//          Copyright Joakim Karlsson & Kim Gräsman 2010-2012.
// 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 IGLOO_EXACTLYOPERATOR_H
#define IGLOO_EXACTLYOPERATOR_H

namespace snowhouse {

   struct ExactlyOperator : public CollectionOperator
   {
      ExactlyOperator(unsigned int expected) : m_expected(expected) {}

      template <typename ConstraintListType, typename ActualType>
      void Evaluate(ConstraintListType& list, ResultStack& result, OperatorStack& operators, const ActualType& actual)
      {
        unsigned int passed_elements = CollectionConstraintEvaluator<ConstraintListType, ActualType>::Evaluate(*this, list, result, operators, actual);

         result.push(passed_elements == m_expected); 
      }

      unsigned int m_expected;
   };

  template<>
  struct Stringizer< ExactlyOperator >
  {
    static std::string ToString(const ExactlyOperator& op)
    {
      std::ostringstream stm;
      stm << "exactly " << op.m_expected;
      return stm.str();
    }
  };
}

#endif