Modification

While the tensor template class and its auxiliary classes inherits the implementation style of the matrix and vector template class, they deviate in some points. This document shall give an overview of the changes.

Concept

Tensor

The methodsinsert or erase of the tensor concept are renamed by write and read.

Tensor Expression

I did not fully comprehend the reason behind the Matrix/Vector/Scalar Expression concepts, especially the functions and iterators of such. Therefore, I decided to postpone the development of expression concept for tensors.

Implementation

Tensor

• The current implementation of the tensor template class only compiles with compilers supporting C++17 mostly because constexpr if is used.
• Function max_size() in vector and matrix class is removed. It can still be queried through the underlying storage array. Note that max_size() is depcretated since C++17 for the std::vector.
• Functions like find_element() are put outside the tensor template class as free functions.
• All iterator structures are removed.
• Member function data() returns a pointer or const_pointer instead of an array_type.
• Data access functions are implemented with operator[] and function at().
• Function operator() will be used to select/project sections of tensors.
• Functions insert_element() and erase_element() will not be used.
• Function resize() will be renamed to reshape() using extents.
• Proxy shortcuts for tensor expressions are not used. It does not make user code more readible or convenient.
• Expression templates include tensor types as an additional template parameter.
• Arithmetic assignment operators are placed outside the tensor template class.
• Single-index access for fast tensor access included.
• Single-index access for tensor expression templates used instead of multi-index.

Tensor Expression

• Tensor expression template only returns a const reference to the derived expression type
• Binary and unary tensor expression templates only return a const reference with the access operator

Matrix Expression

• Single-Index Access included.

Matrix

• Single-Index Access included.

Unbounded Array

• Move copy constructor included.

Unit-Testing

Tensor

• The boost unit-test framework is dynamically linked.
• Unit-Tests are not executed when compiled.
• Renamed unit test folder according to the tested template classes and functions.
• Utilized some of the latest features of the boost unit-test framework version 1.67 such as fixtures and templates.
• Pragmas not included for unit testing.

Documentation

Tensor

• README for a better view changed.