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/***************************************************************************
* Copyright (c) Johan Mabille, Sylvain Corlay and Wolf Vollprecht *
* Copyright (c) QuantStack *
* *
* Distributed under the terms of the BSD 3-Clause License. *
* *
* The full license is in the file LICENSE, distributed with this software. *
****************************************************************************/
#include <cstddef>
#include "xtensor/xexpression.hpp"
#include "xtensor/xio.hpp"
#include "xtensor/xtensor.hpp"
#include "xtensor/xview.hpp"
#include "test_common_macros.hpp"
struct field_expression_tag
{
};
template <class D>
class field_expression : public xt::xexpression<D>
{
public:
using expression_tag = field_expression_tag;
};
template <class F, class... CT>
class field_function : public field_expression<field_function<F, CT...>>
{
public:
using self_type = field_function<F, CT...>;
using functor_type = std::remove_reference_t<F>;
using expression_tag = field_expression_tag;
template <class Func, class... CTA, class U = std::enable_if<!std::is_base_of<Func, self_type>::value>>
field_function(Func&& f, CTA&&... e) noexcept
: m_e(std::forward<CTA>(e)...)
, m_f(std::forward<Func>(f))
{
}
template <class... T>
auto operator()(const std::size_t begin, const std::size_t end) const
{
return evaluate(std::make_index_sequence<sizeof...(CT)>(), begin, end);
}
template <std::size_t... I, class... T>
auto evaluate(std::index_sequence<I...>, T&&... t) const
{
return m_f(std::get<I>(m_e).operator()(std::forward<T>(t)...)...);
}
private:
std::tuple<CT...> m_e;
functor_type m_f;
};
namespace xt
{
namespace detail
{
template <class F, class... E>
struct select_xfunction_expression<field_expression_tag, F, E...>
{
using type = field_function<F, E...>;
};
}
}
// using xt::operator+;
// using xt::operator-;
// using xt::operator*;
// using xt::operator/;
// using xt::operator%;
struct Field : public field_expression<Field>
{
Field()
: m_data(std::array<std::size_t, 1>{10})
{
}
auto operator()(const std::size_t begin, const std::size_t end) const
{
return xt::view(m_data, xt::range(begin, end));
}
auto operator()(const std::size_t begin, const std::size_t end)
{
return xt::view(m_data, xt::range(begin, end));
}
template <class E>
Field& operator=(const field_expression<E>& e)
{
(*this)(0, 5) = e.derived_cast()(0, 5);
return *this;
}
xt::xtensor<double, 1> m_data;
};
TEST(xfunc_on_xexpression, field_expression)
{
Field x, y;
xt::xtensor<double, 1> res{{20, 20, 20, 20, 20, 0, 0, 0, 0, 0}};
x.m_data.fill(10);
y.m_data.fill(0);
y = x + x;
EXPECT_EQ(y.m_data, res);
}
TEST(xfunc_on_xexpression, copy_constructor)
{
// Compilation test only
// checks that there is no ambiguity among xfunction constructors
xt::xtensor<double, 1> x{{1, 2}}, y{{3, 4}};
xt::xtensor<double, 1> res{{4, 6}};
auto expr = x + y;
decltype(expr) expr2{expr};
EXPECT_EQ(xt::eval(expr2), res);
}
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