:github_url: https://github.com/svenevs/exhale-companion


.. _program_listing_file_ellcpp_half_nonnegative.hpp:

Program Listing for File half_nonnegative.hpp
=============================================

|exhale_lsh| :ref:`Return to documentation for file <file_ellcpp_half_nonnegative.hpp>` (``ellcpp/half_nonnegative.hpp``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   /*
    * Copyright 2019 Denis Yaroshevskiy
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *     http://www.apache.org/licenses/LICENSE-2.0
    *
    * Unless required by applicable law or agreed to in writing, software
    * distributed under the License is distributed on an "AS IS" BASIS,
    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    * See the License for the specific language governing permissions and
    * limitations under the License.
    */
   
   #ifndef ALGO_HALF_NONNEGATIVE_H
   #define ALGO_HALF_NONNEGATIVE_H
   
   #include <type_traits>
   #include <utility>
   
   namespace algo
   {
   
   template <typename N>
   auto half_nonnegative(N n) noexcept ->
       typename std::enable_if<std::is_integral<N>::value, N>::type
   {
       using UN = typename std::make_unsigned<N>::type;
       return static_cast<N>(static_cast<UN>(n) / 2);
   }
   
   template <typename N>
   auto half_nonnegative(N n) noexcept ->
       typename std::enable_if<!std::is_integral<N>::value, N>::type
   {
       return std::move(n) / 2;
   }
   
   } // namespace algo
   
   #endif // ALGO_HALF_NONNEGATIVE_H