FunctionalHelpers.h

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// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
// This software is distributed under the terms of the GNU General Public
// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
#ifndef O2_FRAMEWORK_FUNCTIONALHELPERS_H_
#define O2_FRAMEWORK_FUNCTIONALHELPERS_H_
 
#include "Framework/Pack.h"
#include <algorithm>
#include <functional>
 
namespace o2::framework
{
 
namespace
{
template <typename T>
struct memfun_type {
  using type = void;
};
} // namespace
 
template <size_t N>
struct StringLiteral {
  constexpr StringLiteral(const char (&str)[N])
  {
    std::copy_n(str, N, value);
  }
 
  char value[N];
};
 
template <typename Ret, typename Class, typename... Args>
struct memfun_type<Ret (Class::*)(Args...) const> {
  using type = std::function<Ret(Args...)>;
  using args = pack<Args...>;
  using return_type = Ret;
};
 
template <typename F>
typename memfun_type<decltype(&F::operator())>::type
  FFL(F const& func)
{
  return func;
}
 
template <typename F>
memfun_type<decltype(&F::operator())>
  FunctionMetadata(F const& func)
{
  return memfun_type<decltype(&F::operator())>();
}
 
} // namespace o2::framework
 
#endif // O2_FRAMEWORK_FUNCTIONALHELPERS_H_