/[svn]/linuxsampler/trunk/src/common/optional.h
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Contents of /linuxsampler/trunk/src/common/optional.h

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Revision 123 - (show annotations) (download) (as text)
Mon Jun 14 19:33:16 2004 UTC (19 years, 10 months ago) by schoenebeck
File MIME type: text/x-c++hdr
File size: 4087 byte(s) 
* src/common: added template class 'optional<>' which can be used e.g. as
  return type whenever a value might be returned, but don't has to; this
  template class pretty much acts like a pointer of the given type, but is
  much more safer than a simple pointer
* src/audiodriver: added static class AudioDeviceFactory to create audio
  devices at runtime by using a string and to obtain driver informations
  of drivers at runtime, driver classes should simply use the macro
  REGISTER_AUDIO_OUTPUT_DRIVER(DriverName,DriverClass) in their cpp file
  to register the driver to LinuxSampler (no changes needed anymore in the
  LS code to add a new audio output driver)
* src/drivers: added classes to dynamically manage driver parameters; there
  are two different kinds of parameters: parameters which are need to
  create a new device (DeviceCreationParameterX) used to e.g. create an
  audio output device or a MIDI input device and parameters which are only
  available at runtime, means when a device is already created
  (DeviceRuntimeParameterX) which will be e.g. used as audio channel
  parameters and MIDI port parameters
* src/linuxsampler.cpp: all registered audio output drivers will be shown
  on the console on startup
* src/network: implemented configuration of audio output devices via LSCP
1 /***************************************************************************
2 * *
3 * LinuxSampler - modular, streaming capable sampler *
4 * *
5 * Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6 * *
7 * This program is free software; you can redistribute it and/or modify *
8 * it under the terms of the GNU General Public License as published by *
9 * the Free Software Foundation; either version 2 of the License, or *
10 * (at your option) any later version. *
11 * *
12 * This program is distributed in the hope that it will be useful, *
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
15 * GNU General Public License for more details. *
16 * *
17 * You should have received a copy of the GNU General Public License *
18 * along with this program; if not, write to the Free Software *
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
20 * MA 02111-1307 USA *
21 ***************************************************************************/
22
23 #ifndef __LS_OPTIONAL_H__
24 #define __LS_OPTIONAL_H__
25
26 #include "LinuxSamplerException.h"
27
28 namespace LinuxSampler {
29
30 class optional_base {
31 public:
32 class nothing_t { public: nothing_t() {} };
33
34 static const nothing_t nothing;
35 };
36
37 template<class T>
38 class optional : public optional_base {
39 public:
40 optional() {
41 initialized = false;
42 }
43
44 optional(T data) {
45 this->data = data;
46 initialized = true;
47 }
48
49 optional(nothing_t) {
50 initialized = false;
51 }
52
53 template <class T_inner>
54 optional(T_inner data) {
55 this->data = T(data);
56 initialized = true;
57 }
58
59 const T& get() const throw (LinuxSamplerException) {
60 if (!initialized) throw LinuxSamplerException("optional variable not initialized");
61 return data;
62 }
63
64 T& get() throw (LinuxSamplerException) {
65 if (!initialized) throw LinuxSamplerException("optional variable not initialized");
66 return data;
67 }
68
69 optional& operator =(const optional& arg) throw (LinuxSamplerException) {
70 if (!arg.initialized) LinuxSamplerException("optional variable not initialized");
71 this->data = arg.data;
72 initialized = true;
73 }
74
75 optional& operator =(const T& arg) {
76 this->data = arg;
77 initialized = true;
78 }
79
80 const T& operator *() const throw (LinuxSamplerException) { return get(); }
81 T& operator *() throw (LinuxSamplerException) { return get(); }
82
83 const T* operator ->() const throw (LinuxSamplerException) {
84 if (!initialized) throw LinuxSamplerException("optional variable not initialized");
85 return &data;
86 }
87
88 T* operator ->() throw (LinuxSamplerException) {
89 if (!initialized) throw LinuxSamplerException("optional variable not initialized");
90 return &data;
91 }
92
93 operator bool() const { return initialized; }
94 bool operator !() const { return initialized; }
95
96 protected:
97 T data;
98 bool initialized;
99 };
100
101 } // namespace LinuxSampler
102
103 #endif // __LS_OPTIONAL_H__
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