xeval
- group xt_xeval
Evaluation functions.
Defined in
xtensor/xeval.hpp
Functions
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template<class T>
inline auto eval(T &&t) -> std::enable_if_t<detail::is_container<std::decay_t<T>>::value, T&&> Force evaluation of xexpression.
xt::xarray<double> a = {1, 2, 3, 4}; auto&& b = xt::eval(a); // b is a reference to a, no copy! auto&& c = xt::eval(a + b); // c is xarray<double>, not an xexpression
- Returns:
xt::xarray or xt::xtensor depending on shape type
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template<layout_type L = layout_type::any, class E>
inline auto as_strided(E &&e) -> std::enable_if_t<has_data_interface<std::decay_t<E>>::value && detail::has_same_layout<L, E>(), E&&> Force evaluation of xexpression not providing a data interface and convert to the required layout.
xt::xarray<double, xt::layout_type::row_major> a = {1, 2, 3, 4}; // take reference to a (no copy!) auto&& b = xt::as_strided(a); // xarray<double> with the required layout auto&& c = xt::as_strided<xt::layout_type::column_major>(a); // xexpression auto&& a_cast = xt::cast<int>(a); // xarray<int>, not an xexpression auto&& d = xt::as_strided(a_cast); // xarray<int> with the required layout auto&& e = xt::as_strided<xt::layout_type::column_major>(a_cast);
Warning
This function should be used in a local context only. Returning the value returned by this function could lead to a dangling reference.
- Returns:
The expression when it already provides a data interface with the correct layout, an evaluated xt::xarray or xt::xtensor depending on shape type otherwise.
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template<class T>