text: /**
   * unique_matrix_filter.h
   * Copyright 2016 John Lawson
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   * 
   *     http://www.apache.org/licenses/LICENSE-2.0
   * 
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  #pragma once
  #ifndef REFL_UNIQUE_MATRIX_FILTER_H__
  #define REFL_UNIQUE_MATRIX_FILTER_H__
  
  #include <armadillo>
  #include <unordered_set>
  
  namespace refl {
  class UniqueMatrixFilter {
  	struct MatrixHash {
  		std::size_t
  		operator()(arma::Mat<int> const& m) const;
  	};
  	struct MatrixEqual {
  		bool
  		operator()(arma::Mat<int> const& lhs, arma::Mat<int> const& rhs) const;
  	};
  public:
  	bool
  	operator()(arma::Mat<int> const& m);
  private:
  	std::unordered_set<arma::Mat<int>, MatrixHash, MatrixEqual> _matrices;
  };
  }
  #endif
  
  