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feat: is_scalar, is_vector, and is_tensor customization points added

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Mateusz Pusz
2022-12-19 13:39:21 +01:00
parent c5fa2399af
commit f1f1009c3f
1 changed files with 41 additions and 3 deletions
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44
src/core/include/units/customization_points.h
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@@ -23,6 +23,7 @@
#pragma once
#include <units/bits/external/hacks.h>
#include <units/bits/external/type_traits.h>
#include <limits>
#include <type_traits>
@@ -40,9 +41,46 @@ namespace units {
template<typename Rep>
inline constexpr bool treat_as_floating_point = std::is_floating_point_v<Rep>;
template<typename T>
requires requires { typename T::value_type; }
inline constexpr bool treat_as_floating_point<T> = treat_as_floating_point<typename T::value_type>;
template<typename Rep>
requires requires { typename Rep::value_type; }
inline constexpr bool treat_as_floating_point<Rep> = treat_as_floating_point<typename Rep::value_type>;
/**
* @brief Specifies a type to have a scalar character
*
* A scalar is a physical quantity that has magnitude but no direction.
*/
template<typename Rep>
inline constexpr bool is_scalar = std::is_floating_point_v<Rep> || (std::is_integral_v<Rep> && !is_same_v<Rep, bool>);
/**
* @brief Specifies a type to have a vector character
*
* Vectors are physical quantities that possess both magnitude and direction
* and whose operations obey the axioms of a vector space.
*
* In specific cases a scalar can represent a vector with the default direction.
* If that is the intent, a user should provide a partial specialization:
*
* @code{.cpp}
* template<class T>
* requires units::is_scalar<T>
* inline constexpr bool units::is_vector<T> = true;
* @endcode
*/
template<typename Rep>
inline constexpr bool is_vector = false;
/**
* @brief Specifies a type to have a tensor character
*
* Tensors can be used to describe more general physical quantities.
*
* A vector is a tensor of the first order and a scalar is a tensor of order zero.
* Similarly to `is_vector` a partial specialization is needed in such cases.
*/
template<typename Rep>
inline constexpr bool is_tensor = false;
/**
* @brief A type trait that defines zero, one, min, and max for a representation type