to.hh

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#pragma once

#include <vcsn/misc/raise.hh>

namespace vcsn
{

  class to
  {
  public:
    to(int min_, int max_)
      : min{min_}
      , max{max_}
    {
      if (max == -2)
        max = min_;
      if (min == -1)
        min = 0;
      require(0 <= min
              && -1 <= max
              && (max == -1 || min <= max),
              "invalid exponents: ", min, ", ", max);
    }

    to(int min_)
      : to{min_, -2}
    {}

    to(unsigned min_)
      : to{int(min_)}
    {}

    bool finite() const
    {
      return max != -1;
    }

    bool single() const
    {
      return min == max;
    }

    int min;
    int max;
  };

  inline std::ostream& operator<<(std::ostream& o, const to& t)
  {
    return o << '{' << t.min << ", " << t.max << '}';
  }
}