PlainMatrix.h

Go to the documentation of this file.

// This file is part of libigl, a simple c++ geometry processing library.
// 
// Copyright (C) 2024 Alec Jacobson <alecjacobson@gmail.com>
// 
// This Source Code Form is subject to the terms of the Mozilla Public License 
// v. 2.0. If a copy of the MPL was not distributed with this file, You can 
// obtain one at http://mozilla.org/MPL/2.0/.
 
#ifndef IGL_PLAINMATRIX_H
#define IGL_PLAINMATRIX_H
#include <Eigen/Core>
 
#include <type_traits>
#include <Eigen/Dense>
 
// Define void_t for compatibility if it's not in the standard library (C++11 and later)
#if __cplusplus < 201703L
namespace std {
  template <typename... Ts>
  using void_t = void;
}
#endif
 
 
#ifndef IGL_DEFAULT_MAJORING
#define IGL_DEFAULT_MAJORING Eigen::ColMajor
#endif
 
namespace igl
{
  template <typename Derived, int Rows, int Cols, int Options>
  struct PlainMatrixHelper {
    using Type = Eigen::Matrix<typename Derived::Scalar,Rows,Cols,((Rows == 1 && Cols != 1) ? Eigen::RowMajor : ((Cols == 1 && Rows != 1) ? Eigen::ColMajor : Options))>;
  };
  template <typename Derived, typename = void>
  struct get_options {
    static constexpr int value = IGL_DEFAULT_MAJORING;
  };
  
  template <typename Derived>
  struct get_options<Derived, std::void_t<decltype(Derived::Options)>> {
    static constexpr int value = Derived::Options;
  };

  // Helper to check if `Options` exists in Derived
 
  // Modify PlainMatrix to use get_options
  template <typename Derived, 
            int Rows = Derived::RowsAtCompileTime, 
            int Cols = Derived::ColsAtCompileTime, 
            int Options = get_options<Derived>::value>
  using PlainMatrix = typename PlainMatrixHelper<Derived, Rows, Cols, Options>::Type;
 
}
 
#endif