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Don't fail environmental check if README.md exists (but .txt and no-suffix don't)

///////////////////////////////////////////////////////////////////////////////
//  Copyright 2012 John Maddock.
//  Copyright Christopher Kormanyos 2013. Distributed under the Boost
//  Software License, Version 1.0. (See accompanying file
//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//

#ifndef BOOST_MP_DETAIL_DYNAMIC_ARRAY_HPP
  #define BOOST_MP_DETAIL_DYNAMIC_ARRAY_HPP

  #include <vector>
  #include <boost/multiprecision/detail/rebind.hpp>

  namespace boost { namespace multiprecision { namespace backends { namespace detail
  {
    template <class value_type, const boost::uint32_t elem_number, class my_allocator>
    struct dynamic_array : public std::vector<value_type, typename rebind<value_type, my_allocator>::type>
    {
       dynamic_array() :
         std::vector<value_type, typename rebind<value_type, my_allocator>::type>(static_cast<typename std::vector<value_type, typename rebind<value_type, my_allocator>::type>::size_type>(elem_number), static_cast<value_type>(0))
       {
       }

             value_type* data()       { return &(*(this->begin())); }
       const value_type* data() const { return &(*(this->begin())); }
    };
  } } } } // namespace boost::multiprecision::backends::detail

#endif // BOOST_MP_DETAIL_DYNAMIC_ARRAY_HPP