IsDetected.h

/**************************************************************************
 * BASF2 (Belle Analysis Framework 2)                                     *
 * Copyright(C) 2017 - Belle II Collaboration                             *
 *                                                                        *
 * Author: The Belle II Collaboration                                     *
 * Contributors: Oliver Frost                                             *
 *                                                                        *
 * This software is provided "as is" without any warranty.                *
 **************************************************************************/
#pragma once
 
#include <type_traits>
 
namespace Belle2 {
  namespace TrackFindingCDC {
 
    template<typename... Ts>
    using ToVoid = void;
 
    template<typename, template<typename...> class, typename...>
    struct DetectPropertyImpl : std::false_type {};
 
    template<template<class...> class AToPredicate, typename... Ts>
    struct DetectPropertyImpl<ToVoid<AToPredicate<Ts...>>, AToPredicate, Ts...> : std::true_type {};
 
    template<template<class...> class AToPredicate, typename... Ts>
    constexpr bool isDetected()
    {
      return DetectPropertyImpl<ToVoid<>, AToPredicate, Ts...>::value;
    }
  }
}