12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364 |
- // Copyright 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_ACCUMULATOR_TRAITS_HPP
- #define BOOST_HISTOGRAM_DETAIL_ACCUMULATOR_TRAITS_HPP
- #include <boost/histogram/fwd.hpp>
- #include <tuple>
- #include <type_traits>
- namespace boost {
- namespace accumulators {
- template <class, class, class>
- struct accumulator_set;
- }
- namespace histogram {
- namespace detail {
- template <bool WeightSupport, class... Ts>
- struct accumulator_traits_holder {
- using wsupport = std::integral_constant<bool, WeightSupport>;
- using args = std::tuple<Ts...>;
- };
- template <class R, class T, class U, class... Ts>
- accumulator_traits_holder<true, Ts...> accumulator_traits_impl_2(
- R (T::*)(boost::histogram::weight_type<U>, Ts...));
- template <class R, class T, class U, class... Ts>
- accumulator_traits_holder<true, Ts...> accumulator_traits_impl_2(
- R (T::*)(boost::histogram::weight_type<U>&&, Ts...));
- template <class R, class T, class U, class... Ts>
- accumulator_traits_holder<true, Ts...> accumulator_traits_impl_2(
- R (T::*)(const boost::histogram::weight_type<U>&, Ts...));
- template <class R, class T, class... Ts>
- accumulator_traits_holder<false, Ts...> accumulator_traits_impl_2(R (T::*)(Ts...));
- template <class T>
- auto accumulator_traits_impl(T&)
- -> decltype(std::declval<T&>() += 0, accumulator_traits_holder<true>{});
- template <class T>
- auto accumulator_traits_impl(T&) -> decltype(accumulator_traits_impl_2(&T::operator()));
- // for boost.accumulators compatibility
- template <class S, class F, class W>
- accumulator_traits_holder<false, S> accumulator_traits_impl(
- boost::accumulators::accumulator_set<S, F, W>&);
- template <class T>
- using accumulator_traits = decltype(accumulator_traits_impl(std::declval<T&>()));
- } // namespace detail
- } // namespace histogram
- } // namespace boost
- #endif
|