mirror of
https://github.com/mpusz/mp-units.git
synced 2026-01-30 02:02:22 +01:00
868842bd46
Add si::density quantity header . Add si::resistance quantity header. Update si::capacitance header with mF, uF, nF, pF. Update si::voltage header with mV, uV, nV,pV Third party example : add capacitor time curve example Add incoherent length units, TODO move them out from si header. Third party examples : add clcpp_response showing effectivenes of typed units for physical quantity library Third party examples : add conversion factor example Add third party examples to cmake Third party examples : box example : Add air_density constant for clarity remove explicit this-> and tidy up. Third party examples : in clcpp response example, change base unit from km to m for single type or all units example. Third party examples : conversion_factor , add inline constexpr to units_str function. Third party examples : box_example, change quantity::unit syntax to quantity::unit<> to allow generic(default double) value_type. examples : remove examples from third party to main examples directory. Update cmake. physical/si/resistance.hpp : remove underscores from kiloohm etc, UDL collision with 'R' so prefix with underscore
92 lines
2.8 KiB
C++
92 lines
2.8 KiB
C++
|
|
/*
|
|
Copyright (c) 2003-2020 Andy Little.
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see http://www.gnu.org/licenses./
|
|
*/
|
|
|
|
#include <units/physical/si/length.h>
|
|
|
|
/*
|
|
get conversion factor from one dimensionally equivalent
|
|
quantity type to another
|
|
*/
|
|
|
|
namespace {
|
|
|
|
template <
|
|
units::Quantity Target,
|
|
units::Quantity Source
|
|
>
|
|
requires units::equivalent_dim<typename Source::dimension,typename Target::dimension>
|
|
constexpr inline
|
|
std::common_type_t<
|
|
typename Target::rep,
|
|
typename Source::rep
|
|
>
|
|
conversion_factor(Target , Source)
|
|
{
|
|
// get quantities looking like inputs but with Q::rep that doesnt have narrowing conversion
|
|
typedef std::common_type_t<
|
|
typename Target::rep,
|
|
typename Source::rep
|
|
> rep;
|
|
typedef units::quantity<typename Source::dimension,typename Source::unit,rep> source;
|
|
typedef units::quantity<typename Target::dimension,typename Target::unit,rep> target;
|
|
return target{source{1}}.count();
|
|
}
|
|
|
|
// get at the units text of the quantity, without its numeric value
|
|
auto inline constexpr units_str( units::Quantity const & q)
|
|
{
|
|
typedef std::remove_cvref_t<decltype(q)> qtype;
|
|
return units::detail::unit_text<typename qtype::dimension, typename qtype::unit>();
|
|
}
|
|
}
|
|
|
|
namespace {
|
|
|
|
namespace length{
|
|
|
|
template <typename Rep = double>
|
|
using m = units::si::length<units::si::metre,Rep>;
|
|
|
|
template <typename Rep = double>
|
|
using mm = units::si::length<units::si::millimetre,Rep>;
|
|
}
|
|
}
|
|
|
|
#include <iostream>
|
|
|
|
using namespace units::si::literals;
|
|
int main()
|
|
{
|
|
std::cout << "conversion factor in mpusz/units...\n\n";
|
|
|
|
length::m<> constexpr lengthA = 2.0m;
|
|
length::mm<> constexpr lengthB = lengthA;
|
|
|
|
std::cout << "lengthA( " << lengthA << " ) and lengthB( " << lengthB << " )\n"
|
|
"represent the same length in different units.\n\n";
|
|
|
|
std::cout << "therefore ratio lengthA / lengthB == " << lengthA / lengthB << "\n\n";
|
|
|
|
std::cout << "conversion factor from "
|
|
"lengthA::unit of " << units_str(lengthA)
|
|
<< " to lengthB::unit of " << units_str(lengthB) << " :\n\n"
|
|
"lengthB.count( " << lengthB.count() << " ) == "
|
|
"lengthA.count( " << lengthA.count() << " ) * "
|
|
"conversion_factor( " << conversion_factor(lengthB, lengthA) << " )\n";
|
|
}
|