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https://github.com/PurpleI2P/Boost-for-Android-Prebuilt
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215 lines
7.9 KiB
C++
215 lines
7.9 KiB
C++
// Copyright 2015-2019 Hans Dembinski
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt
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// or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_HISTOGRAM_DETAIL_DETECT_HPP
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#define BOOST_HISTOGRAM_DETAIL_DETECT_HPP
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#include <boost/histogram/fwd.hpp>
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#include <boost/mp11/algorithm.hpp>
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#include <boost/mp11/function.hpp>
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#include <boost/mp11/utility.hpp>
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#include <boost/variant2/variant.hpp>
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#include <iterator>
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#include <tuple>
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#include <type_traits>
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namespace boost {
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namespace histogram {
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namespace detail {
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#define BOOST_HISTOGRAM_DETAIL_DETECT(name, cond) \
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template <class T> \
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using name##_impl = decltype(cond); \
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template <class T> \
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using name = typename boost::mp11::mp_valid<name##_impl, T>::type
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#define BOOST_HISTOGRAM_DETAIL_DETECT_BINARY(name, cond) \
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template <class T, class U> \
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using name##_impl = decltype(cond); \
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template <class T, class U = T> \
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using name = typename boost::mp11::mp_valid<name##_impl, T, U>::type
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// metadata has overloads, trying to get pmf in this case always fails
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BOOST_HISTOGRAM_DETAIL_DETECT(has_method_metadata, (std::declval<T&>().metadata()));
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// resize has overloads, trying to get pmf in this case always fails
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BOOST_HISTOGRAM_DETAIL_DETECT(has_method_resize, (std::declval<T&>().resize(0)));
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BOOST_HISTOGRAM_DETAIL_DETECT(has_method_size, &T::size);
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BOOST_HISTOGRAM_DETAIL_DETECT(has_method_clear, &T::clear);
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BOOST_HISTOGRAM_DETAIL_DETECT(has_method_lower, &T::lower);
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BOOST_HISTOGRAM_DETAIL_DETECT(has_method_value, &T::value);
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BOOST_HISTOGRAM_DETAIL_DETECT(has_method_update, &T::update);
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// reset has overloads, trying to get pmf in this case always fails
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BOOST_HISTOGRAM_DETAIL_DETECT(has_method_reset, (std::declval<T>().reset(0)));
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BOOST_HISTOGRAM_DETAIL_DETECT(has_method_options, &T::options);
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BOOST_HISTOGRAM_DETAIL_DETECT(has_allocator, &T::get_allocator);
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BOOST_HISTOGRAM_DETAIL_DETECT(is_indexable, (std::declval<T&>()[0]));
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BOOST_HISTOGRAM_DETAIL_DETECT_BINARY(
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is_transform,
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(std::declval<T&>().inverse(std::declval<T&>().forward(std::declval<U>()))));
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BOOST_HISTOGRAM_DETAIL_DETECT(is_indexable_container, (std::declval<T>()[0], &T::size,
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std::begin(std::declval<T>()),
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std::end(std::declval<T>())));
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BOOST_HISTOGRAM_DETAIL_DETECT(is_vector_like,
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(std::declval<T>()[0], &T::size,
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std::declval<T>().resize(0), std::begin(std::declval<T>()),
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std::end(std::declval<T>())));
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BOOST_HISTOGRAM_DETAIL_DETECT(is_array_like,
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(std::declval<T>()[0], &T::size, std::tuple_size<T>::value,
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std::begin(std::declval<T>()),
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std::end(std::declval<T>())));
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BOOST_HISTOGRAM_DETAIL_DETECT(is_map_like, (std::declval<typename T::key_type>(),
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std::declval<typename T::mapped_type>(),
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std::begin(std::declval<T>()),
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std::end(std::declval<T>())));
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// ok: is_axis is false for axis::variant, because T::index is templated
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BOOST_HISTOGRAM_DETAIL_DETECT(is_axis, (&T::size, &T::index));
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BOOST_HISTOGRAM_DETAIL_DETECT(is_iterable, (std::begin(std::declval<T&>()),
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std::end(std::declval<T&>())));
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BOOST_HISTOGRAM_DETAIL_DETECT(is_iterator,
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(typename std::iterator_traits<T>::iterator_category()));
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BOOST_HISTOGRAM_DETAIL_DETECT(is_streamable,
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(std::declval<std::ostream&>() << std::declval<T&>()));
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BOOST_HISTOGRAM_DETAIL_DETECT(has_operator_preincrement, (++std::declval<T&>()));
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BOOST_HISTOGRAM_DETAIL_DETECT_BINARY(has_operator_equal, (std::declval<const T&>() ==
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std::declval<const U>()));
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BOOST_HISTOGRAM_DETAIL_DETECT_BINARY(has_operator_radd,
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(std::declval<T&>() += std::declval<U>()));
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BOOST_HISTOGRAM_DETAIL_DETECT_BINARY(has_operator_rsub,
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(std::declval<T&>() -= std::declval<U>()));
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BOOST_HISTOGRAM_DETAIL_DETECT_BINARY(has_operator_rmul,
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(std::declval<T&>() *= std::declval<U>()));
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BOOST_HISTOGRAM_DETAIL_DETECT_BINARY(has_operator_rdiv,
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(std::declval<T&>() /= std::declval<U>()));
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BOOST_HISTOGRAM_DETAIL_DETECT_BINARY(
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has_method_eq, (std::declval<const T>().operator==(std::declval<const U>())));
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BOOST_HISTOGRAM_DETAIL_DETECT(has_threading_support, (T::has_threading_support));
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template <class T>
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using is_storage = mp11::mp_and<is_indexable_container<T>, has_method_reset<T>,
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has_threading_support<T>>;
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template <class T>
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using is_adaptible =
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mp11::mp_and<mp11::mp_not<is_storage<T>>,
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mp11::mp_or<is_vector_like<T>, is_array_like<T>, is_map_like<T>>>;
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template <class T>
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struct is_tuple_impl : mp11::mp_false {};
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template <class... Ts>
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struct is_tuple_impl<std::tuple<Ts...>> : mp11::mp_true {};
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template <class T>
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using is_tuple = typename is_tuple_impl<T>::type;
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template <class T>
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struct is_variant_impl : mp11::mp_false {};
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template <class... Ts>
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struct is_variant_impl<boost::variant2::variant<Ts...>> : mp11::mp_true {};
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template <class T>
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using is_variant = typename is_variant_impl<T>::type;
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template <class T>
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struct is_axis_variant_impl : mp11::mp_false {};
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template <class... Ts>
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struct is_axis_variant_impl<axis::variant<Ts...>> : mp11::mp_true {};
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template <class T>
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using is_axis_variant = typename is_axis_variant_impl<T>::type;
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template <class T>
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using is_any_axis = mp11::mp_or<is_axis<T>, is_axis_variant<T>>;
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template <class T>
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using is_sequence_of_axis = mp11::mp_and<is_iterable<T>, is_axis<mp11::mp_first<T>>>;
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template <class T>
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using is_sequence_of_axis_variant =
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mp11::mp_and<is_iterable<T>, is_axis_variant<mp11::mp_first<T>>>;
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template <class T>
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using is_sequence_of_any_axis =
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mp11::mp_and<is_iterable<T>, is_any_axis<mp11::mp_first<T>>>;
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// poor-mans concept checks
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template <class T, class = std::enable_if_t<is_storage<std::decay_t<T>>::value>>
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struct requires_storage {};
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template <class T, class _ = std::decay_t<T>,
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class = std::enable_if_t<(is_storage<_>::value || is_adaptible<_>::value)>>
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struct requires_storage_or_adaptible {};
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template <class T, class = std::enable_if_t<is_iterator<std::decay_t<T>>::value>>
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struct requires_iterator {};
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template <class T, class = std::enable_if_t<
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is_iterable<std::remove_cv_t<std::remove_reference_t<T>>>::value>>
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struct requires_iterable {};
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template <class T, class = std::enable_if_t<is_axis<std::decay_t<T>>::value>>
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struct requires_axis {};
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template <class T, class = std::enable_if_t<is_any_axis<std::decay_t<T>>::value>>
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struct requires_any_axis {};
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template <class T, class = std::enable_if_t<is_sequence_of_axis<std::decay_t<T>>::value>>
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struct requires_sequence_of_axis {};
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template <class T,
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class = std::enable_if_t<is_sequence_of_axis_variant<std::decay_t<T>>::value>>
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struct requires_sequence_of_axis_variant {};
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template <class T,
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class = std::enable_if_t<is_sequence_of_any_axis<std::decay_t<T>>::value>>
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struct requires_sequence_of_any_axis {};
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template <class T,
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class = std::enable_if_t<is_any_axis<mp11::mp_first<std::decay_t<T>>>::value>>
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struct requires_axes {};
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template <class T, class U, class = std::enable_if_t<std::is_convertible<T, U>::value>>
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struct requires_convertible {};
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template <class T, class U,
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class = std::enable_if_t<is_transform<std::decay_t<T>, U>::value>>
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struct requires_transform {};
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} // namespace detail
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} // namespace histogram
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} // namespace boost
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#endif
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