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- // Copyright 2015-2019 Hans Dembinski
- //
- // Distributed under the Boost Software License, Version 1.0.
- // (See accompanying file LICENSE_1_0.txt
- // or copy at http://www.boost.org/LICENSE_1_0.txt)
- #ifndef BOOST_HISTOGRAM_DETAIL_DETECT_HPP
- #define BOOST_HISTOGRAM_DETAIL_DETECT_HPP
- #include <boost/histogram/fwd.hpp>
- #include <boost/mp11/algorithm.hpp>
- #include <boost/mp11/function.hpp>
- #include <boost/mp11/utility.hpp>
- #include <boost/variant2/variant.hpp>
- #include <iterator>
- #include <tuple>
- #include <type_traits>
- namespace boost {
- namespace histogram {
- namespace detail {
- #define BOOST_HISTOGRAM_DETAIL_DETECT(name, cond) \
- template <class T> \
- using name##_impl = decltype(cond); \
- template <class T> \
- using name = typename boost::mp11::mp_valid<name##_impl, T>::type
- #define BOOST_HISTOGRAM_DETAIL_DETECT_BINARY(name, cond) \
- template <class T, class U> \
- using name##_impl = decltype(cond); \
- template <class T, class U = T> \
- using name = typename boost::mp11::mp_valid<name##_impl, T, U>::type
- // metadata has overloads, trying to get pmf in this case always fails
- BOOST_HISTOGRAM_DETAIL_DETECT(has_method_metadata, (std::declval<T&>().metadata()));
- // resize has overloads, trying to get pmf in this case always fails
- BOOST_HISTOGRAM_DETAIL_DETECT(has_method_resize, (std::declval<T&>().resize(0)));
- BOOST_HISTOGRAM_DETAIL_DETECT(has_method_size, &T::size);
- BOOST_HISTOGRAM_DETAIL_DETECT(has_method_clear, &T::clear);
- BOOST_HISTOGRAM_DETAIL_DETECT(has_method_lower, &T::lower);
- BOOST_HISTOGRAM_DETAIL_DETECT(has_method_value, &T::value);
- BOOST_HISTOGRAM_DETAIL_DETECT(has_method_update, &T::update);
- // reset has overloads, trying to get pmf in this case always fails
- BOOST_HISTOGRAM_DETAIL_DETECT(has_method_reset, (std::declval<T>().reset(0)));
- BOOST_HISTOGRAM_DETAIL_DETECT(has_method_options, &T::options);
- BOOST_HISTOGRAM_DETAIL_DETECT(has_allocator, &T::get_allocator);
- BOOST_HISTOGRAM_DETAIL_DETECT(is_indexable, (std::declval<T&>()[0]));
- BOOST_HISTOGRAM_DETAIL_DETECT_BINARY(
- is_transform,
- (std::declval<T&>().inverse(std::declval<T&>().forward(std::declval<U>()))));
- BOOST_HISTOGRAM_DETAIL_DETECT(is_indexable_container, (std::declval<T>()[0], &T::size,
- std::begin(std::declval<T>()),
- std::end(std::declval<T>())));
- BOOST_HISTOGRAM_DETAIL_DETECT(is_vector_like,
- (std::declval<T>()[0], &T::size,
- std::declval<T>().resize(0), std::begin(std::declval<T>()),
- std::end(std::declval<T>())));
- BOOST_HISTOGRAM_DETAIL_DETECT(is_array_like,
- (std::declval<T>()[0], &T::size, std::tuple_size<T>::value,
- std::begin(std::declval<T>()),
- std::end(std::declval<T>())));
- BOOST_HISTOGRAM_DETAIL_DETECT(is_map_like, (std::declval<typename T::key_type>(),
- std::declval<typename T::mapped_type>(),
- std::begin(std::declval<T>()),
- std::end(std::declval<T>())));
- // ok: is_axis is false for axis::variant, because T::index is templated
- BOOST_HISTOGRAM_DETAIL_DETECT(is_axis, (&T::size, &T::index));
- BOOST_HISTOGRAM_DETAIL_DETECT(is_iterable, (std::begin(std::declval<T&>()),
- std::end(std::declval<T&>())));
- BOOST_HISTOGRAM_DETAIL_DETECT(is_iterator,
- (typename std::iterator_traits<T>::iterator_category()));
- BOOST_HISTOGRAM_DETAIL_DETECT(is_streamable,
- (std::declval<std::ostream&>() << std::declval<T&>()));
- BOOST_HISTOGRAM_DETAIL_DETECT(has_operator_preincrement, (++std::declval<T&>()));
- BOOST_HISTOGRAM_DETAIL_DETECT_BINARY(has_operator_equal, (std::declval<const T&>() ==
- std::declval<const U>()));
- BOOST_HISTOGRAM_DETAIL_DETECT_BINARY(has_operator_radd,
- (std::declval<T&>() += std::declval<U>()));
- BOOST_HISTOGRAM_DETAIL_DETECT_BINARY(has_operator_rsub,
- (std::declval<T&>() -= std::declval<U>()));
- BOOST_HISTOGRAM_DETAIL_DETECT_BINARY(has_operator_rmul,
- (std::declval<T&>() *= std::declval<U>()));
- BOOST_HISTOGRAM_DETAIL_DETECT_BINARY(has_operator_rdiv,
- (std::declval<T&>() /= std::declval<U>()));
- BOOST_HISTOGRAM_DETAIL_DETECT_BINARY(
- has_method_eq, (std::declval<const T>().operator==(std::declval<const U>())));
- BOOST_HISTOGRAM_DETAIL_DETECT(has_threading_support, (T::has_threading_support));
- template <class T>
- using is_storage = mp11::mp_and<is_indexable_container<T>, has_method_reset<T>,
- has_threading_support<T>>;
- template <class T>
- using is_adaptible =
- mp11::mp_and<mp11::mp_not<is_storage<T>>,
- mp11::mp_or<is_vector_like<T>, is_array_like<T>, is_map_like<T>>>;
- template <class T>
- struct is_tuple_impl : mp11::mp_false {};
- template <class... Ts>
- struct is_tuple_impl<std::tuple<Ts...>> : mp11::mp_true {};
- template <class T>
- using is_tuple = typename is_tuple_impl<T>::type;
- template <class T>
- struct is_variant_impl : mp11::mp_false {};
- template <class... Ts>
- struct is_variant_impl<boost::variant2::variant<Ts...>> : mp11::mp_true {};
- template <class T>
- using is_variant = typename is_variant_impl<T>::type;
- template <class T>
- struct is_axis_variant_impl : mp11::mp_false {};
- template <class... Ts>
- struct is_axis_variant_impl<axis::variant<Ts...>> : mp11::mp_true {};
- template <class T>
- using is_axis_variant = typename is_axis_variant_impl<T>::type;
- template <class T>
- using is_any_axis = mp11::mp_or<is_axis<T>, is_axis_variant<T>>;
- template <class T>
- using is_sequence_of_axis = mp11::mp_and<is_iterable<T>, is_axis<mp11::mp_first<T>>>;
- template <class T>
- using is_sequence_of_axis_variant =
- mp11::mp_and<is_iterable<T>, is_axis_variant<mp11::mp_first<T>>>;
- template <class T>
- using is_sequence_of_any_axis =
- mp11::mp_and<is_iterable<T>, is_any_axis<mp11::mp_first<T>>>;
- // poor-mans concept checks
- template <class T, class = std::enable_if_t<is_storage<std::decay_t<T>>::value>>
- struct requires_storage {};
- template <class T, class _ = std::decay_t<T>,
- class = std::enable_if_t<(is_storage<_>::value || is_adaptible<_>::value)>>
- struct requires_storage_or_adaptible {};
- template <class T, class = std::enable_if_t<is_iterator<std::decay_t<T>>::value>>
- struct requires_iterator {};
- template <class T, class = std::enable_if_t<
- is_iterable<std::remove_cv_t<std::remove_reference_t<T>>>::value>>
- struct requires_iterable {};
- template <class T, class = std::enable_if_t<is_axis<std::decay_t<T>>::value>>
- struct requires_axis {};
- template <class T, class = std::enable_if_t<is_any_axis<std::decay_t<T>>::value>>
- struct requires_any_axis {};
- template <class T, class = std::enable_if_t<is_sequence_of_axis<std::decay_t<T>>::value>>
- struct requires_sequence_of_axis {};
- template <class T,
- class = std::enable_if_t<is_sequence_of_axis_variant<std::decay_t<T>>::value>>
- struct requires_sequence_of_axis_variant {};
- template <class T,
- class = std::enable_if_t<is_sequence_of_any_axis<std::decay_t<T>>::value>>
- struct requires_sequence_of_any_axis {};
- template <class T,
- class = std::enable_if_t<is_any_axis<mp11::mp_first<std::decay_t<T>>>::value>>
- struct requires_axes {};
- template <class T, class U, class = std::enable_if_t<std::is_convertible<T, U>::value>>
- struct requires_convertible {};
- template <class T, class U,
- class = std::enable_if_t<is_transform<std::decay_t<T>, U>::value>>
- struct requires_transform {};
- } // namespace detail
- } // namespace histogram
- } // namespace boost
- #endif
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