xoptional_assembly_base¶
Defined in xtensor/xoptional_assembly_base.hpp
-
template<class
D
>
classxoptional_assembly_base
: private xt::xiterable<D>¶ Base class for dense multidimensional optional assemblies.
The xoptional_assembly_base class defines the interface for dense multidimensional optional assembly classes. Optional assembly classes hold optional values and are optimized for tensor operations. xoptional_assembly_base does not embed any data container, this responsibility is delegated to the inheriting classes.
- Template Parameters
D
: The derived type, i.e. the inheriting class for which xoptional_assembly_base provides the interface.
Size and shape
-
auto
size
() const¶ Returns the number of element in the optional assembly.
-
auto constexpr
dimension
() const¶ Returns the number of dimensions of the optional assembly.
-
auto
shape
() const¶ Returns the shape of the optional assembly.
-
auto
shape
(size_type index) const¶ Returns the i-th dimension of the expression.
-
auto
strides
() const¶ Returns the strides of the optional assembly.
-
auto
backstrides
() const¶ Returns the backstrides of the optional assembly.
Data
-
template<class ...
Args
>
boolin_bounds
(Args... args) const¶ Returns
true
only if the the specified position is a valid entry in the expression.- Return
bool
- Parameters
args
: a list of indices specifying the position in the expression.
-
template<class ...
Args
>
autooperator()
(Args... args)¶ Returns a reference to the element at the specified position in the optional assembly.
- Parameters
args
: a list of indices specifying the position in the optional assembly. Indices must be unsigned integers, the number of indices should be equal or greater than the number of dimensions of the optional assembly.
-
template<class ...
Args
>
autooperator()
(Args... args) const¶ Returns a constant reference to the element at the specified position in the optional assembly.
- Parameters
args
: a list of indices specifying the position in the optional assembly. Indices must be unsigned integers, the number of indices should be equal or greater than the number of dimensions of the optional assembly.
-
template<class ...
Args
>
autoat
(Args... args)¶ Returns a reference to the element at the specified position in the optional assembly, after dimension and bounds checking.
- Parameters
args
: a list of indices specifying the position in the optional assembly. Indices must be unsigned integers, the number of indices should be equal to the number of dimensions of the optional assembly.
- Exceptions
std::out_of_range
: if the number of argument is greater than the number of dimensions or if indices are out of bounds.
-
template<class ...
Args
>
autoat
(Args... args) const¶ Returns a constant reference to the element at the specified position in the optional assembly, after dimension and bounds checking.
- Parameters
args
: a list of indices specifying the position in the optional assembly. Indices must be unsigned integers, the number of indices should be equal to the number of dimensions of the optional assembly.
- Exceptions
std::out_of_range
: if the number of argument is greater than the number of dimensions or if indices are out of bounds.
-
template<class ...
Args
>
autounchecked
(Args... args)¶ Returns a reference to the element at the specified position in the optional assembly.
- Warning
This method is meant for performance, for expressions with a dynamic number of dimensions (i.e. not known at compile time). Since it may have undefined behavior (see parameters), operator() should be prefered whenever it is possible.
- Warning
This method is NOT compatible with broadcasting, meaning the following code has undefined behavior:
xt::xarray<double> a = {{0, 1}, {2, 3}}; xt::xarray<double> b = {0, 1}; auto fd = a + b; double res = fd.uncheked(0, 1);
- Parameters
args
: a list of indices specifying the position in the optional assembly. Indices must be unsigned integers, the number of indices must be equal to the number of dimensions of the optional assembly, else the behavior is undefined.
-
template<class ...
Args
>
autounchecked
(Args... args) const¶ Returns a constant reference to the element at the specified position in the optional assembly.
- Warning
This method is meant for performance, for expressions with a dynamic number of dimensions (i.e. not known at compile time). Since it may have undefined behavior (see parameters), operator() should be prefered whenever it is possible.
- Warning
This method is NOT compatible with broadcasting, meaning the following code has undefined behavior:
xt::xarray<double> a = {{0, 1}, {2, 3}}; xt::xarray<double> b = {0, 1}; auto fd = a + b; double res = fd.uncheked(0, 1);
- Parameters
args
: a list of indices specifying the position in the optional assembly. Indices must be unsigned integers, the number of indices must be equal to the number of dimensions of the optional assembly, else the behavior is undefined.
-
template<class
S
>
autooperator[]
(const S &index)¶ Returns a reference to the element at the specified position in the optional assembly.
- Parameters
index
: a sequence of indices specifying the position in the optional assembly. Indices must be unsigned integers, the number of indices in the list should be equal or greater than the number of dimensions of the optional assembly.
-
template<class
S
>
autooperator[]
(const S &index) const¶ Returns a constant reference to the element at the specified position in the optional assembly.
- Parameters
index
: a sequence of indices specifying the position in the optional assembly. Indices must be unsigned integers, the number of indices in the list should be equal or greater than the number of dimensions of the optional assembly.
-
template<class ...
Args
>
autoperiodic
(Args... args)¶ Returns a reference to the element at the specified position in the optional assembly, after applying periodicity to the indices (negative and ‘overflowing’ indices are changed).
- Parameters
args
: a list of indices specifying the position in the optional assembly. Indices must be unsigned integers, the number of indices should be equal to the number of dimensions of the optional assembly.
-
template<class ...
Args
>
autoperiodic
(Args... args) const¶ Returns a constant reference to the element at the specified position in the optional assembly, after applying periodicity to the indices (negative and ‘overflowing’ indices are changed).
- Parameters
args
: a list of indices specifying the position in the optional assembly. Indices must be unsigned integers, the number of indices should be equal to the number of dimensions of the optional assembly.
-
template<class
It
>
autoelement
(It first, It last)¶ Returns a reference to the element at the specified position in the optional assembly.
- Parameters
first
: iterator starting the sequence of indiceslast
: iterator ending the sequence of indices The number of indices in the sequence should be equal to or greater than the number of dimensions of the optional assembly.
-
template<class
It
>
autoelement
(It first, It last) const¶ Returns a constant reference to the element at the specified position in the optional assembly.
- Parameters
first
: iterator starting the sequence of indiceslast
: iterator ending the sequence of indices The number of indices in the sequence should be equal to or greater than the number of dimensions of the optional assembly.
Broadcasting
-
template<class
S
>
boolbroadcast_shape
(S &shape, bool reuse_cache = false) const¶ Broadcast the shape of the optional assembly to the specified parameter.
- Return
a boolean indicating whether the broadcasting is trivial
- Parameters
shape
: the result shapereuse_cache
: parameter for internal optimization
-
template<class
S
>
boolhas_linear_assign
(const S &strides) const¶ Checks whether the xoptional_assembly_base can be linearly assigned to an expression with the specified strides.
- Return
a boolean indicating whether a linear assign is possible
Public Functions
-
template<class
S
= shape_type>
voidresize
(const S &shape, bool force = false)¶ Resizes the optional assembly.
- Parameters
shape
: the new shapeforce
: force reshaping, even if the shape stays the same (default: false)
-
template<class
S
= shape_type>
voidresize
(const S &shape, layout_type l)¶ Resizes the optional assembly.
- Parameters
shape
: the new shapel
: the new layout_type
-
template<class
S
= shape_type>
voidresize
(const S &shape, const strides_type &strides)¶ Resizes the optional assembly.
- Parameters
shape
: the new shapestrides
: the new strides
-
layout_type
layout
() const¶ Return the layout_type of the container.
- Return
layout_type of the container
-
template<class
T
>
voidfill
(const T &value)¶ Fills the data with the given value.
- Parameters
value
: the value to fill the data with.
-
auto
value
()¶ Return an expression for the values of the optional assembly.
-
auto
value
() const¶ Return a constant expression for the values of the optional assembly.
-
auto
has_value
()¶ Return an expression for the missing mask of the optional assembly.
-
auto
has_value
() const¶ Return a constant expression for the missing mask of the optional assembly.
-
template<class
S
>
auto &reshape
(const S &shape, layout_type layout) &¶ Reshapes the optional assembly.
- Parameters
shape
: the new shapelayout
: the new layout