args.hpp

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#pragma once
#include "arg.hpp"

namespace xtd {
  namespace expressions {
    template <size_t count>
    struct args {
      template <size_t index>
      constexpr auto get() const noexcept {
        return argument<index + 1> {};
      }
    };

    
    inline constexpr auto _ = xtd::expressions::expression::arg<1>;
    
    inline constexpr auto _1 = xtd::expressions::expression::arg<1>;
    inline constexpr auto _2 = xtd::expressions::expression::arg<2>;
    inline constexpr auto _3 = xtd::expressions::expression::arg<3>;
    inline constexpr auto _4 = xtd::expressions::expression::arg<4>;
    inline constexpr auto _5 = xtd::expressions::expression::arg<5>;
    inline constexpr auto _6 = xtd::expressions::expression::arg<6>;
    inline constexpr auto _7 = xtd::expressions::expression::arg<7>;
    inline constexpr auto _8 = xtd::expressions::expression::arg<8>;
    inline constexpr auto _9 = xtd::expressions::expression::arg<9>;
    inline constexpr auto _10 = xtd::expressions::expression::arg<10>;
  }
}

namespace std {
  template <size_t count>
  struct tuple_size<xtd::expressions::args<count>> : std::integral_constant<size_t, count> {};
  
  template <size_t index, size_t count>
  struct tuple_element<index, xtd::expressions::args<count>> {
    using type = argument<index + 1>;
  };
}
 
namespace xtd::expressions {
  template <size_t index, size_t count>
  constexpr auto get(xtd::expressions::args<count> const& p) noexcept {
    return p.template get<index>();
  }
}