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squashed_int.hpp
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/**************************************************************************//**
*
* \file rosa/support/squashed_int.hpp
*
* \author David Juhasz (david.juhasz@tuwien.ac.at)
*
* \date 2017
*
* \brief Facilities for squashing integer types into standard equivalents.
*
* \note This implementation is partially based on the `squashed_int`
* implementation of CAF.
* \todo Check license.
*
******************************************************************************/
#ifndef ROSA_SUPPORT_SQUASHED_INT_HPP
#define ROSA_SUPPORT_SQUASHED_INT_HPP
#include "rosa/support/type_list.hpp"
#include "rosa/support/type_pair.hpp"
namespace rosa {
/// Compile-time list of integer types.
///
/// \note This list is used to select a proper type as `rosa::type_nr_t`, always
/// make sure that `rosa::type_nr_t` remains correct whenever changing the list.
using IntegerTypesBySize = TypeList< // bytes
none_t, // 0
TypePair<int8_t, uint8_t>, // 1
TypePair<int16_t, uint16_t>, // 2
none_t, // 3
TypePair<int32_t, uint32_t>, // 4
none_t, // 5
none_t, // 6
none_t, // 7
TypePair<int64_t, uint64_t> // 8
>;
/// Squashes integer types into `[u]int_[8|16|32|64]_t` equivalents.
///
/// The squashed type for a type `T` can be obtained as \code
/// typename SquashedInt<T>::Type
/// \endcode
///
/// \tparam T the integer type to squash
///
/// \pre `T` is an integral type:\code
/// std::is_integral<T>::value
/// \endcode
template <typename T> struct SquashedInt {
STATIC_ASSERT((std::is_integral<T>::value), "squashing a non-integral type");
using TPair = typename TypeListAt<IntegerTypesBySize, sizeof(T)>::Type;
using Type =
typename std::conditional<std::is_signed<T>::value, typename TPair::First,
typename TPair::Second>::type;
};
/// Convenience alias for obtaining a squashed integer type.
template <typename T>
using squashed_int_t = typename SquashedInt<T>::Type;
/// \defgroup SquashedType
/// \brief Squashes a type.
///
/// The squashed type for a type `T` can be obtained as \code
/// typename SquashedType<T>::Type
/// \endcode
/// The used type `Type` is squashed with `SquashedInt` if `T` is integral,
/// and remains `T` otherwise.
///@{
/// Definition for the general case, used when `T` is not integral.
///
/// \tparam T the type to squash
/// \tparam IsIntegral Always use the default value!
template <typename T, bool IsIntegral = std::is_integral<T>::value>
struct SquashedType {
using Type = T;
};
/// Specialization for the case when `T` is integral.
///
/// \tparam T the type to squash
template <typename T>
struct SquashedType<T, true> {
using Type = squashed_int_t<T>;
};
///@}
/// Convenience alias for obtaining a squashed type.
template <typename T>
using squashed_t = typename SquashedType<T>::Type;
/// \defgroup SquashedTypeList
/// \brief Squashes a `rosa::TypeList` elementwise.
///
/// Replaces all types in a `rosa::TypeList` with their corresponding squashed
/// types by using `rosa::SquashedType`. The squashed `rosa::TypeList`
/// corresponding to `List` can be obtained as \code
/// typename SquashedTypeList<List>::Type
/// \endcode
///@{
/// Declaration of the template.
///
/// \tparam List `TypeList` to squash
template <typename List> struct SquashedTypeList;
// Specialization for the case of `rosa::EmptyTypeList`.
template <> struct SquashedTypeList<EmptyTypeList> {
using Type = EmptyTypeList;
};
/// Specialization for non-empty `rosa::TypeList`.
template <typename T, typename... Ts>
struct SquashedTypeList<TypeList<T, Ts...>> {
using Type = typename TypeListPush<
squashed_t<T>, typename SquashedTypeList<TypeList<Ts...>>::Type>::Type;
};
///@}
} // End namespace rosa
#endif // ROSA_SUPPORT_SQUASHED_INT_HPP

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