trace.h

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/*
 *  This file is a part of TiledArray.
 *  Copyright (C) 2015  Virginia Tech
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *  Justus Calvin
 *  Department of Chemistry, Virginia Tech
 *
 *  kernels.h
 *  Jun 1, 2015
 *
 */
 
#ifndef TILEDARRAY_TRACE_H__INCLUDED
#define TILEDARRAY_TRACE_H__INCLUDED
 
#include <type_traits> // enable_if, true_type, false_type
 
namespace TiledArray {
namespace detail {
 
template <typename T, typename Enabler = void>
struct TraceIsDefined : std::false_type {};
 
template <typename T>
constexpr auto trace_is_defined_v = TraceIsDefined<T>::value;
 
template <typename T, typename U = void>
using enable_if_trace_is_defined_t = std::enable_if_t<trace_is_defined_v<T>, U>;
 
template <typename TileType, typename Enabler = void>
struct Trace;
 
} // namespace detail
 
template<typename T, typename = detail::enable_if_trace_is_defined_t<T>>
decltype(auto) trace(const T& t){
  detail::Trace<T> tracer;
  return tracer(t);
}
 
template<typename T>
using result_of_trace_t = decltype(trace(std::declval<T>()));
 
} // namespace TiledArray
#endif // TILEDARRAY_TRACE_H__INCLUDED