/usr/include/boost/histogram/detail
Edit: /usr/include/boost/histogram/detail/argument_traits.hpp (2548B)
// 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_ARGUMENT_TRAITS_HPP
#define BOOST_HISTOGRAM_DETAIL_ARGUMENT_TRAITS_HPP
#include
#include
#include
#include
#include
namespace boost {
namespace histogram {
namespace detail {
template
struct is_weight_impl : mp11::mp_false {};
template
struct is_weight_impl> : mp11::mp_true {};
template
using is_weight = is_weight_impl;
template
struct is_sample_impl : mp11::mp_false {};
template
struct is_sample_impl> : mp11::mp_true {};
template
using is_sample = is_sample_impl;
template
struct sample_args_impl {
using type = mp11::mp_first= 0 ? Idx : 0)>>>;
};
template
struct sample_args_impl<-1, L> {
using type = std::tuple<>;
};
template
struct argument_traits_holder {
using nargs = mp11::mp_size_t;
using start = mp11::mp_size_t;
using wpos = mp11::mp_int;
using spos = mp11::mp_int;
using sargs = SampleArgs;
};
template
struct argument_traits_impl {
using list_ = mp11::mp_list;
static constexpr std::size_t size_ = sizeof...(Ts);
static constexpr std::size_t weight_ = mp11::mp_find_if::value;
static constexpr std::size_t sample_ = mp11::mp_find_if::value;
static constexpr int spos_ = (sample_ < size_ ? static_cast(sample_) : -1);
static constexpr int wpos_ = (weight_ < size_ ? static_cast(weight_) : -1);
using type =
argument_traits_holder<(size_ - (weight_ < size_) - (sample_ < size_)),
(weight_ < size_ && sample_ < size_ &&
(weight_ + sample_ < 2)
? 2
: ((weight_ == 0 || sample_ == 0) ? 1 : 0)),
wpos_, spos_, typename sample_args_impl::type>;
};
template
using argument_traits = typename argument_traits_impl::type;
} // namespace detail
} // namespace histogram
} // namespace boost
#endif