source: trunk/yat/utility/utility.h @ 1312

Last change on this file since 1312 was 1312, checked in by Peter, 13 years ago

closes ticket:360 a template function to check if a string is of type
T is_int, is_float, and is_double use this template, which implies a
change. For instance, is_int("inf") will only return true if
numerical_limits<int>::has_infinity is true. This was not the case
before. Similar for "-inf" and "NaN", and alos for is_float. For
is_double this should not be an issue because double is required to
support both inf and NaN (checked in configure).

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 3.6 KB
Line 
1#ifndef _theplu_yat_utility_utility_
2#define _theplu_yat_utility_utility_
3
4// $Id: utility.h 1312 2008-05-19 16:30:52Z peter $
5
6/*
7  Copyright (C) 2005 Jari Häkkinen, Peter Johansson, Markus Ringnér
8  Copyright (C) 2006 Jari Häkkinen
9  Copyright (C) 2007 Jari Häkkinen, Peter Johansson
10  Copyright (C) 2008 Peter Johansson
11
12  This file is part of the yat library, http://trac.thep.lu.se/yat
13
14  The yat library is free software; you can redistribute it and/or
15  modify it under the terms of the GNU General Public License as
16  published by the Free Software Foundation; either version 2 of the
17  License, or (at your option) any later version.
18
19  The yat library is distributed in the hope that it will be useful,
20  but WITHOUT ANY WARRANTY; without even the implied warranty of
21  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22  General Public License for more details.
23
24  You should have received a copy of the GNU General Public License
25  along with this program; if not, write to the Free Software
26  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
27  02111-1307, USA.
28*/
29
30///
31/// @file utility/utility.h
32///
33/// @brief Some useful functions are placed here
34///
35
36#include <string>
37#include <stdexcept>
38#include <sstream>
39#include <utility>
40#include <vector>
41
42namespace theplu {
43namespace yat {
44namespace utility {
45
46  class Matrix;
47
48  /**
49     \brief convert string to (numerical) type
50
51     \throw runtime_error if conversion fails
52   */
53  template<typename T>
54  T convert(const std::string& s);
55
56  /**
57     \brief check if string is convertible to (numerical) type
58   */
59  template<typename T>
60  bool is(const std::string& s);
61
62  ///
63  /// @return true if string is a double
64  ///
65  /// \deprecated use is<double>(const std::string&)
66  ///
67  bool is_double(const std::string&);
68
69  /**
70     @return true if string \a s fulfills regular expression \verbatim
71     ^\w* \endverbatim \a other \verbatim \w*$ \endverbatim (case
72     insensitive)
73  */
74  bool is_equal(std::string s, std::string other);
75
76  ///
77  /// @return true if string is a float
78  ///
79  /// \deprecated use is<float>(const std::string&)
80  ///
81  bool is_float(const std::string&);
82
83  ///
84  /// @return true if string is an int
85  ///
86  /// \deprecated use is<int>(const std::string&)
87  ///
88  bool is_int(const std::string&);
89
90  ///
91  /// @return true if string is "nan" (case-insensitive)
92  ///
93  bool is_nan(const std::string& s);
94
95  /**
96     \brief Perform quantile normalization
97   */
98  void quantile_normalize(Matrix&);
99
100  // template implementations
101  template<typename T>
102  T convert(const std::string& s)
103  {
104    if (is_nan(s))
105      return std::numeric_limits<T>::quiet_NaN();
106    if (is_equal(s, "inf"))
107      return std::numeric_limits<T>::infinity();
108    if (is_equal(s, "-inf"))
109      if (std::numeric_limits<T>::is_signed)
110        return -std::numeric_limits<T>::infinity();
111      else
112        throw std::runtime_error(std::string("convert(\"")+s+
113                                 std::string("\"): type is unsigned") );
114    std::stringstream ss(s);
115    T a;
116    ss >> a;
117    bool ok = true;
118    if(ss.fail()) 
119      ok = false;
120    // Check that nothing is left on stream
121    std::string b;
122    ss >> b;
123    if (!b.empty() || !ok)
124      throw std::runtime_error(std::string("convert(\"")+s+std::string("\")"));
125    return a;
126  }
127
128  template<typename T>
129  bool is(const std::string& s)
130  {
131    if (is_nan(s))
132      return std::numeric_limits<T>::has_quiet_NaN;
133    if (is_equal(s, "inf"))
134      return std::numeric_limits<T>::has_infinity;
135    if (is_equal(s, "-inf"))
136      return std::numeric_limits<T>::has_infinity && 
137        std::numeric_limits<T>::is_signed;
138    std::stringstream ss(s);
139    T a;
140    ss >> a;
141    if(ss.fail())
142      return false;
143    // Check that nothing is left on stream
144    std::string b;
145    ss >> b;
146    return b.empty();
147  }
148
149}}} // of namespace utility, yat, and theplu
150
151#endif
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