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// $Id$
11// $Date$
12// $Revision$
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
40BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_OPEN
41
42template< AUX_WRAPPER_PARAMS(N) >
43struct 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(BOOST_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")
80 BOOST_CONSTEXPR 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)
84template< AUX_WRAPPER_PARAMS(N) >
85AUX_WRAPPER_VALUE_TYPE const AUX_WRAPPER_INST(N)::value;
86#endif
87
88BOOST_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

source code of include/boost/mpl/aux_/integral_wrapper.hpp