text: // Copyright (c) 2007, 2008 libmv authors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a copy
  // of this software and associated documentation files (the "Software"), to
  // deal in the Software without restriction, including without limitation the
  // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
  // sell copies of the Software, and to permit persons to whom the Software is
  // furnished to do so, subject to the following conditions:
  //
  // The above copyright notice and this permission notice shall be included in
  // all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  // IN THE SOFTWARE.
  
  #ifndef LIBMV_IMAGE_TUPLE_H
  #define LIBMV_IMAGE_TUPLE_H
  
  #include <algorithm>
  
  namespace libmv {
  
  // A vector of elements with fixed lenght and deep copy semantics.
  template <typename T, int N>
  class Tuple {
   public:
    enum { SIZE = N };
    Tuple() {}
    Tuple(T initial_value) { Reset(initial_value); }
  
    template <typename D>
    Tuple(D* values) {
      Reset(values);
    }
  
    template <typename D>
    Tuple(const Tuple<D, N>& b) {
      Reset(b);
    }
  
    template <typename D>
    Tuple& operator=(const Tuple<D, N>& b) {
      Reset(b);
      return *this;
    }
  
    template <typename D>
    void Reset(const Tuple<D, N>& b) {
      Reset(b.Data());
    }
  
    template <typename D>
    void Reset(D* values) {
      for (int i = 0; i < N; i++) {
        data_[i] = T(values[i]);
      }
    }
  
    // Set all tuple values to the same thing.
    void Reset(T value) {
      for (int i = 0; i < N; i++) {
        data_[i] = value;
      }
    }
  
    // Pointer to the first element.
    T* Data() { return &data_[0]; }
    const T* Data() const { return &data_[0]; }
  
    T& operator()(int i) { return data_[i]; }
    const T& operator()(int i) const { return data_[i]; }
  
    bool operator==(const Tuple<T, N>& other) const {
      for (int i = 0; i < N; ++i) {
        if ((*this)(i) != other(i)) {
          return false;
        }
      }
      return true;
    }
    bool operator!=(const Tuple<T, N>& other) const { return !(*this == other); }
  
   private:
    T data_[N];
  };
  
  }  // namespace libmv
  
  #endif  // LIBMV_IMAGE_TUPLE_H
  