refactor: References are now guarded UNITS_REFERENCES with (ON by default) + examples duplicated to subdirectories

Now References can be disabled to meassure a compile time impact. Also the same examples are now provided in two subdirectories to be able to easily compare the pros and cons of every quantity construction technique.
2021-04-06 15:57:28 +02:00
parent b842c3f94a
commit b982921d27
118 changed files with 2841 additions and 71 deletions
@@ -1,61 +0,0 @@
-/*
- 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/format.h>
-#include <units/isq/si/length.h>
-#include <iostream>
-#include <type_traits>
-
-/*
-  get conversion factor from one dimensionally equivalent
-  quantity type to another
-*/
-
-namespace {
-
-template<units::Quantity Target, units::Quantity Source>
-  requires units::equivalent<typename Source::dimension, typename Target::dimension>
-inline constexpr std::common_type_t<typename Target::rep, typename Source::rep> conversion_factor(Target, Source)
-{
-  // get quantities looking like inputs but with Q::rep that doesn't 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}}.number();
-}
-
-}  // namespace
-
-int main()
-{
-  using namespace units::isq::si;
-  using namespace units::isq::si::references;
-
-  std::cout << "conversion factor in mp-units...\n\n";
-
-  constexpr length<metre> lengthA = 2.0 * m;
-  constexpr length<millimetre> lengthB = lengthA;
-
-  std::cout << fmt::format("lengthA( {} ) and lengthB( {} )\n", lengthA, lengthB)
-            << "represent the same length in different units.\n\n";
-
-  std::cout << fmt::format("therefore ratio lengthA / lengthB == {}\n\n", lengthA / lengthB);
-
-  std::cout << fmt::format("conversion factor from lengthA::unit of {:%q} to lengthB::unit of {:%q}:\n\n", lengthA, lengthB)
-            << fmt::format("lengthB.number( {} ) == lengthA.number( {} ) * conversion_factor( {} )\n",
-                           lengthB.number(), lengthA.number(), conversion_factor(lengthB, lengthA));
-}