215 lines
9.3 KiB
C++
215 lines
9.3 KiB
C++
/** @file basis_unit2.hpp **/
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#pragma once
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#include "native_unit.hpp"
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#include "basis_unit_abbrev.hpp"
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#include "xo/ratio/ratio.hpp"
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namespace xo {
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namespace qty {
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/** @class basis_unit2
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* @brief A dimensionless multiple of a single natively-specified basis dimension
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*
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* For example "3600 minutes" or "1e-6 grams"
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**/
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struct basis_unit {
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public:
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constexpr basis_unit() = default;
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constexpr basis_unit(dim native_dim, const scalefactor_ratio_type & scalefactor)
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: native_dim_{native_dim},
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scalefactor_{scalefactor}
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{}
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constexpr dim native_dim() const { return native_dim_; }
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constexpr const scalefactor_ratio_type & scalefactor() const { return scalefactor_; }
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constexpr basis_unit2_abbrev_type abbrev() const {
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return abbrev::basis_unit2_abbrev(native_dim_,
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scalefactor_);
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}
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constexpr basis_unit & operator=(const basis_unit & x) = default;
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/** @brief identifies a native unit, e.g. time (in seconds) **/
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dim native_dim_ = dim::invalid;
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/** @brief this unit defined as multiple scalefactor times native unit **/
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scalefactor_ratio_type scalefactor_;
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};
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namespace bu2 {
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constexpr basis_unit nanogram = basis_unit(dim::mass, scalefactor_ratio_type(1, 1000000000));
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constexpr basis_unit microgram = basis_unit(dim::mass, scalefactor_ratio_type(1, 1000000));
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constexpr basis_unit milligram = basis_unit(dim::mass, scalefactor_ratio_type(1, 1000));
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constexpr basis_unit gram = basis_unit(dim::mass, scalefactor_ratio_type(1, 1));
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constexpr basis_unit kilogram = basis_unit(dim::mass, scalefactor_ratio_type(1000, 1));
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}
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namespace units {
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/** for runtime work, would like to be able to promptly find special abbreviation
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* keyed by (native_dim, scalefactor).
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*
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* Also want to support compile-time-only unit computation.
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* Since constexpr unordered containers aren't obviously feasible (as of c++23).
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*
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* Solution adopted here is to support introduction of scaled native units
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* only at compile time, at least for now
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**/
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// ----- scaled_native_unit_abbrev_helper -----
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/* Require: InnerScale is ratio type; InnerScale >= 1
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*
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* NOTE: clang 18 doesn't accept that scalefactor_ratio_type is a 'structural type'
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*/
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template <dim BasisDim, std::int64_t InnerScaleNum = 1, std::int64_t InnerScaleDen = 1>
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struct scaled_native_unit2_abbrev;
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template <dim BasisDim>
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struct scaled_native_unit2_abbrev<BasisDim, 1, 1> {
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static constexpr const basis_unit2_abbrev_type value
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= (basis_unit2_abbrev_type::from_flatstring
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(native_unit2_v[static_cast<uint32_t>(BasisDim)]
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.abbrev_str()));
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};
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inline
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constexpr basis_unit2_abbrev_type
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bu_fallback_abbrev(dim basis_dim,
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const scalefactor_ratio_type & scalefactor)
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{
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return (basis_unit2_abbrev_type::from_flatstring
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(flatstring_concat
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(scalefactor.to_str<basis_unit2_abbrev_type::fixed_capacity>(),
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native_unit2_v[static_cast<std::uint32_t>(basis_dim)].abbrev_str())));
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}
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template <dim BasisDim,
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std::int64_t InnerScaleNum,
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std::int64_t InnerScaleDen>
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struct scaled_native_unit2_abbrev {
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/* e.g. unit of '1000 grams' will have abbrev '1000g' in absence
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* of a specialization for scaled_native_unit_abbrev
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*/
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static constexpr const basis_unit2_abbrev_type value
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= (basis_unit2_abbrev_type::from_flatstring
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(flatstring_concat
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(xo::ratio::ratio<std::int64_t>(InnerScaleNum,
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InnerScaleDen)
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.to_str<basis_unit2_abbrev_type::fixed_capacity>(),
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native_unit2_v[static_cast<std::uint32_t>(BasisDim)].abbrev_str())));
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// = bu_fallback_abbrev(BasisDim,
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// xo::ratio::ratio<std::int64_t>(InnerScaleNum, InnerScaleDen));
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};
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template <>
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struct scaled_native_unit2_abbrev<dim::mass, bu2::nanogram.scalefactor().num(), bu2::nanogram.scalefactor().den()> {
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static constexpr const basis_unit2_abbrev_type value = basis_unit2_abbrev_type::from_chars("ng");
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};
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template <>
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struct scaled_native_unit2_abbrev<dim::mass, 1, 1000000> {
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static constexpr const basis_unit2_abbrev_type value = basis_unit2_abbrev_type::from_chars("ug");
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};
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template <>
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struct scaled_native_unit2_abbrev<dim::mass, 1, 1000> {
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static constexpr const basis_unit2_abbrev_type value = basis_unit2_abbrev_type::from_chars("mg");
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};
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template <>
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struct scaled_native_unit2_abbrev<dim::mass, 1000, 1> {
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static constexpr const basis_unit2_abbrev_type value = basis_unit2_abbrev_type::from_chars("kg");
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};
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template <>
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struct scaled_native_unit2_abbrev<dim::mass, 1000000, 1> {
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static constexpr const basis_unit2_abbrev_type value = basis_unit2_abbrev_type::from_chars("t");
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};
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template <>
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struct scaled_native_unit2_abbrev<dim::mass, 1000000000, 1> {
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static constexpr const basis_unit2_abbrev_type value = basis_unit2_abbrev_type::from_chars("kt");
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};
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// ----- units for dim::distance -----
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template <>
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struct scaled_native_unit2_abbrev<dim::distance, 1, 1000000000> {
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static constexpr const basis_unit2_abbrev_type value = basis_unit2_abbrev_type::from_chars("nm");
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};
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template <>
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struct scaled_native_unit2_abbrev<dim::distance, 1, 1000000> {
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static constexpr const basis_unit2_abbrev_type value = basis_unit2_abbrev_type::from_chars("um");
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};
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template <>
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struct scaled_native_unit2_abbrev<dim::distance, 1, 1000> {
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static constexpr const basis_unit2_abbrev_type value = basis_unit2_abbrev_type::from_chars("mm");
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};
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template <>
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struct scaled_native_unit2_abbrev<dim::distance, 1000, 1> {
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static constexpr const basis_unit2_abbrev_type value = basis_unit2_abbrev_type::from_chars("km");
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};
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// ----- units for dim::time -----
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template <>
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struct scaled_native_unit2_abbrev<dim::time, 1, 1000000000> {
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static constexpr const basis_unit2_abbrev_type value = basis_unit2_abbrev_type::from_chars("ns");
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};
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template <>
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struct scaled_native_unit2_abbrev<dim::time, 1, 1000000> {
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static constexpr const basis_unit2_abbrev_type value = basis_unit2_abbrev_type::from_chars("us");
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};
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template <>
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struct scaled_native_unit2_abbrev<dim::time, 1, 1000> {
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static constexpr const basis_unit2_abbrev_type value = basis_unit2_abbrev_type::from_chars("ms");
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};
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template <>
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struct scaled_native_unit2_abbrev<dim::time, 60, 1> {
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static constexpr const basis_unit2_abbrev_type value = basis_unit2_abbrev_type::from_chars("min");
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};
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template <>
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struct scaled_native_unit2_abbrev<dim::time, 3600, 1> {
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static constexpr const basis_unit2_abbrev_type value = basis_unit2_abbrev_type::from_chars("hr");
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};
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template <>
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struct scaled_native_unit2_abbrev<dim::time, 24*3600, 1> {
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static constexpr const basis_unit2_abbrev_type value = basis_unit2_abbrev_type::from_chars("dy");
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};
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template <>
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struct scaled_native_unit2_abbrev<dim::time, 250*24*3600, 1> {
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static constexpr const basis_unit2_abbrev_type value = basis_unit2_abbrev_type::from_chars("yr250");
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};
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template <>
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struct scaled_native_unit2_abbrev<dim::time, 360*24*3600, 1> {
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static constexpr const basis_unit2_abbrev_type value = basis_unit2_abbrev_type::from_chars("yr360");
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};
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template <>
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struct scaled_native_unit2_abbrev<dim::time, 365*24*3600, 1> {
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static constexpr const basis_unit2_abbrev_type value = basis_unit2_abbrev_type::from_chars("yr365");
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};
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// ----- native unit abbrev api -----
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template <dim BasisDim, std::int64_t InnerScaleNum = 1, std::int64_t InnerScaleDen = 1>
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constexpr auto scaled_native_unit2_abbrev_v = scaled_native_unit2_abbrev<BasisDim, InnerScaleNum, InnerScaleDen>::value;
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}
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} /*namespace qty*/
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} /*namespace xo*/
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/** end basis_unit2.hpp **/
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