diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/newtype/impl/type_traits_extensions.hpp | 61 | ||||
| -rw-r--r-- | include/newtype/new_type.hpp | 27 |
2 files changed, 88 insertions, 0 deletions
diff --git a/include/newtype/impl/type_traits_extensions.hpp b/include/newtype/impl/type_traits_extensions.hpp index 5104306..6224d29 100644 --- a/include/newtype/impl/type_traits_extensions.hpp +++ b/include/newtype/impl/type_traits_extensions.hpp @@ -887,6 +887,67 @@ namespace nt::impl template<typename T> auto constexpr is_nothrow_subtract_assignable_v = is_nothrow_subtract_assignable<T>::value; + /** + * @brief A trait to test if a given type is multiply-assignable + * + * @tparam T The type to test + * @note This specialization forms the base case for non-multiply-assignable T + */ + template<typename T, typename = void> + struct is_multiply_assignable : std::false_type + { + }; + + /** + * @brief A trait to test if a given type is multiply-assignable + * + * @tparam T The type to test + * @note This specialization forms the case for multiply-assignable T + */ + template<typename T> + struct is_multiply_assignable<T, std::void_t<decltype(std::declval<T &>() *= std::declval<T const &>())>> : std::true_type + { + }; + + /** + * @brief A variable template to test if a given type is multiply-assignable + * + * @tparam T The type to test + */ + template<typename T> + auto constexpr is_multiply_assignable_v = is_multiply_assignable<T>::value; + + /** + * @brief A trait to test if a given type is noexcept multiply-assignable + * + * @tparam T The type to test + * @note This specialization forms the base case for non-noexcept multiply-assignable or non-multiply-assignable T + */ + template<typename T, typename = void> + struct is_nothrow_multiply_assignable : std::false_type + { + }; + + /** + * @brief A trait to test if a given type is noexcept multiply-assignable + * + * @tparam T The type to test + * @note This specialization forms the case for multiply-assignable T detemining if T is noexcept multiply-assignable + */ + template<typename T> + struct is_nothrow_multiply_assignable<T, std::void_t<decltype(std::declval<T &>() *= std::declval<T const &>())>> + : std::bool_constant<noexcept(std::declval<T &>() *= std::declval<T const &>())> + { + }; + + /** + * @brief A variable template to test if a given type is noexcept multiply-assignable + * + * @tparam T The type to test + */ + template<typename T> + auto constexpr is_nothrow_multiply_assignable_v = is_nothrow_multiply_assignable<T>::value; + } // namespace compound_arithmetic } // namespace nt::impl diff --git a/include/newtype/new_type.hpp b/include/newtype/new_type.hpp index 8d55f61..a7ab4af 100644 --- a/include/newtype/new_type.hpp +++ b/include/newtype/new_type.hpp @@ -50,6 +50,13 @@ namespace nt -> std::enable_if_t<DerivationClauseV(nt::Arithmetic) && impl::is_subtract_assignable_v<BaseTypeT>, new_type<BaseTypeT, TagTypeT, DerivationClauseV> &>; + template<typename BaseTypeT, typename TagTypeT, auto DerivationClauseV> + auto constexpr friend + operator*=(new_type<BaseTypeT, TagTypeT, DerivationClauseV> & lhs, + new_type<BaseTypeT, TagTypeT, DerivationClauseV> const & rhs) noexcept(impl::is_nothrow_multiply_assignable_v<BaseTypeT>) + -> std::enable_if_t<DerivationClauseV(nt::Arithmetic) && impl::is_multiply_assignable_v<BaseTypeT>, + new_type<BaseTypeT, TagTypeT, DerivationClauseV> &>; + using super = impl::new_type_move_assignment<BaseType, TagType>; public: @@ -436,6 +443,26 @@ namespace nt } /** + * @brief Multiply two instances of the same nt::new_type, modifying the left-hand side + * + * @note This operator is only available if the derivation clause of the passed in nt::new_type objects contains nt::Arithmetic and the base + * type is multiplyable. + * @param lhs The left-hand side of the multiplyition + * @param rhs The right-hand side of the multiplyition + * @return a reference to the the modified value + */ + template<typename BaseType, typename TagType, auto DerivationClause> + auto constexpr + operator*=(new_type<BaseType, TagType, DerivationClause> & lhs, + new_type<BaseType, TagType, DerivationClause> const & rhs) noexcept(impl::is_nothrow_multiply_assignable_v<BaseType>) + -> std::enable_if_t<DerivationClause(nt::Arithmetic) && impl::is_multiply_assignable_v<BaseType>, + new_type<BaseType, TagType, DerivationClause> &> + { + lhs.m_value *= rhs.m_value; + return lhs; + } + + /** * @brief Divide two instances of the same nt::new_type * * @note This operator is only available if the derivation clause of the passed in nt::new_type objects contains nt::Arithmetic and the base |