hello_units example added

README.md

@@ -9,11 +9,12 @@
 
 ```cpp
 #include <units/physical/si/velocity.h>
+#include <units/format.h>
 #include <iostream>
 
 using namespace units;
 
-constexpr Velocity auto avg_speed(Length auto d, Time auto t)
+constexpr Velocity AUTO avg_speed(Length auto d, Time auto t)
 {
   return d / t;
 }
@@ -21,12 +22,15 @@ constexpr Velocity auto avg_speed(Length auto d, Time auto t)
 int main()
 {
   using namespace si::literals;
-  Velocity auto v1 = avg_speed(220km, 2h);
-  Velocity auto v2 = avg_speed(140mi, 2h);
+  Velocity AUTO v1 = avg_speed(220km, 2h);
+  Velocity AUTO v2 = avg_speed(si::length<si::mile>(140), si::time<si::hour>(2));
+  Velocity AUTO v3 = quantity_cast<si::metre_per_second>(v2);
+  Velocity AUTO v4 = quantity_cast<int>(v3);
 
   std::cout << v1 << '\n';                             // 110 km/h
-  std::cout << quantity_cast<si::metre_per_second>(speed) << '\n';  // 30.5556 m/s
-  std::cout << v2 << '\n';                                          // 70 mi/h
+  std::cout << fmt::format("{}", v2) << '\n';          // 70 mi/h
+  std::cout << fmt::format("{:%Q in %q}", v3) << '\n'; // 31.2928 in m/s
+  std::cout << fmt::format("{:%Q}", v4) << '\n';       // 31
 }
 ```
 

example/CMakeLists.txt

@@ -26,5 +26,6 @@ function(add_example target)
 endfunction()
 
 add_example(avg_velocity)
+add_example(hello_units)
 add_example(measurement)
 add_example(unknown_dimension)

example/hello_units.cpp

@@ -0,0 +1,46 @@
+// 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/physical/si/velocity.h>
+#include <units/format.h>
+#include <iostream>
+
+using namespace units;
+
+constexpr Velocity AUTO avg_speed(Length auto d, Time auto t)
+{
+  return d / t;
+}
+
+int main()
+{
+  using namespace si::literals;
+  Velocity AUTO v1 = avg_speed(220km, 2h);
+  Velocity AUTO v2 = avg_speed(si::length<si::mile>(140), si::time<si::hour>(2));
+  Velocity AUTO v3 = quantity_cast<si::metre_per_second>(v2);
+  Velocity AUTO v4 = quantity_cast<int>(v3);
+
+  std::cout << v1 << '\n';                             // 110 km/h
+  std::cout << fmt::format("{}", v2) << '\n';          // 70 mi/h
+  std::cout << fmt::format("{:%Q in %q}", v3) << '\n'; // 31.2928 in m/s
+  std::cout << fmt::format("{:%Q}", v4) << '\n';       // 31
+}