strong_type.hpp

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// -----------------------------------------------------------------------------------------------------
// Copyright (c) 2006-2021, Knut Reinert & Freie Universität Berlin
// Copyright (c) 2016-2021, Knut Reinert & MPI für molekulare Genetik
// This file may be used, modified and/or redistributed under the terms of the 3-clause BSD-License
// shipped with this file and also available at: https://github.com/seqan/seqan3/blob/master/LICENSE.md
// -----------------------------------------------------------------------------------------------------
 
#pragma once
 
#include <seqan3/std/concepts>
#include <type_traits>
 
#include <seqan3/core/add_enum_bitwise_operators.hpp>
#include <seqan3/core/debug_stream/debug_stream_type.hpp>
#include <seqan3/utility/type_traits/basic.hpp>
 
namespace seqan3::detail
{
//------------------------------------------------------------------------------
// enum strong_type_skill
//------------------------------------------------------------------------------
 
enum struct strong_type_skill
{
    none           = 0,
    add            = 1 << 0,
    subtract       = 1 << 1,
    multiply       = 1 << 2,
    divide         = 1 << 3,
    modulo         = 1 << 4,
    bitwise_and    = 1 << 5,
    bitwise_or     = 1 << 6,
    bitwise_xor    = 1 << 7,
    bitwise_not    = 1 << 8,
    bitwise_lshift = 1 << 9,
    bitwise_rshift = 1 << 10,
    logical_and    = 1 << 11,
    logical_or     = 1 << 12,
    logical_not    = 1 << 13,
    increment      = 1 << 14,
    decrement      = 1 << 15,
    convert        = 1 << 16,
    comparable     = 1 << 17,
    additive       = add | subtract,
    multiplicative = multiply | divide | modulo,
    bitwise_logic  = bitwise_and | bitwise_or | bitwise_xor | bitwise_not,
    bitwise_shift  = bitwise_lshift | bitwise_rshift,
    logic          = logical_and | logical_or | logical_not
};
}  //namespace seqan3::detail
 
namespace seqan3
{
template <>
constexpr bool add_enum_bitwise_operators<seqan3::detail::strong_type_skill> = true;
}
 
namespace seqan3::detail
{
// forward declared for the concept
template <typename, typename, strong_type_skill>
class strong_type;
 
//------------------------------------------------------------------------------
// concept derived_from_strong_type
//------------------------------------------------------------------------------
 
template <typename strong_type_t>
SEQAN3_CONCEPT derived_from_strong_type = requires (strong_type_t && obj)
{
    typename std::remove_reference_t<strong_type_t>::value_type;
 
    { std::remove_reference_t<strong_type_t>::skills };
 
    requires std::same_as<decltype(std::remove_reference_t<strong_type_t>::skills), strong_type_skill const>;
 
    requires std::derived_from<std::remove_cvref_t<strong_type_t>,
                               strong_type<typename std::remove_reference_t<strong_type_t>::value_type,
                                           std::remove_cvref_t<strong_type_t>,
                                           std::remove_reference_t<strong_type_t>::skills>>;
};
 
//------------------------------------------------------------------------------
// class strong_type
//------------------------------------------------------------------------------
 
template <typename value_t, typename derived_t, strong_type_skill skills_ = strong_type_skill::none>
class strong_type
{
public:
    static constexpr strong_type_skill skills = skills_;
    using value_type = value_t;
 
    constexpr strong_type()                                 noexcept = default; 
    constexpr strong_type(strong_type const &)              noexcept = default; 
    constexpr strong_type(strong_type &&)                   noexcept = default; 
    constexpr strong_type & operator= (strong_type const &) noexcept = default; 
    constexpr strong_type & operator= (strong_type &&)      noexcept = default; 
    ~strong_type()                                          noexcept = default; 
 
    constexpr explicit strong_type(value_t _value) : value(std::move(_value))
    {}
 
    constexpr value_t & get() & noexcept
    {
        return value;
    }
 
    constexpr value_t const & get() const & noexcept
    {
        return value;
    }
 
    constexpr value_t && get() && noexcept
    {
        return std::move(value);
    }
 
    constexpr value_t const && get() const && noexcept
    {
        return std::move(value);
    }
 
    constexpr derived_t operator+(strong_type const & other)
        requires ((skills & strong_type_skill::add) != strong_type_skill::none)
    {
        return derived_t{get() + other.get()};
    }
 
    constexpr derived_t operator-(strong_type const & other)
        requires ((skills & strong_type_skill::subtract) != strong_type_skill::none)
    {
        return derived_t{get() - other.get()};
    }
 
    constexpr derived_t operator*(strong_type const & other)
        requires ((skills & strong_type_skill::multiply) != strong_type_skill::none)
    {
        return derived_t{get() * other.get()};
    }
 
    constexpr derived_t operator/(strong_type const & other)
        requires ((skills & strong_type_skill::divide) != strong_type_skill::none)
    {
        return derived_t{get() / other.get()};
    }
 
    constexpr derived_t operator%(strong_type const & other)
        requires ((skills & strong_type_skill::modulo) != strong_type_skill::none)
    {
        return derived_t{get() % other.get()};
    }
 
    constexpr derived_t operator&(strong_type const & other)
        requires ((skills & strong_type_skill::bitwise_and) != strong_type_skill::none)
    {
        return derived_t{get() & other.get()};
    }
 
    constexpr derived_t operator|(strong_type const & other)
        requires ((skills & strong_type_skill::bitwise_or) != strong_type_skill::none)
    {
        return derived_t{get() | other.get()};
    }
 
    constexpr derived_t operator^(strong_type const & other)
        requires ((skills & strong_type_skill::bitwise_xor) != strong_type_skill::none)
    {
        return derived_t{get() ^ other.get()};
    }
 
    constexpr derived_t operator~()
        requires ((skills & strong_type_skill::bitwise_not) != strong_type_skill::none)
    {
        return derived_t{~get()};
    }
 
    constexpr derived_t operator<<(strong_type const & other)
        requires ((skills & strong_type_skill::bitwise_lshift) != strong_type_skill::none)
    {
        return derived_t{get() << other.get()};
    }
 
    template <std::integral integral_t>
    constexpr derived_t operator<<(integral_t const shift)
        requires ((skills & strong_type_skill::bitwise_lshift) != strong_type_skill::none)
    {
        return derived_t{get() << shift};
    }
 
    constexpr derived_t operator>>(strong_type const & other)
        requires ((skills & strong_type_skill::bitwise_rshift) != strong_type_skill::none)
    {
        return derived_t{get() >> other.get()};
    }
 
    template <std::integral integral_t>
    constexpr derived_t operator>>(integral_t const shift)
        requires ((skills & strong_type_skill::bitwise_rshift) != strong_type_skill::none)
    {
        return derived_t{get() >> shift};
    }
 
    constexpr bool operator&&(strong_type const & other)
        requires ((skills & strong_type_skill::logical_and) != strong_type_skill::none)
    {
        return get() && other.get();
    }
 
    constexpr bool operator||(strong_type const & other)
        requires ((skills & strong_type_skill::logical_or) != strong_type_skill::none)
    {
        return get() || other.get();
    }
 
    constexpr bool operator!()
        requires ((skills & strong_type_skill::logical_not) != strong_type_skill::none)
    {
        return !get();
    }
 
    constexpr derived_t & operator++()
        requires ((skills & strong_type_skill::increment) != strong_type_skill::none)
    {
        ++get();
        return static_cast<derived_t &>(*this);
    }
 
    constexpr derived_t operator++(int)
        requires ((skills & strong_type_skill::increment) != strong_type_skill::none)
    {
        derived_t tmp{get()};
        ++get();
        return tmp;
    }
 
    constexpr derived_t & operator--()
        requires ((skills & strong_type_skill::decrement) != strong_type_skill::none)
    {
        --get();
        return static_cast<derived_t &>(*this);
    }
 
    constexpr derived_t operator--(int)
        requires ((skills & strong_type_skill::decrement) != strong_type_skill::none)
    {
        derived_t tmp{get()};
        --get();
        return tmp;
    }
 
    constexpr bool operator==(strong_type const & rhs) const
        requires ((skills & strong_type_skill::comparable) != strong_type_skill::none)
    {
        return get() == rhs.get();
    }
 
    constexpr bool operator!=(strong_type const & rhs) const
        requires ((skills & strong_type_skill::comparable) != strong_type_skill::none)
    {
        return !(*this == rhs);
    }
 
    explicit constexpr operator value_t() const
        requires ((skills & strong_type_skill::convert) != strong_type_skill::none)
    {
        return get();
    }
 
private:
    value_t value;
};
 
//------------------------------------------------------------------------------
// related functions
//------------------------------------------------------------------------------
 
template <typename char_t, derived_from_strong_type strong_type_t>
debug_stream_type<char_t> & operator<<(debug_stream_type<char_t> & stream, strong_type_t && value)
{
    stream << value.get();
    return stream;
}
 
} // namespace seqan3::detail