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


.. _program_listing_file_ellcpp_utility.hpp:

Program Listing for File utility.hpp
====================================

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

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

.. code-block:: cpp

   // -*- coding: utf-8 -*-
   #pragma once
   
   #include <type_traits>
   #include <utility>
   #include <xtensor/xarray.hpp>
   
   using Arr = xt::xarray<double, xt::layout_type::row_major>;
   
   template <typename T>
   constexpr auto zeros(std::initializer_list<T>&& x) ->
       typename std::enable_if<std::is_integral<T>::value, Arr>::type
   {
       return Arr {xt::zeros<double>(x)};
   }
   
   template <typename T>
   constexpr auto zeros(const T& /* unused */) noexcept(noexcept(T {})) ->
       typename std::enable_if<std::is_floating_point<T>::value, T>::type
   {
       return T {};
   }
   
   template <typename T>
   constexpr auto zeros(const T& x) ->
       typename std::enable_if<!std::is_floating_point<T>::value, T>::type
   {
       return T {xt::zeros<double>({x.size()})};
   }