returnType.h

 1
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22//-----------------------------------------------------------------------------
23
24#ifndef _UTIL_RETURNTYPE_H_
25#define _UTIL_RETURNTYPE_H_
26
27/// @file
28///
29/// Helper templates to determine the return type of functions.
30
31template <class R> struct ReturnType { typedef void ValueType; };
32
33template <class R,class A,class B,class C,class D,class E,class F,class G>
34struct ReturnType<R (*)(A,B,C,D,E,F,G)> { typedef R ValueType; };
35template <class R,class A,class B,class C,class D,class E,class F>
36struct ReturnType<R (*)(A,B,C,D,E,F)> { typedef R ValueType; };
37template <class R,class A,class B,class C,class D,class E>
38struct ReturnType<R (*)(A,B,C,D,E)> { typedef R ValueType; };
39template <class R,class A,class B,class C,class D>
40struct ReturnType<R (*)(A,B,C,D)> { typedef R ValueType; };
41template <class R,class A,class B,class C>
42struct ReturnType<R (*)(A,B,C)> { typedef R ValueType; };
43template <class R,class A,class B>
44struct ReturnType<R (*)(A,B)> { typedef R ValueType; };
45template <class R,class A>
46struct ReturnType<R (*)(A)> { typedef R ValueType; };
47template <class R>
48struct ReturnType<R (*)()> { typedef R ValueType; };
49
50template <class R,class O,class A,class B,class C,class D,class E,class F,class G>
51struct ReturnType<R (O::*)(A,B,C,D,E,F,G)> { typedef R ValueType; };
52template <class R,class O,class A,class B,class C,class D,class E,class F>
53struct ReturnType<R (O::*)(A,B,C,D,E,F)> { typedef R ValueType; };
54template <class R,class O,class A,class B,class C,class D,class E>
55struct ReturnType<R (O::*)(A,B,C,D,E)> { typedef R ValueType; };
56template <class R,class O,class A,class B,class C,class D>
57struct ReturnType<R (O::*)(A,B,C,D)> { typedef R ValueType; };
58template <class R,class O,class A,class B,class C>
59struct ReturnType<R (O::*)(A,B,C)> { typedef R ValueType; };
60template <class R,class O,class A,class B>
61struct ReturnType<R (O::*)(A,B)> { typedef R ValueType; };
62template <class R,class O,class A>
63struct ReturnType<R (O::*)(A)> { typedef R ValueType; };
64template <class R,class O>
65struct ReturnType<R (O::*)()> { typedef R ValueType; };
66
67#endif
68