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/*
* Copyright 2014 Daniel Vrátil <dvratil@redhat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This library 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 Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef ASYNC_IMPL_H
#define ASYNC_IMPL_H
#include "async.h"
#include <type_traits>
namespace Async {
namespace detail {
template<typename T>
struct identity
{
typedef T type;
};
template<typename T, typename Enable = void>
struct isIterable {
enum { value = 0 };
};
template<typename T>
struct isIterable<T, typename std::conditional<false, typename T::iterator, void>::type> {
enum { value = 1 };
};
template<typename ... T>
struct prevOut {
using type = typename std::tuple_element<0, std::tuple<T ..., void>>::type;
};
template<typename T>
inline typename std::enable_if<!std::is_void<T>::value, void>::type
copyFutureValue(const Async::Future<T> &in, Async::Future<T> &out)
{
out.setValue(in.value());
}
template<typename T>
inline typename std::enable_if<std::is_void<T>::value, void>::type
copyFutureValue(const Async::Future<T> &in, Async::Future<T> &out)
{
// noop
}
template<typename T>
inline typename std::enable_if<!std::is_void<T>::value, void>::type
aggregateFutureValue(const Async::Future<T> &in, Async::Future<T> &out)
{
out.setValue(out.value() + in.value());
}
template<typename T>
inline typename std::enable_if<std::is_void<T>::value, void>::type
aggregateFutureValue(const Async::Future<T> &in, Async::Future<T> &out)
{
// noop
}
} // namespace Detail
} // namespace Async
#endif // ASYNC_IMPL_H
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