Diff: sqrt.h

Revision:

0:b47c2a7920c2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sqrt.h	Fri Mar 16 16:34:18 2018 +0000
@@ -0,0 +1,61 @@
+///\file
+
+/******************************************************************************
+The MIT License(MIT)
+
+Embedded Template Library.
+https://github.com/ETLCPP/etl
+https://www.etlcpp.com
+
+Copyright(c) 2017 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_SQRT__
+#define __ETL_SQRT__
+
+#include <stddef.h>
+
+#include "platform.h"
+#include "type_traits.h"
+#include "constant.h"
+
+namespace etl 
+{
+  //***************************************************************************
+  /// Calculates the smallest value that, when squared, will be not greater than VALUE.
+  //***************************************************************************
+  template <const size_t VALUE, const size_t I = 1>
+  struct sqrt
+  {
+    typedef typename etl::conditional<((I * I) > VALUE), 
+                                      etl::constant<intmax_t, I - 1>,
+                                      etl::sqrt<VALUE, I + 1> >::type type;
+
+    enum value_type
+    {
+      // Recursive definition.
+      value = type::value
+    };
+  };
+}
+
+#endif
+