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tools.hh
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1 /* -*- mia-c++ -*-
2  *
3  * This file is part of MIA - a toolbox for medical image analysis
4  * Copyright (c) Leipzig, Madrid 1999-2017 Gert Wollny
5  *
6  * MIA is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 3 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with MIA; if not, see <http://www.gnu.org/licenses/>.
18  *
19  */
20 
21 #ifndef mia_core_tools_hh
22 #define mia_core_tools_hh
23 
24 #include <sstream>
25 #include <string>
26 #include <boost/call_traits.hpp>
27 #include <memory>
28 #include <cmath>
29 #include <mia/core/defines.hh>
30 #include <mia/core/errormacro.hh>
31 
33 
41 template <typename T>
43  virtual void operator () (T *)
44  {
45  }
46 };
47 
48 
58 template <typename Data>
60 {
61 public:
62  typedef std::shared_ptr<Data> PData;
63  PData operator () (Data& d) const
64  {
65  return PData(&d, void_destructor<Data>());
66  }
67 };
68 
69 
80 template <typename T>
81 bool from_string(const char *s, T& result)
82 {
83  std::istringstream sx(s);
84  sx >> result;
85 
86  if (sx.fail())
87  return false;
88 
89  if (sx.eof())
90  return true;
91 
92  std::string remaining;
93  sx >> remaining;
94  bool retval = true;
95 
96  for (auto i = remaining.begin(); i != remaining.end(); ++i)
97  retval &= isspace(remaining[0]);
98 
99  return retval;
100 }
101 
112 template <typename T>
113 bool from_string(const std::string& s, T& result)
114 {
115  return from_string(s.c_str(), result);
116 }
117 
118 
127 template <typename T>
128 const std::string to_string(typename boost::call_traits<T>::param_type v)
129 {
130  std::stringstream result;
131  result << v;
132  return result.str();
133 }
134 
135 
136 /*
137  The special handling of floating point values is needed,
138  because c++ writes out inf/-inf for infinity, but XML
139  expects uppercase INF/-INF.
140 */
141 template <typename T>
142 const std::string to_string_fp(T v)
143 {
144  std::stringstream result;
145  int inf = std::isinf(v);
146 
147  if (!inf) {
148  result << v;
149  } else {
150  if (inf < 0)
151  result << "-";
152 
153  result << "INF";
154  }
155 
156  return result.str();
157 }
158 
159 template <>
160 inline const std::string to_string<float>(boost::call_traits<float>::param_type v)
161 {
162  return to_string_fp(v);
163 }
164 
165 template <>
166 inline const std::string to_string<double>(boost::call_traits<double>::param_type v)
167 {
168  return to_string_fp(v);
169 }
170 
171 
173 
174 #endif
to_string_fp
const std::string to_string_fp(T v)
Definition: tools.hh:142
from_string
bool from_string(const char *s, T &result)
Definition: tools.hh:81
to_string
const std::string to_string(typename boost::call_traits< T >::param_type v)
Definition: tools.hh:128
NS_MIA_BEGIN
#define NS_MIA_BEGIN
conveniance define to start the mia namespace
Definition: defines.hh:33
FWrapStaticDataInSharedPointer
functor to wrap statically allocated data a shared pointer representation
Definition: tools.hh:60
to_string< float >
const std::string to_string< float >(boost::call_traits< float >::param_type v)
Definition: tools.hh:160
void_destructor::operator()
virtual void operator()(T *)
Definition: tools.hh:43
NS_MIA_END
#define NS_MIA_END
conveniance define to end the mia namespace
Definition: defines.hh:36
FWrapStaticDataInSharedPointer::PData
std::shared_ptr< Data > PData
Definition: tools.hh:62
errormacro.hh
FWrapStaticDataInSharedPointer::operator()
PData operator()(Data &d) const
Definition: tools.hh:63
defines.hh
void_destructor
A helper class to make it possible to store a non-pointer object or a pointer that must not be freed ...
Definition: tools.hh:42
to_string< double >
const std::string to_string< double >(boost::call_traits< double >::param_type v)
Definition: tools.hh:166