placeholders.hpp

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#pragma once
#include "placeholder.hpp"

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

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