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type-traits.h
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1 #ifndef TYPE_TRAITS_H
2 #define TYPE_TRAITS_H
3 
4 template <typename T>
5 struct TypeTraits
6 {
7 private:
8  struct NullType {};
9  template <typename U> struct UnConst
10  {
11  typedef U Result;
12  };
13  template <typename U> struct UnConst<const U>
14  {
15  typedef U Result;
16  };
17  template <typename U> struct ReferenceTraits
18  {
19  enum { IsReference = 0};
20  typedef U ReferencedType;
21  };
22  template <typename U> struct ReferenceTraits<U&>
23  {
24  enum { IsReference = 1};
25  typedef U ReferencedType;
26  };
27  template <typename U> struct PointerTraits
28  {
29  enum { IsPointer = 0};
30  typedef U PointeeType;
31  };
32  template <typename U> struct PointerTraits<U *>
33  {
34  enum { IsPointer = 1};
35  typedef U PointeeType;
36  };
37  template <typename U> struct FunctionPtrTraits
38  {
39  enum { IsFunctionPointer = 0};
40  };
41  template <typename U>
42  struct FunctionPtrTraits <U (*)(void)>
43  {
44  enum { IsFunctionPointer = 1};
45  enum { nArgs = 0};
46  typedef U ReturnType;
47  };
48  template <typename U, typename V1>
49  struct FunctionPtrTraits <U (*)(V1)>
50  {
51  enum { IsFunctionPointer = 1};
52  enum { nArgs = 1};
53  typedef U ReturnType;
54  typedef V1 Arg1Type;
55  };
56  template <typename U, typename V1, typename V2>
57  struct FunctionPtrTraits <U (*)(V1,V2)>
58  {
59  enum { IsFunctionPointer = 1};
60  enum { nArgs = 2};
61  typedef U ReturnType;
62  typedef V1 Arg1Type;
63  typedef V2 Arg2Type;
64  };
65  template <typename U, typename V1, typename V2,
66  typename V3>
67  struct FunctionPtrTraits <U (*)(V1,V2,V3)>
68  {
69  enum { IsFunctionPointer = 1};
70  enum { nArgs = 3};
71  typedef U ReturnType;
72  typedef V1 Arg1Type;
73  typedef V2 Arg2Type;
74  typedef V3 Arg3Type;
75  };
76  template <typename U, typename V1, typename V2,
77  typename V3, typename V4>
78  struct FunctionPtrTraits <U (*)(V1,V2,V3,V4)>
79  {
80  enum { IsFunctionPointer = 1};
81  enum { nArgs = 4};
82  typedef U ReturnType;
83  typedef V1 Arg1Type;
84  typedef V2 Arg2Type;
85  typedef V3 Arg3Type;
86  typedef V4 Arg4Type;
87  };
88  template <typename U, typename V1, typename V2,
89  typename V3, typename V4,
90  typename V5>
91  struct FunctionPtrTraits <U (*)(V1,V2,V3,V4,V5)>
92  {
93  enum { IsFunctionPointer = 1};
94  enum { nArgs = 5};
95  typedef U ReturnType;
96  typedef V1 Arg1Type;
97  typedef V2 Arg2Type;
98  typedef V3 Arg3Type;
99  typedef V4 Arg4Type;
100  typedef V5 Arg5Type;
101  };
102  template <typename U, typename V1, typename V2,
103  typename V3, typename V4,
104  typename V5, typename V6>
105  struct FunctionPtrTraits <U (*)(V1,V2,V3,V4,V5,V6)>
106  {
107  enum { IsFunctionPointer = 1};
108  enum { nArgs = 6};
109  typedef U ReturnType;
110  typedef V1 Arg1Type;
111  typedef V2 Arg2Type;
112  typedef V3 Arg3Type;
113  typedef V4 Arg4Type;
114  typedef V5 Arg5Type;
115  typedef V6 Arg6Type;
116  };
117  template <typename U> struct PtrToMemberTraits
118  {
119  enum { IsPointerToMember = 0};
120  };
121  template <typename U, typename V>
122  struct PtrToMemberTraits <U (V::*) (void)>
123  {
124  enum { IsPointerToMember = 1};
125  enum { nArgs = 0};
126  typedef U ReturnType;
127  };
128  template <typename U, typename V>
129  struct PtrToMemberTraits <U (V::*) (void) const>
130  {
131  enum { IsPointerToMember = 1};
132  enum { nArgs = 0};
133  typedef U ReturnType;
134  };
135  template <typename U, typename V,typename W1>
136  struct PtrToMemberTraits <U (V::*) (W1)>
137  {
138  enum { IsPointerToMember = 1};
139  enum { nArgs = 1};
140  typedef U ReturnType;
141  typedef W1 Arg1Type;
142  };
143  template <typename U, typename V,typename W1>
144  struct PtrToMemberTraits <U (V::*) (W1) const>
145  {
146  enum { IsPointerToMember = 1};
147  enum { nArgs = 1};
148  typedef U ReturnType;
149  typedef W1 Arg1Type;
150  };
151  template <typename U, typename V,typename W1, typename W2>
152  struct PtrToMemberTraits <U (V::*) (W1,W2)>
153  {
154  enum { IsPointerToMember = 1};
155  enum { nArgs = 2};
156  typedef U ReturnType;
157  typedef W1 Arg1Type;
158  typedef W2 Arg2Type;
159  };
160  template <typename U, typename V,typename W1, typename W2>
161  struct PtrToMemberTraits <U (V::*) (W1,W2) const>
162  {
163  enum { IsPointerToMember = 1};
164  enum { nArgs = 2};
165  typedef U ReturnType;
166  typedef W1 Arg1Type;
167  typedef W2 Arg2Type;
168  };
169  template <typename U, typename V,
170  typename W1, typename W2,
171  typename W3>
172  struct PtrToMemberTraits <U (V::*) (W1,W2,W3)>
173  {
174  enum { IsPointerToMember = 1};
175  enum { nArgs = 3};
176  typedef U ReturnType;
177  typedef W1 Arg1Type;
178  typedef W2 Arg2Type;
179  typedef W3 Arg3Type;
180  };
181  template <typename U, typename V,
182  typename W1, typename W2,
183  typename W3>
184  struct PtrToMemberTraits <U (V::*) (W1,W2,W3) const>
185  {
186  enum { IsPointerToMember = 1};
187  enum { nArgs = 3};
188  typedef U ReturnType;
189  typedef W1 Arg1Type;
190  typedef W2 Arg2Type;
191  typedef W3 Arg3Type;
192  };
193  template <typename U, typename V,
194  typename W1, typename W2,
195  typename W3, typename W4>
196  struct PtrToMemberTraits <U (V::*) (W1,W2,W3,W4)>
197  {
198  enum { IsPointerToMember = 1};
199  enum { nArgs = 4};
200  typedef U ReturnType;
201  typedef W1 Arg1Type;
202  typedef W2 Arg2Type;
203  typedef W3 Arg3Type;
204  typedef W4 Arg4Type;
205  };
206  template <typename U, typename V,
207  typename W1, typename W2,
208  typename W3, typename W4>
209  struct PtrToMemberTraits <U (V::*) (W1,W2,W3,W4) const>
210  {
211  enum { IsPointerToMember = 1};
212  enum { nArgs = 4};
213  typedef U ReturnType;
214  typedef W1 Arg1Type;
215  typedef W2 Arg2Type;
216  typedef W3 Arg3Type;
217  typedef W4 Arg4Type;
218  };
219  template <typename U, typename V,
220  typename W1, typename W2,
221  typename W3, typename W4,
222  typename W5>
223  struct PtrToMemberTraits <U (V::*) (W1,W2,W3,W4,W5)>
224  {
225  enum { IsPointerToMember = 1};
226  enum { nArgs = 5};
227  typedef U ReturnType;
228  typedef W1 Arg1Type;
229  typedef W2 Arg2Type;
230  typedef W3 Arg3Type;
231  typedef W4 Arg4Type;
232  typedef W5 Arg5Type;
233  };
234  template <typename U, typename V,
235  typename W1, typename W2,
236  typename W3, typename W4,
237  typename W5>
238  struct PtrToMemberTraits <U (V::*) (W1,W2,W3,W4,W5) const>
239  {
240  enum { IsPointerToMember = 1};
241  enum { nArgs = 5};
242  typedef U ReturnType;
243  typedef W1 Arg1Type;
244  typedef W2 Arg2Type;
245  typedef W3 Arg3Type;
246  typedef W4 Arg4Type;
247  typedef W5 Arg5Type;
248  };
249  template <typename U, typename V,
250  typename W1, typename W2,
251  typename W3, typename W4,
252  typename W5, typename W6>
253  struct PtrToMemberTraits <U (V::*) (W1,W2,W3,W4,W5,W6)>
254  {
255  enum { IsPointerToMember = 1};
256  enum { nArgs = 6};
257  typedef U ReturnType;
258  typedef W1 Arg1Type;
259  typedef W2 Arg2Type;
260  typedef W3 Arg3Type;
261  typedef W4 Arg4Type;
262  typedef W5 Arg5Type;
263  typedef W6 Arg6Type;
264  };
265  template <typename U, typename V,
266  typename W1, typename W2,
267  typename W3, typename W4,
268  typename W5, typename W6>
269  struct PtrToMemberTraits <U (V::*) (W1,W2,W3,W4,W5,W6) const>
270  {
271  enum { IsPointerToMember = 1};
272  enum { nArgs = 6};
273  typedef U ReturnType;
274  typedef W1 Arg1Type;
275  typedef W2 Arg2Type;
276  typedef W3 Arg3Type;
277  typedef W4 Arg4Type;
278  typedef W5 Arg5Type;
279  typedef W6 Arg6Type;
280  };
281 
282 public:
283  typedef typename UnConst<T>::Result NonConstType;
284  typedef typename ReferenceTraits<T>::ReferencedType ReferencedType;
285  typedef typename PointerTraits<T>::PointeeType PointeeType;
286  enum { IsPointerToMember = PtrToMemberTraits<T>::IsPointerToMember};
287  enum { IsPointer = PointerTraits<T>::IsPointer};
288  enum { IsReference = ReferenceTraits<T>::IsReference};
289  enum { IsFunctionPointer = FunctionPtrTraits<T>::IsFunctionPointer};
290  typedef PtrToMemberTraits<T> PointerToMemberTraits;
291  typedef FunctionPtrTraits<T> FunctionPointerTraits;
292 };
293 
294 
295 #endif /* TYPE_TRAITS_H */