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feat: specifying an associated quantity for a derived unit support added

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Mateusz Pusz
2023-02-13 18:29:03 +01:00
parent 1492c5c19e
commit 0d33926a74
1 changed files with 17 additions and 0 deletions
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17
src/core/include/mp_units/unit.h
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@@ -27,6 +27,7 @@
#include <mp_units/bits/external/fixed_string.h>
#include <mp_units/bits/external/type_name.h>
#include <mp_units/bits/external/type_traits.h>
#include <mp_units/bits/get_associated_quantity.h>
#include <mp_units/bits/magnitude.h>
#include <mp_units/bits/quantity_spec_concepts.h>
#include <mp_units/bits/ratio.h>
@@ -145,6 +146,22 @@ struct named_unit<Symbol, U> : std::remove_const_t<decltype(U)> {
static constexpr auto symbol = Symbol; ///< Unique unit identifier
};
/**
* @brief Specialization for a unit with special name valid only for a specific quantity
*
* The same as the above but additionally limits the usage of this unit to provided quantities.
*
* @tparam Symbol a short text representation of the unit
* @tparam Unit a unit for which we provide a special name
* @tparam QuantitySpec a specification of a quantity to be measured with this unit
*/
template<basic_symbol_text Symbol, AssociatedUnit auto U, QuantityKindSpec auto QS>
requires(!Symbol.empty()) && (QS.dimension == detail::get_associated_quantity(U).dimension)
struct named_unit<Symbol, U, QS> : std::remove_const_t<decltype(U)> {
static constexpr auto symbol = Symbol; ///< Unique unit identifier
static constexpr auto quantity_spec = QS;
};
/**
* @brief A unit of a physical constant
*