Lunchbox  1.17.0
Multi-threaded C++ toolbox library for all application developers creating high-performance multi-threaded programs.
futureFunction.h
1 
2 /* Copyright (c) 2013-2014, Stefan.Eilemann@epfl.ch
3  *
4  * This library is free software; you can redistribute it and/or modify it under
5  * the terms of the GNU Lesser General Public License version 2.1 as published
6  * by the Free Software Foundation.
7  *
8  * This library is distributed in the hope that it will be useful, but WITHOUT
9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
10  * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
11  * details.
12  *
13  * You should have received a copy of the GNU Lesser General Public License
14  * along with this library; if not, write to the Free Software Foundation, Inc.,
15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16  */
17 
18 #ifndef LUNCHBOX_FUTUREFUNCTION_H
19 #define LUNCHBOX_FUTUREFUNCTION_H
20 
21 #include <boost/function/function0.hpp>
22 #include <lunchbox/future.h> // base class
23 
24 namespace lunchbox
25 {
30 template <class T>
31 class FutureFunction : public FutureImpl<T>
32 {
33 public:
34  typedef boost::function<T()> Func;
35 
36  explicit FutureFunction(const Func& func)
37  : func_(func)
38  {
39  }
40 
41 protected:
42  virtual ~FutureFunction() { wait(0); }
43  T wait(const uint32_t) final
44  {
45  if (!func_.empty())
46  {
47  result_ = func_();
48  func_.clear();
49  }
50  return result_;
51  }
52 
53  bool isReady() const final { return func_.empty(); }
54  Func func_;
55  T result_;
56 };
57 }
58 #endif // LUNCHBOX_FUTURE_H
A Future implementation using a boost::function for fulfilment.
T wait(const uint32_t) final
Wait for the promise to be fullfilled.
Base class to implement the wait method fulfilling the future.
Definition: future.h:39
Abstraction layer and common utilities for multi-threaded programming.
Definition: algorithm.h:29
boost::function< T()> Func
The fulfilling function.
bool isReady() const final