/home/ntakagi/work/STLport-5.1.5/stlport/stl/type_manips.h Go to the documentation of this file. /* * * Copyright (c) 2003 * François Dumont * * This material is provided "as is", with absolutely no warranty expressed * or implied. Any use is at your own risk. * * Permission to use or copy this software for any purpose is hereby granted * without fee, provided the above notices are retained on all copies. * Permission to modify the code and to distribute modified code is granted, * provided the above notices are retained, and a notice that the code was * modified is included with the above copyright notice. * */ #ifndef _STLP_TYPE_MANIPS_H #define _STLP_TYPE_MANIPS_H _STLP_BEGIN_NAMESPACE struct __true_type {}; struct __false_type {}; #if defined (_STLP_USE_NAMESPACES) _STLP_MOVE_TO_PRIV_NAMESPACE using _STLP_STD::__true_type; using _STLP_STD::__false_type; _STLP_MOVE_TO_STD_NAMESPACE #endif //bool to type template <int _Is> struct __bool2type { typedef __true_type _Ret; }; _STLP_TEMPLATE_NULL struct __bool2type<1> { typedef __true_type _Ret; }; _STLP_TEMPLATE_NULL struct __bool2type<0> { typedef __false_type _Ret; }; //type to bool template <class __bool_type> struct __type2bool { enum {_Ret = 1}; }; _STLP_TEMPLATE_NULL struct __type2bool<__true_type> { enum {_Ret = 1}; }; _STLP_TEMPLATE_NULL struct __type2bool<__false_type> { enum {_Ret = 0}; }; //Negation template <class _BoolType> struct _Not { typedef __false_type _Ret; }; _STLP_TEMPLATE_NULL struct _Not<__false_type> { typedef __true_type _Ret; }; // logical and of 2 predicated template <class _P1, class _P2> struct _Land2 { typedef __false_type _Ret; }; _STLP_TEMPLATE_NULL struct _Land2<__true_type, __true_type> { typedef __true_type _Ret; }; // logical and of 3 predicated template <class _P1, class _P2, class _P3> struct _Land3 { typedef __false_type _Ret; }; _STLP_TEMPLATE_NULL struct _Land3<__true_type, __true_type, __true_type> { typedef __true_type _Ret; }; //logical or of 2 predicated template <class _P1, class _P2> struct _Lor2 { typedef __true_type _Ret; }; _STLP_TEMPLATE_NULL struct _Lor2<__false_type, __false_type> { typedef __false_type _Ret; }; // logical or of 3 predicated template <class _P1, class _P2, class _P3> struct _Lor3 { typedef __true_type _Ret; }; _STLP_TEMPLATE_NULL struct _Lor3<__false_type, __false_type, __false_type> { typedef __false_type _Ret; }; // class template __select // Selects one of two types based upon a boolean constant // Invocation: __select<_Cond, T, U>::Result // where: // flag is a compile-time boolean constant // T and U are types // Result evaluates to T if flag is true, and to U otherwise. // BEWARE: If the compiler do not support partial template specialization or nested template //classes the default behavior of the __select is to consider the condition as false and so return //the second template type!! #if defined (_STLP_CLASS_PARTIAL_SPECIALIZATION) template <bool _Cond, class _Tp1, class _Tp2> struct __select { typedef _Tp1 _Ret; }; template <class _Tp1, class _Tp2> struct __select<false, _Tp1, _Tp2> { typedef _Tp2 _Ret; }; # if defined (__BORLANDC__) template <class _CondT, class _Tp1, class _Tp2> struct __selectT { typedef _Tp1 _Ret; }; template <class _Tp1, class _Tp2> struct __selectT<__false_type, _Tp1, _Tp2> { typedef _Tp2 _Ret; }; # endif #else /* _STLP_CLASS_PARTIAL_SPECIALIZATION */ # if defined (_STLP_MEMBER_TEMPLATE_CLASSES) template <int _Cond> struct __select_aux { template <class _Tp1, class _Tp2> struct _In { typedef _Tp1 _Ret; }; }; _STLP_TEMPLATE_NULL struct __select_aux<0> { template <class _Tp1, class _Tp2> struct _In { typedef _Tp2 _Ret; }; }; template <int _Cond, class _Tp1, class _Tp2> struct __select { typedef typename __select_aux<_Cond>::_STLP_TEMPLATE _In<_Tp1, _Tp2>::_Ret _Ret; }; # else /* _STLP_MEMBER_TEMPLATE_CLASSES */ //default behavior template <int _Cond, class _Tp1, class _Tp2> struct __select { typedef _Tp2 _Ret; }; # endif /* _STLP_MEMBER_TEMPLATE_CLASSES */ #endif /* _STLP_CLASS_PARTIAL_SPECIALIZATION */ #if defined (_STLP_SIMULATE_PARTIAL_SPEC_FOR_TYPE_TRAITS) // Boris : simulation technique is used here according to Adobe Open Source License Version 1.0. // Copyright 2000 Adobe Systems Incorporated and others. All rights reserved. // Authors: Mat Marcus and Jesse Jones // The original version of this source code may be found at // http://opensource.adobe.com. // These are the discriminating functions template <class _Tp> char _STLP_CALL _IsSameFun(bool, _Tp const volatile*, _Tp const volatile*); // no implementation is required char* _STLP_CALL _IsSameFun(bool, ...); // no implementation is required template <class _Tp1, class _Tp2> struct _IsSame { static _Tp1* __null_rep1(); static _Tp2* __null_rep2(); enum { _Ret = (sizeof(_IsSameFun(false,__null_rep1(), __null_rep2())) == sizeof(char)) }; typedef typename __bool2type<_Ret>::_Ret _RetT; }; #else template <class _Tp1, class _Tp2> struct _IsSameAux { typedef __false_type _RetT; enum { _Ret = 0 }; }; template <class _Tp> struct _UnConstType { typedef _Tp _Type; }; template <class _Tp> struct _UnVolatileType { typedef _Tp _Type; }; template <class _Tp> struct _UnCVType { typedef typename _UnVolatileType<_Tp>::_Type _UnVType; typedef typename _UnConstType<_UnVType>::_Type _Type; }; # if defined (_STLP_CLASS_PARTIAL_SPECIALIZATION) template <class _Tp> struct _IsSameAux<_Tp, _Tp> { typedef __true_type _RetT; enum { _Ret = 1 }; }; # if !defined (_STLP_QUALIFIED_SPECIALIZATION_BUG) template <class _Tp> struct _UnConstType<const _Tp> { typedef _Tp _Type; }; template <class _Tp> struct _UnVolatileType<volatile _Tp> { typedef _Tp _Type; }; # endif # if defined(__BORLANDC__) template<class _Tp> struct _UnConstPtr { typedef _Tp _Type; }; template<class _Tp> struct _UnConstPtr<_Tp*> { typedef _Tp _Type; }; template<class _Tp> struct _UnConstPtr<const _Tp*> { typedef _Tp _Type; }; # endif # endif template <class _Tp1, class _Tp2> struct _IsSame { typedef typename _UnCVType<_Tp1>::_Type _Type1; typedef typename _UnCVType<_Tp2>::_Type _Type2; typedef _IsSameAux<_Type1, _Type2> _Aux; enum { _Ret = _Aux::_Ret }; typedef typename _Aux::_RetT _RetT; }; #endif /* * The following struct will tell you if 2 types are the same, the limitations are: * - it compares the types without the const or volatile qualifiers, int and const int * will be considered as same for instance. * - the previous remarks do not apply to pointer types, int* and int const* won't be * considered as comparable. (int * and int *const are). */ template <class _Tp1, class _Tp2> struct _AreSameUnCVTypes { enum { _Same = _IsSame<_Tp1, _Tp2>::_Ret }; typedef typename _IsSame<_Tp1, _Tp2>::_RetT _Ret; }; /* Rather than introducing a new macro for the following constrution we use * an existing one (_STLP_DONT_SIMULATE_PARTIAL_SPEC_FOR_TYPE_TRAITS) that * is used for a similar feature. */ #if !defined (_STLP_DONT_SIMULATE_PARTIAL_SPEC_FOR_TYPE_TRAITS) template <class _Src, class _Dst> struct _ConversionHelper { static char _Test(bool, _Dst); static char* _Test(bool, ...); static _Src _MakeSource(); }; template <class _Src, class _Dst> struct _IsConvertible { typedef _ConversionHelper<_Src*, const volatile _Dst*> _H; enum { value = (sizeof(char) == sizeof(_H::_Test(false, _H::_MakeSource()))) }; typedef typename __bool2type<value>::_Ret _Ret; }; /* This struct is intended to say if a pointer can be convertible to an other * taking into account cv qualifications. It shouldn't be instanciated with * something else than pointer type as it uses pass by value parameter that * results in compilation error when parameter type has a special memory * alignment */ template <class _Src, class _Dst> struct _IsCVConvertible { #if !defined (__BORLANDC__) typedef _ConversionHelper<_Src, _Dst> _H; enum { value = (sizeof(char) == sizeof(_H::_Test(false, _H::_MakeSource()))) }; #else enum { _Is1 = __type2bool<_IsConst<_Src>::_Ret>::_Ret }; enum { _Is2 = _IsConvertible<_UnConstPtr<_Src>::_Type, _UnConstPtr<_Dst>::_Type>::value }; enum { value = _Is1 ? 0 : _Is2 }; #endif typedef typename __bool2type<value>::_Ret _Ret; }; #else template <class _Src, class _Dst> struct _IsConvertible { enum {value = 0}; typedef __false_type _Ret; }; #endif template <class _Tp> struct _IsConst { typedef __false_type _Ret; }; #if defined (_STLP_CLASS_PARTIAL_SPECIALIZATION) && !defined (_STLP_QUALIFIED_SPECIALIZATION_BUG) template <class _Tp> struct _IsConst <const _Tp> { typedef __true_type _Ret; }; #endif # if defined(__BORLANDC__) template<class _Tp> struct _IsConst <const _Tp*> { typedef __true_type _Ret; }; template<class _Tp> struct _IsConst <const volatile _Tp*> { typedef __true_type _Ret; }; # endif _STLP_END_NAMESPACE #endif /* _STLP_TYPE_MANIPS_H */

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