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author | fluxgen <fluxgen> | 2003-08-24 10:37:31 (GMT) |
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committer | fluxgen <fluxgen> | 2003-08-24 10:37:31 (GMT) |
commit | 52f7ee11f7d4fc3c9fe81f95e4176b73140575c3 (patch) | |
tree | 0e7af85f45a0e28e63cfc1f48f39ce0131eaa1e6 /src/FbTk | |
parent | c70ffc4e6499fc17dbc3d359afdcda85588a8b1e (diff) | |
download | fluxbox-52f7ee11f7d4fc3c9fe81f95e4176b73140575c3.zip fluxbox-52f7ee11f7d4fc3c9fe81f95e4176b73140575c3.tar.bz2 |
composes two functions into one
Diffstat (limited to 'src/FbTk')
-rw-r--r-- | src/FbTk/Compose.hh | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/src/FbTk/Compose.hh b/src/FbTk/Compose.hh new file mode 100644 index 0000000..697023c --- /dev/null +++ b/src/FbTk/Compose.hh | |||
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1 | // Composer.hh | ||
2 | // Copyright (c) 2003 Henrik Kinnunen (fluxgen at users.sourceforge.net) | ||
3 | // | ||
4 | // Permission is hereby granted, free of charge, to any person obtaining a | ||
5 | // copy of this software and associated documentation files (the "Software"), | ||
6 | // to deal in the Software without restriction, including without limitation | ||
7 | // the rights to use, copy, modify, merge, publish, distribute, sublicense, | ||
8 | // and/or sell copies of the Software, and to permit persons to whom the | ||
9 | // Software is furnished to do so, subject to the following conditions: | ||
10 | // | ||
11 | // The above copyright notice and this permission notice shall be included in | ||
12 | // all copies or substantial portions of the Software. | ||
13 | // | ||
14 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
15 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
16 | // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | ||
17 | // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
18 | // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | ||
19 | // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | ||
20 | // DEALINGS IN THE SOFTWARE. | ||
21 | |||
22 | // $Id: Compose.hh,v 1.1 2003/08/24 10:37:31 fluxgen Exp $ | ||
23 | |||
24 | #ifndef FBTK_COMPOSE_HH | ||
25 | #define FBTK_COMPOSE_HH | ||
26 | |||
27 | #include <functional> | ||
28 | |||
29 | namespace FbTk { | ||
30 | |||
31 | /// Composes two functions into one. | ||
32 | /// Uses Arg for type B and then calls type A | ||
33 | template <class A, class B> | ||
34 | class Compose_base: public std::unary_function<typename B::argument_type, typename A::result_type> { | ||
35 | public: | ||
36 | typedef typename A::result_type ResultTypeA; | ||
37 | typedef typename A::argument_type ArgumentTypeA; | ||
38 | typedef typename B::result_type ResultTypeB; | ||
39 | typedef typename B::argument_type ArgumentTypeB; | ||
40 | |||
41 | Compose_base(const A &a, const B &b):m_a(a), m_b(b) { } | ||
42 | ResultTypeA operator () (const ArgumentTypeB &arg) const { | ||
43 | return m_a(m_b(arg)); | ||
44 | } | ||
45 | |||
46 | private: | ||
47 | A m_a; | ||
48 | B m_b; | ||
49 | }; | ||
50 | |||
51 | // helper that creates a Compose_base | ||
52 | template <typename A, typename B> | ||
53 | inline Compose_base<A, B> | ||
54 | Compose(const A& a, const B& b) { | ||
55 | return Compose_base<A, B>(a, b); | ||
56 | } | ||
57 | |||
58 | }; // namespace FbTk | ||
59 | |||
60 | #endif // FBTK_COMPOSE_HH | ||