DUNE-FEM (unstable)

bindguard.hh
1#ifndef DUNE_FEM_COMMON_BINDGUARD_HH
2#define DUNE_FEM_COMMON_BINDGUARD_HH
3
4#include <memory>
5#include <tuple>
6#include <utility>
7
9
10namespace Dune
11{
12
13 namespace Fem
14 {
15
16 // BindGuard
17 // ---------
18
19 template< class Object >
20 struct BindGuard
21 {
22 template< class... Args >
23 BindGuard ( Object &object, Args &&... args )
24 : object_( &object )
25 {
26 object.bind( std::forward< Args >( args )... );
27 }
28
29 private:
30 struct Deleter
31 {
32 void operator() ( Object *object ) { object->unbind(); }
33 };
34
35 std::unique_ptr< Object, Deleter > object_;
36 };
37
38
39
40 // isBindable
41 // ----------
42
43 namespace Impl
44 {
45
46 template< class Object, class... Args >
47 auto isBindable ( PriorityTag< 1 >, Object &object, Args &&... args )
48 -> decltype( std::declval< Object & >().bind( std::declval< Args >()... ), std::true_type() );
49
50 template< class Object, class... Args >
51 auto isBindable ( PriorityTag< 0 >, Object &object, Args &&... args )
52 -> std::false_type;
53
54 } // namespace Impl
55
56 template< class Object, class... Args >
57 struct isBindable
58 : public decltype( Impl::isBindable( PriorityTag< 42 >(), std::declval< Object & >(), std::declval< Args >()... ) )
59 {};
60
61
62
63 // bindGuard
64 // ---------
65
66 template< class Object, class... Args >
67 inline static auto bindGuard ( Object &object, Args &&... args )
68 -> std::enable_if_t< isBindable< Object, Args... >::value, BindGuard< Object > >
69 {
70 return BindGuard< Object >( object, std::forward< Args >( args )... );
71 }
72
73 template< std::size_t... i, class Objects, class... Args >
74 inline static auto bindGuard ( std::index_sequence< i... >, Objects objects, Args &&... args )
75 -> std::tuple< decltype( bindGuard( std::declval< std::tuple_element_t< i, Objects > >(), std::declval< Args >()... ) )... >
76 {
77 // note: do not forward args, as there the tuple might contain multiple entries
78 return std::make_tuple( bindGuard( std::get< i >( objects ), args... )... );
79 }
80
81 template< class... Object, class... Args >
82 inline static auto bindGuard ( std::tuple< Object &... > objects, Args &&... args )
83 -> decltype( bindGuard( std::index_sequence_for< Object... >(), objects, std::forward< Args >( args )... ) )
84 {
85 return bindGuard( std::index_sequence_for< Object... >(), objects, std::forward< Args >( args )... );
86 }
87
88 } // namespace Fem
89
90} // namespace Dune
91
92#endif // #ifndef DUNE_FEM_COMMON_BINDGUARD_HH
Dune namespace.
Definition: alignedallocator.hh:13
Utilities for type computations, constraining overloads, ...
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