Ne.app NeANT
The Ne.app NeANT User module of the NeANT distribution.
use_facet.h
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1
32#ifndef _RWSTD_USE_FACET_H_INCLUDED
33#define _RWSTD_USE_FACET_H_INCLUDED
34
35
36#include <new>
37#include <rw/_defs.h>
38
39#include "access.h"
40
41
42// helper macro _RWSTD_DEFINE_FACET_FACTORY() defines a facet factory
43// function called to construct, on demand, objects of specializations
44// of facet class templates
45// _byname facets are constructed on the heap while ordinary facets
46// are constructed in static memory for efficiency and to avoid leaks,
47// and are not destroyed during program lifetime
48
49#ifndef _RWSTD_NO_BYNAME_FACET
50
51 // definition for facets that come in both forms, plain and _byname
52# define _RWSTD_DEFINE_FACET_FACTORY(Linkage, Facet, TArgs, fid) \
53 typedef _STD:: Facet TArgs __rw_ ## fid ## _facet; \
54 _RWSTD_NAMESPACE (__rw) \
55 { \
56 Linkage __rw_facet* \
57 __rw_ct_ ## fid (_RWSTD_SIZE_T ref, const char *name) \
58 { \
59 __rw_facet* pfacet; \
60 if (name) { \
61 /* construct a _byname facet on the heap */ \
62 pfacet = new _STD:: Facet ## _byname TArgs (name, ref); \
63 } \
64 else { \
65 /* construct an ordinary facet in static memory */ \
66 static union { \
67 void *align_; \
68 char data_ [sizeof (__rw_ ## fid ## _facet)]; \
69 } f; \
70 static __rw_facet* const pf = \
71 new (&f) __rw_ ## fid ## _facet (ref); \
72 pfacet = pf; \
73 } \
74 /* set the pointer to the facet id */ \
75 __rw_access::_C_get_pid (*pfacet) = \
76 &(__rw_access::_C_get_id (__rw_ ## fid ## _facet::id)); \
77 return pfacet; \
78 } \
79 } /* namespace __rw */ \
80 typedef void __rw_unused_type
81
82#else // if defined (_RWSTD_NO_BYNAME_FACET)
83
84 // definition for facets such as num_get that do not have a _byname form
85# define _RWSTD_DEFINE_FACET_FACTORY(Linkage, Facet, TArgs, fid) \
86 typedef _STD:: Facet TArgs __rw_ ## fid ## _facet; \
87 _RWSTD_NAMESPACE (__rw) \
88 { \
89 Linkage __rw_facet* \
90 __rw_ct_ ## fid (_RWSTD_SIZE_T ref, const char*) \
91 { \
92 /* construct an ordinary facet in static memory */ \
93 static union { \
94 void *align_; \
95 char data_ [sizeof (__rw_ ## fid ## _facet)]; \
96 } f; \
97 static __rw_facet* const pf = \
98 new (&f) __rw_ ## fid ## _facet (ref); \
99 /* set the pointer to the facet id */ \
100 __rw_access::_C_get_pid (*pf) = \
101 &(__rw_access::_C_get_id (__rw_ ## fid ## _facet::id)); \
102 return pf; \
103 } \
104 } /* namespace __rw */ \
105 typedef void __rw_unused_type
106
107#endif // _RWSTD_NO_BYNAME_FACET
108
109
110#ifndef _RWSTD_NO_SPECIALIZED_FACET_ID
111 // provide definitions of explicit specializations of static
112 // template data members to guarantee a single instance of
113 // each in a program when the compiler or linker don't
114 // (e.g., VisualAge C++ on AIX)
115# define _RWSTD_SPECIALIZE_FACET_ID(Facet, TArgs) \
116 _RWSTD_NAMESPACE (std) { \
117 _RWSTD_SPECIALIZED_CLASS \
118 _RW::__rw_facet_id Facet TArgs:: \
119 id (_RW::__rw_facet_id::_C_Init); \
120 } \
121 typedef void __rw_unused_type
122#else // if defined (_RWSTD_NO_SPECIALIZED_FACET_ID)
123 // facet id's will not be explicitly specialized
124# define _RWSTD_SPECIALIZE_FACET_ID(ignore1, ignore2) \
125 typedef void __rw_unused_type
126#endif // _RWSTD_NO_SPECIALIZED_FACET_ID
127
128
129#define _RWSTD_SPECIALIZE_USE_FACET(fid) \
130 _RWSTD_NAMESPACE (__rw) { \
131 _RWSTD_EXPORT \
132 const __rw_facet* \
133 __rw_get_facet_by_id \
134 (const _STD::locale &__loc, \
135 const __rw_facet_id&, \
136 const __rw_ ## fid ## _facet*) { \
137 return __rw_get_std_facet (__loc, __rw_facet::_C_ ## fid, \
138 __rw_ct_ ## fid); \
139 } \
140 } \
141 typedef void __rw_unused_type
142
143#endif // _RWSTD_USE_FACET_H_INCLUDED
_defs.h
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