1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
/**
* @file stringize.h
* @author Nat Goodspeed
* @date 2008-12-17
* @brief stringize(item) template function and STRINGIZE(expression) macro
*
* $LicenseInfo:firstyear=2008&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#if ! defined(LL_STRINGIZE_H)
#define LL_STRINGIZE_H
#include <sstream>
#include <llstring.h>
/**
* gstringize(item) encapsulates an idiom we use constantly, using
* operator<<(std::ostringstream&, TYPE) followed by std::ostringstream::str()
* or their wstring equivalents
* to render a string expressing some item.
*/
template <typename CHARTYPE, typename T>
std::basic_string<CHARTYPE> gstringize(const T& item)
{
std::basic_ostringstream<CHARTYPE> out;
out << item;
return out.str();
}
/**
*partial specialization of stringize for handling wstring
*TODO: we should have similar specializations for wchar_t[] but not until it is needed.
*/
inline std::string stringize(const std::wstring& item)
{
return wstring_to_utf8str(item);
}
/**
* Specialization of gstringize for std::string return types
*/
template <typename T>
std::string stringize(const T& item)
{
return gstringize<char>(item);
}
/**
* Specialization for generating wstring from string.
* Both a convenience function and saves a miniscule amount of overhead.
*/
inline std::wstring wstringize(const std::string& item)
{
// utf8str_to_wstring() returns LLWString, which isn't necessarily the
// same as std::wstring
LLWString s(utf8str_to_wstring(item));
return std::wstring(s.begin(), s.end());
}
/**
* Specialization of gstringize for std::wstring return types
*/
template <typename T>
std::wstring wstringize(const T& item)
{
return gstringize<wchar_t>(item);
}
/**
* stringize_f(functor)
*/
template <typename CHARTYPE, typename Functor>
std::basic_string<CHARTYPE> stringize_f(Functor const & f)
{
std::basic_ostringstream<CHARTYPE> out;
f(out);
return out.str();
}
/**
* STRINGIZE(item1 << item2 << item3 ...) effectively expands to the
* following:
* @code
* std::ostringstream out;
* out << item1 << item2 << item3 ... ;
* return out.str();
* @endcode
*/
#define STRINGIZE(EXPRESSION) (stringize_f<char>([&](std::ostream& out){ out << EXPRESSION; }))
/**
* WSTRINGIZE() is the wstring equivalent of STRINGIZE()
*/
#define WSTRINGIZE(EXPRESSION) (stringize_f<wchar_t>([&](std::wostream& out){ out << EXPRESSION; }))
/**
* destringize(str)
* defined for symmetry with stringize
* @NOTE - this has distinct behavior from boost::lexical_cast<T> regarding
* leading/trailing whitespace and handling of bad_lexical_cast exceptions
* @NOTE - no need for dewstringize(), since passing std::wstring will Do The
* Right Thing
*/
template <typename T, typename CHARTYPE>
T destringize(std::basic_string<CHARTYPE> const & str)
{
T val;
std::basic_istringstream<CHARTYPE> in(str);
in >> val;
return val;
}
/**
* destringize_f(str, functor)
*/
template <typename CHARTYPE, typename Functor>
void destringize_f(std::basic_string<CHARTYPE> const & str, Functor const & f)
{
std::basic_istringstream<CHARTYPE> in(str);
f(in);
}
/**
* DESTRINGIZE(str, item1 >> item2 >> item3 ...) effectively expands to the
* following:
* @code
* std::istringstream in(str);
* in >> item1 >> item2 >> item3 ... ;
* @endcode
* @NOTE - once we get generic lambdas, we shouldn't need DEWSTRINGIZE() any
* more since DESTRINGIZE() should do the right thing with a std::wstring. But
* until then, the lambda we pass must accept the right std::basic_istream.
*/
#define DESTRINGIZE(STR, EXPRESSION) (destringize_f((STR), [&](std::istream& in){in >> EXPRESSION;}))
#define DEWSTRINGIZE(STR, EXPRESSION) (destringize_f((STR), [&](std::wistream& in){in >> EXPRESSION;}))
#endif /* ! defined(LL_STRINGIZE_H) */
|
