noexcept : T(TypeToken<Type, Ts...>::Value),
Size(lengthOfToken(T)) {
ASSERT(validToken(T) &&
lengthOfToken(T) == (1 + sizeof...(Ts))); // Sanity check.
LOG_TRACE("Creating Message with Token(" + to_string(T) + ")");
}
template <typename Type>
bool Message::isTypeAt(const size_t Pos) const noexcept {
ASSERT(Pos < Size);
Token T_ = T; // NOLINT
dropNOfToken(T_, Pos);
return isHeadOfTokenTheSameType<Type>(T_);
}
template <typename Type>
const Type &Message::getValueAt(const size_t Pos) const noexcept {
ASSERT(Pos < Size && isTypeAt<Type>(Pos));
return *static_cast<const Type *>(getPointerTo(Pos));
}
} // End namespace rosa
#endif // ROSA_CORE_MESSAGE_HPP

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