Generator

template<typename CoefficientPrecision>
class VirtualGenerator

Define the interface for the user to give Htool a function generating dense sub-blocks of the global matrix the user wants to compress. This is done by the user implementing VirtualGenerator::copy_submatrix.

Template Parameters:

CoefficientPrecision – Precision of the coefficients (float, double,…)

Public Functions

virtual void copy_submatrix(int M, int N, const int *rows, const int *cols, CoefficientPrecision *ptr) const = 0

Generate a dense sub-block of the global matrix the user wants to compress. Note that sub-blocks queried by Htool are potentially non-contiguous in the user’s numbering.

Parameters:

• M – [in] specifies the number of columns of the queried block

• N – [in] specifies the number of rows of the queried block

• rows – [in] is an integer array of size \(M\). It specifies the queried columns in the user’s numbering

• cols – [in] is an integer array of size \(N\). It specifies the queried rows in the user’s numbering

• ptr – [out] is a CoefficientPrecision precision array of size \( M\times N\). Htool already allocates and desallocates it internally, so it should not be allocated by the user.

inline VirtualGenerator()

VirtualGenerator(const VirtualGenerator&) = default

VirtualGenerator &operator=(const VirtualGenerator&) = default

VirtualGenerator(VirtualGenerator&&) = default

VirtualGenerator &operator=(VirtualGenerator&&) = default

inline virtual ~VirtualGenerator()