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