BuilderOptions.h

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// BSD 3-Clause License; see https://github.com/scikit-hep/awkward-1.0/blob/main/LICENSE
 
#ifndef AWKWARD_BUILDEROPTIONS_H_
#define AWKWARD_BUILDEROPTIONS_H_
 
#include <cassert>
#include <cstring>
#include <tuple>
#include <type_traits>
#include <vector>
#include <stdint.h>
 
namespace awkward {
 
  template <typename... OPTIONS>
  struct Options {
    static constexpr std::size_t value = sizeof...(OPTIONS);
 
    using OptionsPack = typename std::tuple<OPTIONS...>;
 
    // FIXME:
    // std::tuple_element_t is missing on some of the CI node compilers
    //
    // template<std::size_t INDEX>
    // using OptionType = std::tuple_element_t<INDEX, OptionsPack>;
 
    template <std::size_t INDEX>
    using OptionType =
        typename std::tuple_element<INDEX, decltype(OptionsPack())>::type;
 
    Options(OPTIONS... options) : pars(options...) {}
 
    int64_t
    initial() const noexcept {
      return option<0>();
    }
 
    double
    resize() const noexcept {
      return option<1>();
    }
 
    template <std::size_t INDEX>
    const OptionType<INDEX>&
    option() const noexcept {
      return std::get<INDEX>(pars);
    }
 
    OptionsPack pars;
  };
 
  using BuilderOptions = Options<int64_t, double>;
}  // namespace awkward
 
#endif  // AWKWARD_BUILDEROPTIONS_H_