added example and some more units to fps system

example/foot_pound_second.cpp

@@ -0,0 +1,104 @@
+// The MIT License (MIT)
+//
+// Copyright (c) 2018 Mateusz Pusz
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#include <units/format.h>
+#include <units/physical/fps/density.h>
+#include <units/physical/fps/length.h>
+#include <units/physical/fps/mass.h>
+#include <units/physical/fps/power.h>
+#include <units/physical/fps/speed.h>
+#include <units/physical/fps/volume.h>
+#include <units/physical/si/length.h>
+#include <units/physical/si/mass.h>
+#include <units/physical/si/power.h>
+#include <units/physical/si/speed.h>
+#include <units/physical/si/volume.h>
+
+#include <units/concepts.h>
+#include <units/quantity.h>
+
+#include <iostream>
+
+using namespace units::physical;
+
+
+// Some basic specs for the warship   
+struct Ship {
+  fps::length<fps::foot> length;
+  fps::length<fps::foot> draft;
+  fps::length<fps::foot> beam;
+
+  fps::speed<fps::foot_per_second> speed;
+  fps::mass<fps::pound> mass;
+
+  fps::length<fps::inch> mainGuns; 
+  fps::mass<fps::pound> shellMass;
+  fps::speed<fps::foot_per_second> shellSpeed;
+  fps::power<fps::foot_poundal_per_second> power;
+
+
+};
+
+// Print 'a' in its current units and print its value cast to the units in each of Args
+template<class ...Args, units::Quantity Q>
+auto fmt_line(const Q a) {
+  return fmt::format("{:22}",a) + (fmt::format(",{:20}", units::quantity_cast<Args>(a)) + ...);
+}
+
+// Print the ship details in the units as defined in the Ship struct, in other imperial units, and in SI
+std::ostream& print_details(std::string_view description, const Ship& ship) {
+  using namespace units::physical::fps::literals;
+  const auto waterDensity = 62.4q_lb_per_ft3;
+  std::cout << fmt::format("{}\n", description);
+  std::cout << fmt::format("{:20} : {}\n", "length",    fmt_line<fps::length<fps::yard>, si::length<si::metre>>(ship.length))
+            << fmt::format("{:20} : {}\n", "draft",     fmt_line<fps::length<fps::yard>, si::length<si::metre>>(ship.draft))
+            << fmt::format("{:20} : {}\n", "beam",      fmt_line<fps::length<fps::yard>, si::length<si::metre>>(ship.beam))
+            << fmt::format("{:20} : {}\n", "mass",      fmt_line<fps::mass<fps::long_ton>, si::mass<si::tonne>>(ship.mass))
+            << fmt::format("{:20} : {}\n", "speed",     fmt_line<fps::speed<fps::knot>, si::speed<si::kilometre_per_hour>>(ship.speed))
+            << fmt::format("{:20} : {}\n", "power",     fmt_line<fps::power<fps::horse_power>, si::power<si::kilowatt>>(ship.power))
+            << fmt::format("{:20} : {}\n", "main guns", fmt_line<fps::length<fps::inch>, si::length<si::millimetre>>(ship.mainGuns))
+            << fmt::format("{:20} : {}\n", "fire shells weighing",fmt_line<fps::mass<fps::long_ton>, si::mass<si::kilogram>>(ship.shellMass))
+            << fmt::format("{:20} : {}\n", "fire shells at",fmt_line<fps::speed<fps::mile_per_hour>, si::speed<si::kilometre_per_hour>>(ship.shellSpeed))
+            << fmt::format("{:20} : {}\n", "volume underwater", fmt_line<si::volume<si::cubic_metre>, si::volume<si::litre>>(ship.mass / waterDensity));
+  return std::cout;
+}
+
+int main()
+{
+  using namespace units::physical::si::literals;
+  using namespace units::physical::fps::literals;
+  
+
+  // KMS Bismark, using the units the Germans would use, taken from Wiki
+  auto bismark = Ship{.length{251.q_m}, .draft{9.3q_m}, .beam{36q_m}, .speed{56q_km_per_h}, .mass{50.3q_t}, .mainGuns{380q_mm}, .shellMass{800q_kg}, .shellSpeed{820.q_m_per_s}, .power{110.45q_kW}};
+
+  // USS Iowa, using units from the foot-pound-second system
+  auto iowa = Ship{.length{860.q_ft}, .draft{37.q_ft + 2.q_in}, .beam{108.q_ft + 2.q_in}, .speed{33q_knot}, .mass{57'540q_lton}, .mainGuns{16q_in}, .shellMass{2700q_lb}, .shellSpeed{2690.q_ft_per_s}, .power{212'000q_hp}};
+
+  // HMS King George V, using units from the foot-pound-second system
+  auto kgv = Ship{.length{745.1q_ft}, .draft{33.q_ft + 7.5q_in}, .beam{103.2q_ft + 2.5q_in}, .speed{28.3q_knot}, .mass{42'245q_lton}, .mainGuns{14q_in}, .shellMass{1'590q_lb}, .shellSpeed{2483.q_ft_per_s}, .power{110'000q_hp}};
+
+  print_details("KMS Bismark, defined in appropriate units from the SI system", bismark) << "\n\n";
+  print_details("USS Iowa, defined in appropriate units foot-pound-second system", iowa) << "\n\n";
+  print_details("HMS King George V, defined in appropriate units foot-pound-second system", kgv);
+
+}