1 // Copyright (c) 2010, Thomas Goyne <plorkyeran@aegisub.org>
2 //
3 // Permission to use, copy, modify, and distribute this software for any
4 // purpose with or without fee is hereby granted, provided that the above
5 // copyright notice and this permission notice appear in all copies.
6 //
7 // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
8 // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
9 // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
10 // ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
11 // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
12 // ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
13 // OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
14 
15 /// @file scoped_ptr.h
16 /// @brief
17 /// @ingroup libaegisub
18 
19 #pragma once
20 
21 namespace agi {
22 /// A generic scoped holder for non-pointer handles
23 template<class T, class Del = void(*)(T)>
24 class scoped_holder {
25 	T value;
26 	Del destructor;
27 
28 	scoped_holder(scoped_holder const&);
29 	scoped_holder& operator=(scoped_holder const&);
30 public:
T()31 	operator T() const { return value; }
32 	T operator->() const { return value; }
33 
34 	scoped_holder& operator=(T new_value) {
35 		if (value)
36 			destructor(value);
37 		value = new_value;
38 		return *this;
39 	}
40 
scoped_holder(T value,Del destructor)41 	scoped_holder(T value, Del destructor)
42 	: value(value)
43 	, destructor(destructor)
44 	{
45 	}
46 
~scoped_holder()47 	~scoped_holder() { if (value) destructor(value); }
48 };
49 }
50