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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 <lunchbox/future.h> // base class
22 #include <boost/function/function0.hpp>
23 
24 namespace lunchbox
25 {
30 template< class T > class FutureFunction : public FutureImpl< T >
31 {
32 public:
33  typedef boost::function< T() > Func;
34 
35  explicit FutureFunction( const Func& func ) : func_( func ) {}
36 
37 protected:
38  virtual ~FutureFunction() { wait( 0 ); }
39 
40  T wait( const uint32_t ) final
41  {
42  if( !func_.empty( ))
43  {
44  result_ = func_();
45  func_.clear();
46  }
47  return result_;
48  }
49 
50  bool isReady() const final { return func_.empty(); }
51 
52  Func func_;
53  T result_;
54 };
55 
56 }
57 #endif //LUNCHBOX_FUTURE_H
A Future implementation using a boost::function for fulfilment.
boost::function< T() > Func
The fulfilling function.
T wait(const uint32_t) final
Wait for the promise to be fullfilled.
bool isReady() const final
Base class to implement the wait method fulfilling the future.
Definition: future.h:37