range.hpp

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// Copyright (c) 2018--present, The Simons Foundation
// This file is part of TRIQS/nda and is licensed under the Apache License, Version 2.0.
// SPDX-License-Identifier: Apache-2.0
// See LICENSE in the root of this distribution for details.

 
#pragma once
 
#include "../traits.hpp"
 
#include <itertools/itertools.hpp>
 
#include <ostream>
#include <type_traits>
 
namespace nda {


  using itertools::range;

  struct ellipsis : range::all_t {};

  inline std::ostream &operator<<(std::ostream &os, range::all_t) noexcept { return os << "_"; }

  inline std::ostream &operator<<(std::ostream &os, ellipsis) noexcept { return os << "___"; }

  template <typename... Args>
  constexpr bool ellipsis_is_present = is_any_of<ellipsis, std::remove_cvref_t<Args>...>;

  template <typename T>
  constexpr bool is_range_or_ellipsis = is_any_of<std::remove_cvref_t<T>, range, range::all_t, ellipsis>;

 
} // namespace nda