1 
2 // Copyright Aleksey Gurtovoy 2000-2006
3 //
4 // Distributed under the Boost Software License, Version 1.0.
5 // (See accompanying file LICENSE_1_0.txt or copy at
6 // http://www.boost.org/LICENSE_1_0.txt)
7 //
8 // See http://www.boost.org/libs/mpl for documentation.
9 
10 // $Id: integral_wrapper.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
11 // $Date: 2008-10-10 23:19:02 -0700 (Fri, 10 Oct 2008) $
12 // $Revision: 49267 $
13 
14 // NO INCLUDE GUARDS, THE HEADER IS INTENDED FOR MULTIPLE INCLUSION!
15 
16 #include <boost/mpl/integral_c_tag.hpp>
17 #include <boost/mpl/aux_/static_cast.hpp>
18 #include <boost/mpl/aux_/nttp_decl.hpp>
19 #include <boost/mpl/aux_/config/static_constant.hpp>
20 #include <boost/mpl/aux_/config/workaround.hpp>
21 
22 #include <boost/preprocessor/cat.hpp>
23 
24 #if !defined(AUX_WRAPPER_NAME)
25 #   define AUX_WRAPPER_NAME BOOST_PP_CAT(AUX_WRAPPER_VALUE_TYPE,_)
26 #endif
27 
28 #if !defined(AUX_WRAPPER_PARAMS)
29 #   define AUX_WRAPPER_PARAMS(N) BOOST_MPL_AUX_NTTP_DECL(AUX_WRAPPER_VALUE_TYPE, N)
30 #endif
31 
32 #if !defined(AUX_WRAPPER_INST)
33 #   if BOOST_WORKAROUND(__MWERKS__, <= 0x2407)
34 #       define AUX_WRAPPER_INST(value) AUX_WRAPPER_NAME< value >
35 #   else
36 #       define AUX_WRAPPER_INST(value) BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE::AUX_WRAPPER_NAME< value >
37 #   endif
38 #endif
39 
40 BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_OPEN
41 
42 template< AUX_WRAPPER_PARAMS(N) >
43 struct AUX_WRAPPER_NAME
44 {
45     BOOST_STATIC_CONSTANT(AUX_WRAPPER_VALUE_TYPE, value = N);
46 // agurt, 08/mar/03: SGI MIPSpro C++ workaround, have to #ifdef because some
47 // other compilers (e.g. MSVC) are not particulary happy about it
48 #if BOOST_WORKAROUND(__EDG_VERSION__, <= 238)
49     typedef struct AUX_WRAPPER_NAME type;
50 #else
51     typedef AUX_WRAPPER_NAME type;
52 #endif
53     typedef AUX_WRAPPER_VALUE_TYPE value_type;
54     typedef integral_c_tag tag;
55 
56 // have to #ifdef here: some compilers don't like the 'N + 1' form (MSVC),
57 // while some other don't like 'value + 1' (Borland), and some don't like
58 // either
59 #if BOOST_WORKAROUND(__EDG_VERSION__, <= 243)
60  private:
61     BOOST_STATIC_CONSTANT(AUX_WRAPPER_VALUE_TYPE, next_value = BOOST_MPL_AUX_STATIC_CAST(AUX_WRAPPER_VALUE_TYPE, (N + 1)));
62     BOOST_STATIC_CONSTANT(AUX_WRAPPER_VALUE_TYPE, prior_value = BOOST_MPL_AUX_STATIC_CAST(AUX_WRAPPER_VALUE_TYPE, (N - 1)));
63  public:
64     typedef AUX_WRAPPER_INST(next_value) next;
65     typedef AUX_WRAPPER_INST(prior_value) prior;
66 #elif BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x561)) \
67     || BOOST_WORKAROUND(__IBMCPP__, BOOST_TESTED_AT(502)) \
68     || (BOOST_WORKAROUND(__HP_aCC, <= 53800) && (BOOST_WORKAROUND(__hpxstd98, != 1)))
69     typedef AUX_WRAPPER_INST( BOOST_MPL_AUX_STATIC_CAST(AUX_WRAPPER_VALUE_TYPE, (N + 1)) ) next;
70     typedef AUX_WRAPPER_INST( BOOST_MPL_AUX_STATIC_CAST(AUX_WRAPPER_VALUE_TYPE, (N - 1)) ) prior;
71 #else
72     typedef AUX_WRAPPER_INST( BOOST_MPL_AUX_STATIC_CAST(AUX_WRAPPER_VALUE_TYPE, (value + 1)) ) next;
73     typedef AUX_WRAPPER_INST( BOOST_MPL_AUX_STATIC_CAST(AUX_WRAPPER_VALUE_TYPE, (value - 1)) ) prior;
74 #endif
75 
76     // enables uniform function call syntax for families of overloaded
77     // functions that return objects of both arithmetic ('int', 'long',
78     // 'double', etc.) and wrapped integral types (for an example, see
79     // "mpl/example/power.cpp")
operator AUX_WRAPPER_VALUE_TYPEAUX_WRAPPER_NAME80     operator AUX_WRAPPER_VALUE_TYPE() const { return static_cast<AUX_WRAPPER_VALUE_TYPE>(this->value); }
81 };
82 
83 #if !defined(BOOST_NO_INCLASS_MEMBER_INITIALIZATION)
84 template< AUX_WRAPPER_PARAMS(N) >
85 AUX_WRAPPER_VALUE_TYPE const AUX_WRAPPER_INST(N)::value;
86 #endif
87 
88 BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_CLOSE
89 
90 #undef AUX_WRAPPER_NAME
91 #undef AUX_WRAPPER_PARAMS
92 #undef AUX_WRAPPER_INST
93 #undef AUX_WRAPPER_VALUE_TYPE
94