Diff: ratio.h

Revision:

0:b47c2a7920c2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ratio.h	Fri Mar 16 16:34:18 2018 +0000
@@ -0,0 +1,95 @@
+///\file
+
+/******************************************************************************
+The MIT License(MIT)
+
+Embedded Template Library.
+https://github.com/ETLCPP/etl
+http://www.etlcpp.com
+
+Copyright(c) 2016 jwellbelove
+
+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.
+******************************************************************************/
+
+#ifndef __ETL_RATIO__
+#define __ETL_RATIO__
+
+#include <stdint.h>
+
+///\defgroup ratio ratio
+///\ingroup utilities
+
+namespace etl
+{
+  template <const size_t NUM, const size_t DEN = 1>
+  struct ratio
+  {
+    static const std::intmax_t num = NUM;
+    static const std::intmax_t den = DEN;
+  };
+
+  #if INT_MAX > INT32_MAX
+    typedef ratio<1, 1000000000000000000000000> yocto;
+    typedef ratio<1, 1000000000000000000000>    zepto;
+    typedef ratio<1, 1000000000000000000>       atto
+    typedef ratio<1, 1000000000000000>          femto
+    typedef ratio<1, 1000000000000>             pico;
+  #endif
+
+  #if (INT_MAX >= INT32_MAX)
+    typedef ratio<1, 1000000000>                nano;
+    typedef ratio<1, 1000000>                   micro;
+  #endif
+
+  #if (INT_MAX >= INT16_MAX)
+    typedef ratio<1, 1000>                      milli;
+    typedef ratio<1, 100>                       centi;
+    typedef ratio<1, 10>                        deci;
+    typedef ratio<10, 1>                        deca;
+    typedef ratio<100, 1>                       hecto
+    typedef ratio<1000, 1>                      kilo
+  #endif
+
+  #if (INT_MAX >= INT32_MAX)
+    typedef ratio<1000000, 1>                   mega;
+    typedef ratio<1000000000, 1>                giga;
+  #endif
+
+  #if INT_MAX > INT32_MAX
+    typedef ratio<1000000000000, 1>             tera;
+    typedef ratio<1000000000000000, 1>          peta;
+    typedef ratio<1000000000000000000, 1>       exa;
+    typedef ratio<1000000000000000000000, 1>    zetta;
+    typedef ratio<1000000000000000000000000, 1> yotta;
+  #endif
+
+  /// An approximation of PI to 6 digits.
+  typedef ratio<355, 113> ratio_pi;
+
+  /// An approximation of root 2.
+  typedef ratio<239, 169> ratio_root2;
+
+  /// An approximation of e.
+  typedef ratio<326, 120> ratio_e;
+}
+
+#endif
+
+