TensorIndex< d1, d2, d3, d4 > Class Template Reference

#include <TensorIndex.h>

List of all members.

Public Types
enum	{ SIZE = d1*d2*d3*d4 }
enum	{ LEN1 = d1 }
enum	{ LEN2 = d2 }
enum	{ LEN3 = d3 }
enum	{ LEN4 = d4 }
Static Public Member Functions
static int	indexOf (const int i)
static int	indexOf (const int i, const int j, const int k, const int l)
static int	indexOf (const int i, const int j, const int k)
static int	indexOf (const int i, const int j)

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Detailed Description

template<int d1, int d2 = 1, int d3 = 1, int d4 = 1>
class TensorIndex< d1, d2, d3, d4 >

Credit: Utility class from

https://www.sitmo.com/doc/A_Simple_and_Extremely_Fast_CPP_Template_for_Matrices_and_Tensors

Usage:

The template below offers a simple and efficient solution for handling matrices and tensors in C++. The idea is to store the matrix (or tensor) in a standard vector by translating the multidimensional index to a one dimensional index.

The only thing we need to do is to convert two dimensional indices (r,c) into a one dimensional index. Using template we can do this very efficiently compile time, minimizing the runtime overhead.

Definition at line 16 of file TensorIndex.h.

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Member Enumeration Documentation

template<int d1, int d2 = 1, int d3 = 1, int d4 = 1>

anonymous enum

Enumerator:

SIZE

Definition at line 18 of file TensorIndex.h.

{SIZE = d1*d2*d3*d4 };

template<int d1, int d2 = 1, int d3 = 1, int d4 = 1>

anonymous enum

Enumerator:

LEN1

Definition at line 19 of file TensorIndex.h.

{LEN1 = d1 };

template<int d1, int d2 = 1, int d3 = 1, int d4 = 1>

anonymous enum

Enumerator:

LEN2

Definition at line 20 of file TensorIndex.h.

{LEN2 = d2 };

template<int d1, int d2 = 1, int d3 = 1, int d4 = 1>

anonymous enum

Enumerator:

LEN3

Definition at line 21 of file TensorIndex.h.

{LEN3 = d3 };

template<int d1, int d2 = 1, int d3 = 1, int d4 = 1>

anonymous enum

Enumerator:

LEN4

Definition at line 22 of file TensorIndex.h.

{LEN4 = d4 };

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Member Function Documentation

template<int d1, int d2 = 1, int d3 = 1, int d4 = 1>

static int TensorIndex< d1, d2, d3, d4 >::indexOf

(

const int

i

)

[inline, static]

Definition at line 24 of file TensorIndex.h.

References i.

Referenced by big::bigEntry::fill().

                                    {
      return i;
    }

template<int d1, int d2 = 1, int d3 = 1, int d4 = 1>

static int TensorIndex< d1, d2, d3, d4 >::indexOf	(	const int	i,
		const int	j,
		const int	k,
		const int	l
	)		[inline, static]

Definition at line 33 of file TensorIndex.h.

References i.

                                                                         {
      return ((l*d3 + k)*d2 + j)*d1 + i;
    }

template<int d1, int d2 = 1, int d3 = 1, int d4 = 1>

static int TensorIndex< d1, d2, d3, d4 >::indexOf	(	const int	i,
		const int	j,
		const int	k
	)		[inline, static]

Definition at line 30 of file TensorIndex.h.

References i.

                                                             {
      return (k*d2 + j)*d1 + i;
    }

template<int d1, int d2 = 1, int d3 = 1, int d4 = 1>

static int TensorIndex< d1, d2, d3, d4 >::indexOf	(	const int	i,
		const int	j
	)		[inline, static]

Definition at line 27 of file TensorIndex.h.

References i.

                                                {
      return j*d1 + i;
    }