selector_signature_check.hpp

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// This file is part of the Acts project.
//
// Copyright (C) 2018 CERN for the benefit of the Acts project
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#pragma once

#include "Acts/Utilities/detail/MPL/type_collector.hpp"
#include <type_traits>

namespace Fatras {

namespace detail {

namespace {
template <typename T, typename detector_t, typename particle_t,
          typename = decltype(
              std::declval<T>().operator()(std::declval<const detector_t &>(),
                                           std::declval<const particle_t &>()))>

std::true_type test_selector_list(int);

template <typename, typename, typename> std::false_type test_selector_list(...);

template <typename T, typename detector_t, typename particle_t>
struct selector_list_signature_check
    : decltype(test_selector_list<T, detector_t, particle_t>(0)) {};

} // end of anonymous namespace

template <typename T, typename detector_t, typename particle_t>
constexpr bool selector_list_signature_check_v =
    selector_list_signature_check<T, detector_t, particle_t>::value;

} // namespace detail

} // namespace Fatras