xfunction

Defined in xtensor/xfunction.hpp

template <class F, class R, class... CT>
class xt::xfunction

Multidimensional function operating on xexpression.

Th xfunction class implements a multidimensional function operating on xexpression.

Template Parameters
  • F: the function type
  • R: the return type of the function
  • CT: the closure types for arguments of the function

Inherits from xt::xexpression< xfunction< F, R, CT... > >, xt::xconst_iterable< xfunction< F, R, CT... > >

Constructor

template <class Func>
xfunction(Func &&f, CT... e)

Constructs an xfunction applying the specified function to the given arguments.

Parameters
  • f: the function to apply
  • e: the xexpression arguments

Size and shape

auto size() const

Returns the size of the expression.

auto dimension() const

Returns the number of dimensions of the function.

auto shape() const

Returns the shape of the xfunction.

layout_type layout() const

Returns the layout_type of the xfunction.

Data

template <class... Args>
auto operator()(Args... args) const

Returns a constant reference to the element at the specified position in the function.

Parameters
  • args: a list of indices specifying the position in the function. Indices must be unsigned integers, the number of indices should be equal or greater than the number of dimensions of the function.

template <class It>
auto element(It first, It last) const

Returns a constant reference to the element at the specified position in the function.

Parameters
  • first: iterator starting the sequence of indices
  • last: iterator ending the sequence of indices The number of indices in the squence should be equal to or greater than the number of dimensions of the container.

Broadcasting

template <class S>
bool broadcast_shape(S &shape) const

Broadcast the shape of the function to the specified parameter.

Return
a boolean indicating whether the broadcasting is trivial
Parameters
  • shape: the result shape

template <class S>
bool is_trivial_broadcast(const S &strides) const

Compares the specified strides with those of the container to see whether the broadcasting is trivial.

Return
a boolean indicating whether the broadcasting is trivial

Iterators

auto begin() const

Returns an iterator to the first element of the buffer containing the elements of the function.

auto end() const

Returns a constant iterator to the element following the last element of the buffer containing the elements of the function.

auto cbegin() const

Returns a constant iterator to the first element of the buffer containing the elements of the function.

auto cend() const

Returns a constant iterator to the element following the last element of the buffer containing the elements of the function.

Reverse Iterators

auto rbegin() const

Returns an iterator to the first element of the reversed buffer containing the elements of the function.

auto rend() const

Returns a constant iterator to the element following the last element of the reversed buffer containing the elements of the function.

auto crbegin() const

Returns an iterator to the first element of the reversed buffer containing the elements of the function.

auto crend() const

Returns a constant iterator to the element following the last element of the reversed buffer containing the elements of the function.