const-range-adaptor.hh

/* vim: set et ft=cpp.doxygen sts=2 sw=2 ts=8 : */
/**
 * Copyright © 2013 Saleem Abdulrasool <[email protected]>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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 **/

#ifndef const_range_adaptor_hh
#define const_range_adaptor_hh

template <typename type_,
          typename const_iterator_type_ = typename type_::const_iterator,
          const_iterator_type_ (type_::*begin_expr_)() const = &type_::begin,
          const_iterator_type_ (type_::*end_expr_)() const = &type_::end>
class const_range_adaptor {
 public:
  constexpr const_range_adaptor(const type_ & iterable) noexcept
    : iterable_(iterable) {}
  const_iterator_type_ begin() const { return (iterable_.*begin_expr_)(); }
  const_iterator_type_ end() const { return (iterable_.*end_expr_)(); }
 private:
  const type_ & iterable_;
};

#endif