# xfunctor_view¶

Defined in xtensor/xfunctor_view.hpp

template<class F, class CT>
class xfunctor_view : public xt::xfunctor_applier_base<xfunctor_view<F, CT>>, public xt::xview_semantic<xfunctor_view<F, CT>>, public extension::xfunctor_view_base_t<F, CT>

View of an xexpression .

The xfunctor_view class is an expression addressing its elements by applying a functor to the corresponding element of an underlying expression. Unlike e.g. xgenerator, an xfunctor_view is an lvalue. It is used e.g. to access real and imaginary parts of complex expressions.

xfunctor_view has a view semantics and can be used on any expression. For a similar feature with a container semantics, one can use xfunctor_adaptor.

xfunctor_view is not meant to be used directly, but through helper functions such as real or imag.

See
Template Parameters
• F: the functor type to be applied to the elements of specified expression.

• CT: the closure type of the xexpression type underlying this view

Extended copy semantic

template<class E>
auto operator=(const xexpression<E> &e)

The extended assignment operator.

Defined in xtensor/xcomplex.hpp

template<class E>
decltype(auto) xt::real(E &&e)

Returns an xexpression representing the real part of the given expression.

The returned expression either hold a const reference to

e or a copy depending on whether e is an lvalue or an rvalue.
Template Parameters

template<class E>
decltype(auto) xt::imag(E &&e)

Returns an xexpression representing the imaginary part of the given expression.

The returned expression either hold a const reference to

e or a copy depending on whether e is an lvalue or an rvalue.
Template Parameters