.:F L U X B O X:. - Developer Zone

00001 // Composer.hh
00002 // Copyright (c) 2003 Henrik Kinnunen (fluxgen at users.sourceforge.net)
00003 //
00004 // Permission is hereby granted, free of charge, to any person obtaining a
00005 // copy of this software and associated documentation files (the "Software"),
00006 // to deal in the Software without restriction, including without limitation
00007 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
00008 // and/or sell copies of the Software, and to permit persons to whom the
00009 // Software is furnished to do so, subject to the following conditions:
00010 //
00011 // The above copyright notice and this permission notice shall be included in
00012 // all copies or substantial portions of the Software.
00013 //
00014 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00015 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00016 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
00017 // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00018 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
00019 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
00020 // DEALINGS IN THE SOFTWARE.
00021 
00022 // $Id: Compose.hh,v 1.2 2003/12/16 17:06:49 fluxgen Exp $
00023 
00024 #ifndef FBTK_COMPOSE_HH
00025 #define FBTK_COMPOSE_HH
00026 
00027 #include <functional>
00028 
00029 namespace FbTk {
00030 
00033 template <class A, class B>
00034 class Compose_base: public std::unary_function<typename B::argument_type, typename A::result_type> {
00035 public:
00036     typedef typename A::result_type ResultTypeA;
00037     typedef typename A::argument_type ArgumentTypeA;
00038     typedef typename B::result_type ResultTypeB;
00039     typedef typename B::argument_type ArgumentTypeB;
00040 
00041     Compose_base(const A &a, const B &b):m_a(a), m_b(b) { }
00042     ResultTypeA operator () (const ArgumentTypeB &arg) const {
00043         return m_a(m_b(arg));
00044     }
00045 
00046 private:
00047     A m_a;
00048     B m_b;
00049 };
00050 
00051 // helper that creates a Compose_base
00052 template <typename A, typename B>
00053 inline Compose_base<A, B> 
00054 Compose(const A& a, const B& b) {
00055     return Compose_base<A, B>(a, b);
00056 }
00057 
00058 } // namespace FbTk
00059 
00060 #endif // FBTK_COMPOSE_HH
Compose.hh

Fluxbox CVS-Jan-2003
