Enchant Generic spell checking library

c++defs.h
1 /* C++ compatible function declaration macros.
2 Copyright (C) 2010-2017 Free Software Foundation, Inc.
3
4 This program is free software: you can redistribute it and/or modify it
5 under the terms of the GNU General Public License as published
6 by the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
16
17 #ifndef _GL_CXXDEFS_H
18 #define _GL_CXXDEFS_H
19
20 /* Begin/end the GNULIB_NAMESPACE namespace. */
21 #if defined __cplusplus && defined GNULIB_NAMESPACE
22 # define _GL_BEGIN_NAMESPACE namespace GNULIB_NAMESPACE {
23 # define _GL_END_NAMESPACE }
24 #else
25 # define _GL_BEGIN_NAMESPACE
26 # define _GL_END_NAMESPACE
27 #endif
28
29 /* The three most frequent use cases of these macros are:
30
31 * For providing a substitute for a function that is missing on some
32 platforms, but is declared and works fine on the platforms on which
33 it exists:
34
35 #if @GNULIB_FOO@
36 # if !@HAVE_FOO@
37 _GL_FUNCDECL_SYS (foo, ...);
38 # endif
39 _GL_CXXALIAS_SYS (foo, ...);
40 _GL_CXXALIASWARN (foo);
41 #elif defined GNULIB_POSIXCHECK
42 ...
43 #endif
44
45 * For providing a replacement for a function that exists on all platforms,
46 but is broken/insufficient and needs to be replaced on some platforms:
47
48 #if @GNULIB_FOO@
49 # if @REPLACE_FOO@
50 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
51 # undef foo
52 # define foo rpl_foo
53 # endif
54 _GL_FUNCDECL_RPL (foo, ...);
55 _GL_CXXALIAS_RPL (foo, ...);
56 # else
57 _GL_CXXALIAS_SYS (foo, ...);
58 # endif
59 _GL_CXXALIASWARN (foo);
60 #elif defined GNULIB_POSIXCHECK
61 ...
62 #endif
63
64 * For providing a replacement for a function that exists on some platforms
65 but is broken/insufficient and needs to be replaced on some of them and
66 is additionally either missing or undeclared on some other platforms:
67
68 #if @GNULIB_FOO@
69 # if @REPLACE_FOO@
70 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
71 # undef foo
72 # define foo rpl_foo
73 # endif
74 _GL_FUNCDECL_RPL (foo, ...);
75 _GL_CXXALIAS_RPL (foo, ...);
76 # else
77 # if !@HAVE_FOO@ or if !@HAVE_DECL_FOO@
78 _GL_FUNCDECL_SYS (foo, ...);
79 # endif
80 _GL_CXXALIAS_SYS (foo, ...);
81 # endif
82 _GL_CXXALIASWARN (foo);
83 #elif defined GNULIB_POSIXCHECK
84 ...
85 #endif
86 */
87
88 /* _GL_EXTERN_C declaration;
89 performs the declaration with C linkage. */
90 #if defined __cplusplus
91 # define _GL_EXTERN_C extern "C"
92 #else
93 # define _GL_EXTERN_C extern
94 #endif
95
96 /* _GL_FUNCDECL_RPL (func, rettype, parameters_and_attributes);
97 declares a replacement function, named rpl_func, with the given prototype,
98 consisting of return type, parameters, and attributes.
99 Example:
100 _GL_FUNCDECL_RPL (open, int, (const char *filename, int flags, ...)
101 _GL_ARG_NONNULL ((1)));
102 */
103 #define _GL_FUNCDECL_RPL(func,rettype,parameters_and_attributes) \
104 _GL_FUNCDECL_RPL_1 (rpl_##func, rettype, parameters_and_attributes)
105 #define _GL_FUNCDECL_RPL_1(rpl_func,rettype,parameters_and_attributes) \
106 _GL_EXTERN_C rettype rpl_func parameters_and_attributes
107
108 /* _GL_FUNCDECL_SYS (func, rettype, parameters_and_attributes);
109 declares the system function, named func, with the given prototype,
110 consisting of return type, parameters, and attributes.
111 Example:
112 _GL_FUNCDECL_SYS (open, int, (const char *filename, int flags, ...)
113 _GL_ARG_NONNULL ((1)));
114 */
115 #define _GL_FUNCDECL_SYS(func,rettype,parameters_and_attributes) \
116 _GL_EXTERN_C rettype func parameters_and_attributes
117
118 /* _GL_CXXALIAS_RPL (func, rettype, parameters);
119 declares a C++ alias called GNULIB_NAMESPACE::func
120 that redirects to rpl_func, if GNULIB_NAMESPACE is defined.
121 Example:
122 _GL_CXXALIAS_RPL (open, int, (const char *filename, int flags, ...));
123
124 Wrapping rpl_func in an object with an inline conversion operator
125 avoids a reference to rpl_func unless GNULIB_NAMESPACE::func is
126 actually used in the program. */
127 #define _GL_CXXALIAS_RPL(func,rettype,parameters) \
128 _GL_CXXALIAS_RPL_1 (func, rpl_##func, rettype, parameters)
129 #if defined __cplusplus && defined GNULIB_NAMESPACE
130 # define _GL_CXXALIAS_RPL_1(func,rpl_func,rettype,parameters) \
131 namespace GNULIB_NAMESPACE \
132 { \
133 static const struct _gl_ ## func ## _wrapper \
134 { \
135 typedef rettype (*type) parameters; \
136 \
137 inline operator type () const \
138 { \
139 return ::rpl_func; \
140 } \
141 } func = {}; \
142 } \
143 _GL_EXTERN_C int _gl_cxxalias_dummy
144 #else
145 # define _GL_CXXALIAS_RPL_1(func,rpl_func,rettype,parameters) \
146 _GL_EXTERN_C int _gl_cxxalias_dummy
147 #endif
148
149 /* _GL_CXXALIAS_RPL_CAST_1 (func, rpl_func, rettype, parameters);
150 is like _GL_CXXALIAS_RPL_1 (func, rpl_func, rettype, parameters);
151 except that the C function rpl_func may have a slightly different
152 declaration. A cast is used to silence the "invalid conversion" error
153 that would otherwise occur. */
154 #if defined __cplusplus && defined GNULIB_NAMESPACE
155 # define _GL_CXXALIAS_RPL_CAST_1(func,rpl_func,rettype,parameters) \
156 namespace GNULIB_NAMESPACE \
157 { \
158 static const struct _gl_ ## func ## _wrapper \
159 { \
160 typedef rettype (*type) parameters; \
161 \
162 inline operator type () const \
163 { \
164 return reinterpret_cast<type>(::rpl_func); \
165 } \
166 } func = {}; \
167 } \
168 _GL_EXTERN_C int _gl_cxxalias_dummy
169 #else
170 # define _GL_CXXALIAS_RPL_CAST_1(func,rpl_func,rettype,parameters) \
171 _GL_EXTERN_C int _gl_cxxalias_dummy
172 #endif
173
174 /* _GL_CXXALIAS_SYS (func, rettype, parameters);
175 declares a C++ alias called GNULIB_NAMESPACE::func
176 that redirects to the system provided function func, if GNULIB_NAMESPACE
177 is defined.
178 Example:
179 _GL_CXXALIAS_SYS (open, int, (const char *filename, int flags, ...));
180
181 Wrapping func in an object with an inline conversion operator
182 avoids a reference to func unless GNULIB_NAMESPACE::func is
183 actually used in the program. */
184 #if defined __cplusplus && defined GNULIB_NAMESPACE
185 # define _GL_CXXALIAS_SYS(func,rettype,parameters) \
186 namespace GNULIB_NAMESPACE \
187 { \
188 static const struct _gl_ ## func ## _wrapper \
189 { \
190 typedef rettype (*type) parameters; \
191 \
192 inline operator type () const \
193 { \
194 return ::func; \
195 } \
196 } func = {}; \
197 } \
198 _GL_EXTERN_C int _gl_cxxalias_dummy
199 #else
200 # define _GL_CXXALIAS_SYS(func,rettype,parameters) \
201 _GL_EXTERN_C int _gl_cxxalias_dummy
202 #endif
203
204 /* _GL_CXXALIAS_SYS_CAST (func, rettype, parameters);
205 is like _GL_CXXALIAS_SYS (func, rettype, parameters);
206 except that the C function func may have a slightly different declaration.
207 A cast is used to silence the "invalid conversion" error that would
208 otherwise occur. */
209 #if defined __cplusplus && defined GNULIB_NAMESPACE
210 # define _GL_CXXALIAS_SYS_CAST(func,rettype,parameters) \
211 namespace GNULIB_NAMESPACE \
212 { \
213 static const struct _gl_ ## func ## _wrapper \
214 { \
215 typedef rettype (*type) parameters; \
216 \
217 inline operator type () const \
218 { \
219 return reinterpret_cast<type>(::func); \
220 } \
221 } func = {}; \
222 } \
223 _GL_EXTERN_C int _gl_cxxalias_dummy
224 #else
225 # define _GL_CXXALIAS_SYS_CAST(func,rettype,parameters) \
226 _GL_EXTERN_C int _gl_cxxalias_dummy
227 #endif
228
229 /* _GL_CXXALIAS_SYS_CAST2 (func, rettype, parameters, rettype2, parameters2);
230 is like _GL_CXXALIAS_SYS (func, rettype, parameters);
231 except that the C function is picked among a set of overloaded functions,
232 namely the one with rettype2 and parameters2. Two consecutive casts
233 are used to silence the "cannot find a match" and "invalid conversion"
234 errors that would otherwise occur. */
235 #if defined __cplusplus && defined GNULIB_NAMESPACE
236 /* The outer cast must be a reinterpret_cast.
237 The inner cast: When the function is defined as a set of overloaded
238 functions, it works as a static_cast<>, choosing the designated variant.
239 When the function is defined as a single variant, it works as a
240 reinterpret_cast<>. The parenthesized cast syntax works both ways. */
241 # define _GL_CXXALIAS_SYS_CAST2(func,rettype,parameters,rettype2,parameters2) \
242 namespace GNULIB_NAMESPACE \
243 { \
244 static const struct _gl_ ## func ## _wrapper \
245 { \
246 typedef rettype (*type) parameters; \
247 \
248 inline operator type () const \
249 { \
250 return reinterpret_cast<type>((rettype2 (*) parameters2)(::func)); \
251 } \
252 } func = {}; \
253 } \
254 _GL_EXTERN_C int _gl_cxxalias_dummy
255 #else
256 # define _GL_CXXALIAS_SYS_CAST2(func,rettype,parameters,rettype2,parameters2) \
257 _GL_EXTERN_C int _gl_cxxalias_dummy
258 #endif
259
260 /* _GL_CXXALIASWARN (func);
261 causes a warning to be emitted when ::func is used but not when
262 GNULIB_NAMESPACE::func is used. func must be defined without overloaded
263 variants. */
264 #if defined __cplusplus && defined GNULIB_NAMESPACE
265 # define _GL_CXXALIASWARN(func) \
266 _GL_CXXALIASWARN_1 (func, GNULIB_NAMESPACE)
267 # define _GL_CXXALIASWARN_1(func,namespace) \
268 _GL_CXXALIASWARN_2 (func, namespace)
269 /* To work around GCC bug <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=43881>,
270 we enable the warning only when not optimizing. */
271 # if !__OPTIMIZE__
272 # define _GL_CXXALIASWARN_2(func,namespace) \
273 _GL_WARN_ON_USE (func, \
274 "The symbol ::" #func " refers to the system function. " \
275 "Use " #namespace "::" #func " instead.")
276 # elif __GNUC__ >= 3 && GNULIB_STRICT_CHECKING
277 # define _GL_CXXALIASWARN_2(func,namespace) \
278 extern __typeof__ (func) func
279 # else
280 # define _GL_CXXALIASWARN_2(func,namespace) \
281 _GL_EXTERN_C int _gl_cxxalias_dummy
282 # endif
283 #else
284 # define _GL_CXXALIASWARN(func) \
285 _GL_EXTERN_C int _gl_cxxalias_dummy
286 #endif
287
288 /* _GL_CXXALIASWARN1 (func, rettype, parameters_and_attributes);
289 causes a warning to be emitted when the given overloaded variant of ::func
290 is used but not when GNULIB_NAMESPACE::func is used. */
291 #if defined __cplusplus && defined GNULIB_NAMESPACE
292 # define _GL_CXXALIASWARN1(func,rettype,parameters_and_attributes) \
293 _GL_CXXALIASWARN1_1 (func, rettype, parameters_and_attributes, \
294 GNULIB_NAMESPACE)
295 # define _GL_CXXALIASWARN1_1(func,rettype,parameters_and_attributes,namespace) \
296 _GL_CXXALIASWARN1_2 (func, rettype, parameters_and_attributes, namespace)
297 /* To work around GCC bug <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=43881>,
298 we enable the warning only when not optimizing. */
299 # if !__OPTIMIZE__
300 # define _GL_CXXALIASWARN1_2(func,rettype,parameters_and_attributes,namespace) \
301 _GL_WARN_ON_USE_CXX (func, rettype, parameters_and_attributes, \
302 "The symbol ::" #func " refers to the system function. " \
303 "Use " #namespace "::" #func " instead.")
304 # elif __GNUC__ >= 3 && GNULIB_STRICT_CHECKING
305 # define _GL_CXXALIASWARN1_2(func,rettype,parameters_and_attributes,namespace) \
306 extern __typeof__ (func) func
307 # else
308 # define _GL_CXXALIASWARN1_2(func,rettype,parameters_and_attributes,namespace) \
309 _GL_EXTERN_C int _gl_cxxalias_dummy
310 # endif
311 #else
312 # define _GL_CXXALIASWARN1(func,rettype,parameters_and_attributes) \
313 _GL_EXTERN_C int _gl_cxxalias_dummy
314 #endif
315
316 #endif /* _GL_CXXDEFS_H */