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char16ptr.h
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1 // © 2017 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3
4 // char16ptr.h
5 // created: 2017feb28 Markus W. Scherer
6
7 #ifndef __CHAR16PTR_H__
8 #define __CHAR16PTR_H__
9
10 #include <cstddef>
11 #include "unicode/utypes.h"
12
20 U_NAMESPACE_BEGIN
21
27 #ifdef U_ALIASING_BARRIER
28 // Use the predefined value.
29 #elif (defined(__clang__) || defined(__GNUC__)) && U_PLATFORM != U_PF_BROWSER_NATIVE_CLIENT
30 # define U_ALIASING_BARRIER(ptr) asm volatile("" : : "rm"(ptr) : "memory")
31 #endif
32
33 // Do not use #ifndef U_HIDE_DRAFT_API for the following class, it
34 // is now used in place of UChar* in several stable C++ methods
39 class U_COMMON_API Char16Ptr U_FINAL {
40 public:
46 inline Char16Ptr(char16_t *p);
47 #if !U_CHAR16_IS_TYPEDEF
48
53 inline Char16Ptr(uint16_t *p);
54 #endif
55 #if U_SIZEOF_WCHAR_T==2 || defined(U_IN_DOXYGEN)
56
62 inline Char16Ptr(wchar_t *p);
63 #endif
64
69 inline Char16Ptr(std::nullptr_t p);
74 inline ~Char16Ptr();
75
81 inline char16_t *get() const;
87 inline operator char16_t *() const { return get(); }
88
89 private:
90 Char16Ptr() = delete;
91
92 #ifdef U_ALIASING_BARRIER
93 template<typename T> static char16_t *cast(T *t) {
94 U_ALIASING_BARRIER(t);
95 return reinterpret_cast<char16_t *>(t);
96 }
97
98 char16_t *p_;
99 #else
100 union {
101 char16_t *cp;
102 uint16_t *up;
103 wchar_t *wp;
104 } u_;
105 #endif
106 };
107
108 #ifdef U_ALIASING_BARRIER
109
110 Char16Ptr::Char16Ptr(char16_t *p) : p_(p) {}
111 #if !U_CHAR16_IS_TYPEDEF
112 Char16Ptr::Char16Ptr(uint16_t *p) : p_(cast(p)) {}
113 #endif
114 #if U_SIZEOF_WCHAR_T==2
115 Char16Ptr::Char16Ptr(wchar_t *p) : p_(cast(p)) {}
116 #endif
117 Char16Ptr::Char16Ptr(std::nullptr_t p) : p_(p) {}
118 Char16Ptr::~Char16Ptr() {
119 U_ALIASING_BARRIER(p_);
120 }
121
122 char16_t *Char16Ptr::get() const { return p_; }
123
124 #else
125
126 Char16Ptr::Char16Ptr(char16_t *p) { u_.cp = p; }
127 #if !U_CHAR16_IS_TYPEDEF
128 Char16Ptr::Char16Ptr(uint16_t *p) { u_.up = p; }
129 #endif
130 #if U_SIZEOF_WCHAR_T==2
131 Char16Ptr::Char16Ptr(wchar_t *p) { u_.wp = p; }
132 #endif
133 Char16Ptr::Char16Ptr(std::nullptr_t p) { u_.cp = p; }
134 Char16Ptr::~Char16Ptr() {}
135
136 char16_t *Char16Ptr::get() const { return u_.cp; }
137
138 #endif
139
140 // Do not use #ifndef U_HIDE_DRAFT_API for the following class, it is
141 // now used in place of const UChar* in several stable C++ methods
146 class U_COMMON_API ConstChar16Ptr U_FINAL {
147 public:
153 inline ConstChar16Ptr(const char16_t *p);
154 #if !U_CHAR16_IS_TYPEDEF
155
160 inline ConstChar16Ptr(const uint16_t *p);
161 #endif
162 #if U_SIZEOF_WCHAR_T==2 || defined(U_IN_DOXYGEN)
163
169 inline ConstChar16Ptr(const wchar_t *p);
170 #endif
171
176 inline ConstChar16Ptr(const std::nullptr_t p);
177
182 inline ~ConstChar16Ptr();
183
189 inline const char16_t *get() const;
195 inline operator const char16_t *() const { return get(); }
196
197 private:
198 ConstChar16Ptr() = delete;
199
200 #ifdef U_ALIASING_BARRIER
201 template<typename T> static const char16_t *cast(const T *t) {
202 U_ALIASING_BARRIER(t);
203 return reinterpret_cast<const char16_t *>(t);
204 }
205
206 const char16_t *p_;
207 #else
208 union {
209 const char16_t *cp;
210 const uint16_t *up;
211 const wchar_t *wp;
212 } u_;
213 #endif
214 };
215
216 #ifdef U_ALIASING_BARRIER
217
218 ConstChar16Ptr::ConstChar16Ptr(const char16_t *p) : p_(p) {}
219 #if !U_CHAR16_IS_TYPEDEF
220 ConstChar16Ptr::ConstChar16Ptr(const uint16_t *p) : p_(cast(p)) {}
221 #endif
222 #if U_SIZEOF_WCHAR_T==2
223 ConstChar16Ptr::ConstChar16Ptr(const wchar_t *p) : p_(cast(p)) {}
224 #endif
225 ConstChar16Ptr::ConstChar16Ptr(const std::nullptr_t p) : p_(p) {}
226 ConstChar16Ptr::~ConstChar16Ptr() {
227 U_ALIASING_BARRIER(p_);
228 }
229
230 const char16_t *ConstChar16Ptr::get() const { return p_; }
231
232 #else
233
234 ConstChar16Ptr::ConstChar16Ptr(const char16_t *p) { u_.cp = p; }
235 #if !U_CHAR16_IS_TYPEDEF
236 ConstChar16Ptr::ConstChar16Ptr(const uint16_t *p) { u_.up = p; }
237 #endif
238 #if U_SIZEOF_WCHAR_T==2
239 ConstChar16Ptr::ConstChar16Ptr(const wchar_t *p) { u_.wp = p; }
240 #endif
241 ConstChar16Ptr::ConstChar16Ptr(const std::nullptr_t p) { u_.cp = p; }
242 ConstChar16Ptr::~ConstChar16Ptr() {}
243
244 const char16_t *ConstChar16Ptr::get() const { return u_.cp; }
245
246 #endif
247
255 inline const UChar *toUCharPtr(const char16_t *p) {
256 #ifdef U_ALIASING_BARRIER
257 U_ALIASING_BARRIER(p);
258 #endif
259 return reinterpret_cast<const UChar *>(p);
260 }
261
269 inline UChar *toUCharPtr(char16_t *p) {
270 #ifdef U_ALIASING_BARRIER
271 U_ALIASING_BARRIER(p);
272 #endif
273 return reinterpret_cast<UChar *>(p);
274 }
275
283 inline const OldUChar *toOldUCharPtr(const char16_t *p) {
284 #ifdef U_ALIASING_BARRIER
285 U_ALIASING_BARRIER(p);
286 #endif
287 return reinterpret_cast<const OldUChar *>(p);
288 }
289
297 inline OldUChar *toOldUCharPtr(char16_t *p) {
298 #ifdef U_ALIASING_BARRIER
299 U_ALIASING_BARRIER(p);
300 #endif
301 return reinterpret_cast<OldUChar *>(p);
302 }
303
304 U_NAMESPACE_END
305
306 #endif // __CHAR16PTR_H__
OldUChar
uint16_t OldUChar
Default ICU 58 definition of UChar.
Definition: umachine.h:376
icu::toOldUCharPtr
OldUChar * toOldUCharPtr(char16_t *p)
Converts from char16_t * to OldUChar *.
Definition: char16ptr.h:297
U_NAMESPACE_BEGIN
#define U_NAMESPACE_BEGIN
This is used to begin a declaration of a public ICU C++ API.
Definition: uversion.h:131
icu::toUCharPtr
UChar * toUCharPtr(char16_t *p)
Converts from char16_t * to UChar *.
Definition: char16ptr.h:269
UChar
uint16_t UChar
The base type for UTF-16 code units and pointers.
Definition: umachine.h:349
U_NAMESPACE_END
#define U_NAMESPACE_END
This is used to end a declaration of a public ICU C++ API.
Definition: uversion.h:132
icu::Char16Ptr
char16_t * wrapper with implicit conversion from distinct but bit-compatible pointer types...
Definition: char16ptr.h:39
icu::ConstChar16Ptr
const char16_t * wrapper with implicit conversion from distinct but bit-compatible pointer types...
Definition: char16ptr.h:146
utypes.h
Basic definitions for ICU, for both C and C++ APIs.
U_COMMON_API
#define U_COMMON_API
Set to export library symbols from inside the common library, and to import them from outside...
Definition: utypes.h:359