C++ 实例化后向可变模板类型添加内容

电流源

在代码的这一点上，我有一个可变模板类：

template<typename ClassType, std::size_t... Args>
class Matrix {
private:
    DimensionPack<Args...> dp;

public:
    Matrix<ClassType, Args...>(){} // Default

    // Public Access Members To Get Information From the DimensionPack which is based
    // Not On The Type But Based On The Amount & Values Of This Template's Variadic Parameters
    std::vector<unsigned int>& getDimensions() { return dp.dimensions;  }
    std::vector<unsigned int>& getEvenOrOdd() { return dp.even_or_odd; }
    const unsigned int getNumberOfDimensions() const { return dp.total_dimensions; }
    const unsigned int getTotalNumElements() const { return dp.total_elements; }

};

此时，在我的

矩阵

类中，我能够成功编译并获得预期的结果，例如在以下情况下：

使用示例：

Matrix<float, 1> mat1;   // Single Element Matrix - Considered A Scalar Type
Matrix<float, 1,1...> mat1...; // Again - Single Element Matrix - Considered  A Scalar Type
Matrix<float, n, m, 1, p> matNM1P; // Where n,m,p are > 1 makes that field of dimensionality flat such as a linear array or vector.
Matrix<float, 2,2> mat2x2; // creates a 2x2 Matrix with 4 elements of type float
Matrix<int, 3,3,3> mat3x3x3; // creates a 3x3x3 Volumetric Matrix with 27 elements of type int.
Matrix<type,n...> mat_multidimensional; // creates any higher order dimension of type.

• 我应该只接受一个固定大小的向量吗 匹配元素总数并创建索引方案

---

• 如果您知道编译时的大小，而不是使用

  std:：vector，我应该使用嵌套
  s@W.F.大小来自模板的可变列表，该列表恰好是
  std:：size\u t…
  模板实例化显示了大小，例如
  矩阵
  将为您提供2维内的MxN元素和
  Matrix
  将为您提供三维内的MxNxO元素。而且没有固定数量的维度，因此理论上它可以是100维矩阵，但由于数据类型和它们可以包含的值的限制，硬件不会支持它。因此，你知道编译时的大小。在这种情况下，使用数组将更合适…@W.F.ty对于建议，我必须尝试一下。
  Matrix<float, 1> mat1;   // Single Element Matrix - Considered A Scalar Type
  Matrix<float, 1,1...> mat1...; // Again - Single Element Matrix - Considered  A Scalar Type
  Matrix<float, n, m, 1, p> matNM1P; // Where n,m,p are > 1 makes that field of dimensionality flat such as a linear array or vector.
  Matrix<float, 2,2> mat2x2; // creates a 2x2 Matrix with 4 elements of type float
  Matrix<int, 3,3,3> mat3x3x3; // creates a 3x3x3 Volumetric Matrix with 27 elements of type int.
  Matrix<type,n...> mat_multidimensional; // creates any higher order dimension of type.
  
  template<typename type, std::size_t... dims>
  void testMatrix( Matrix<type, dims...> matrix ) {
      std::cout << "The Matrix Has " << matrix.getNumberOfDimensions() << " Total Dimensions:\n";
      std::cout << "The Dimensions Are:\n";
      for ( unsigned u = 0; u < matrix.getDimensions().size(); u++ ) {
          std::cout << matrix.getDimensions()[u] << " ";
      }
      std::cout << std::endl;
  
      std::cout << "The even and odd of each dimension are:\n";
      for ( unsigned u = 0; u < matrix.getEvenOrOdd().size(); u++ ) {
          std::cout << matrix.getEvenOrOdd()[u] << " ";
      }
      std::cout << std::endl;
  
      std::cout << "The Matrix Has " << matrix.getTotalNumElements() << " total elements.\n\n";
  }
  
  #include <Matrix.h>
  
  int main() {
      Matrix<float, 2, 3, 4> mat;
      testMatrix( mat );
  
      Matrix<int, 7, 9, 13, 15, 17> mat2;
      testMatrix( mat2 );
  
      Matrix<double, 255,255,255,255,255,255,255,255,255> mat9;
      testMatrix( mat9 );
  
      return 0;
  }
  
  Matrix<float, 4,4,4> mat4x4x4;  // A 3D Volumetric Matrix With 256 Elements
  Matrix<float, 2,3,5> mat2x3x5;  // A 3D Volumetric Matrix With 30 Elements
  Matrix<float, 5,7,8,10> mat5x7x8x10; // A 4D Volumetric Matrix With 2800 Elements