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kvl_regression.cc
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31  /* */
32  /* Author: Richard Caley (rjc@cstr.ed.ac.uk) */
33  /* Date: Tue Jul 22 1997 */
34  /* --------------------------------------------------------------------- */
35  /* Example of list class use. */
36  /* */
37  /*************************************************************************/
38 
39 #include <cstdlib>
40 #include <iostream>
41 #include "EST_TKVL.h"
42 #include "EST_Option.h"
43 #include "EST_util_class.h"
44 #include "EST_types.h"
45 
46 /**@name key_value_example
47  *
48  * some stuff about lists
49  *
50  * @see EST_KVL
51  * @see EST_KVI
52  * @see EST_Option
53  */
54 //@{
55 
56 
57 int main(void)
58 {
59  EST_StrStr_KVL kvl; // decl
60 
61  /**@name Addition
62  */
63  //@{
64 
65  // add item simply appends key value pairs onto the end of the list.
66  // This function is useful for the initial building of a list.
67  kvl.add_item("street", "South Bbridge");
68  kvl.add_item("city", "Edinburgh");
69  kvl.add_item("post code", "EH1 1HN");
70  kvl.add_item("country", "United Kingdom");
71 
72  // by default, if a new entry has the same key name as an existing key,
73  // it will not overwrite this, leaving 2 items with the same key.
74  // The first will be the one accessed.
75  // You can overwrite existing keys by adding a flag to this function.
76  // Note that this is much slower as all the existing keys must
77  // be checked.
78  kvl.add_item("country", "Scotland", 1);
79 
80  // This is equivalent to the change_item function, which is
81  // used to overwrite existing entries:
82 
83  kvl.add_item("country", "Caledonia", 1);
84 
85  // Items are accessed by the val function, indexed by the key:
86  // This prints the value associated with the key "country".
87  cout << kvl.val("country") << endl;
88 
89  // An error is given if the key doesn't exist:
90  cout << kvl.val("state") << endl;
91 
92  // This can be turned off by use of a flag. In this case the default
93  // value is returned.
94 
95  cout << kvl.val("state", 0) << endl;
96 
97  // A on-the fly default value can be specified by putting using the
98  // val_def function:
99 
100  cout << kvl.val_def("state", "unknown") << endl;
101 
102  // present() returns true of the key exists:
103  if (kvl.present("state"))
104  cout << kvl.val("state") << endl;
105 
106  //@}
107 
108 }
109