range_supp.hpp

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// Copyright (c) 2025--present, The Simons Foundation
// This file is part of TRIQS/modest and is licensed under the terms of GPLv3 or later.
// SPDX-License-Identifier: GPL-3.0-or-later
// See LICENSE in the root of this distribution for details.
 
#pragma once
#include <ranges>
 
namespace triqs {
 
  template <std::ranges::input_range R> bool all_equal(R const &r) {
    return std::ranges::adjacent_find(r, std::not_equal_to{}) == std::ranges::end(r);
  }
} // namespace triqs