author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 04 Oct 2010 02:56:42 +0300 | |
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parent 0 | e4d67989cc36 |
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/* |
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* |
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* Copyright (c) 1996,1997 |
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* Silicon Graphics Computer Systems, Inc. |
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* |
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* Copyright (c) 1997 |
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* Moscow Center for SPARC Technology |
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* |
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* Copyright (c) 1999 |
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* Boris Fomitchev |
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* |
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* This material is provided "as is", with absolutely no warranty expressed |
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* or implied. Any use is at your own risk. |
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* |
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* Permission to use or copy this software for any purpose is hereby granted |
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* without fee, provided the above notices are retained on all copies. |
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* Permission to modify the code and to distribute modified code is granted, |
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* provided the above notices are retained, and a notice that the code was |
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* modified is included with the above copyright notice. |
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* |
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*/ |
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#ifndef _STLP_TYPE_TRAITS_H |
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#define _STLP_TYPE_TRAITS_H |
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/* |
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This header file provides a framework for allowing compile time dispatch |
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based on type attributes. This is useful when writing template code. |
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For example, when making a copy of an array of an unknown type, it helps |
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to know if the type has a trivial copy constructor or not, to help decide |
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if a memcpy can be used. |
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The class template __type_traits provides a series of typedefs each of |
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which is either __true_type or __false_type. The argument to |
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__type_traits can be any type. The typedefs within this template will |
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attain their correct values by one of these means: |
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1. The general instantiation contain conservative values which work |
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for all types. |
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2. Specializations may be declared to make distinctions between types. |
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3. Some compilers (such as the Silicon Graphics N32 and N64 compilers) |
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will automatically provide the appropriate specializations for all |
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types. |
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EXAMPLE: |
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//Copy an array of elements which have non-trivial copy constructors |
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template <class T> void copy(T* source, T* destination, int n, __false_type); |
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//Copy an array of elements which have trivial copy constructors. Use memcpy. |
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template <class T> void copy(T* source, T* destination, int n, __true_type); |
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//Copy an array of any type by using the most efficient copy mechanism |
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template <class T> inline void copy(T* source,T* destination,int n) { |
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copy(source, destination, n, |
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typename __type_traits<T>::has_trivial_copy_constructor()); |
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} |
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*/ |
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#ifdef __WATCOMC__ |
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# include <stl/_cwchar.h> |
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#endif |
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_STLP_BEGIN_NAMESPACE |
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struct __true_type {}; |
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struct __false_type {}; |
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template <int _Is> struct __bool2type { |
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typedef __false_type _Ret; |
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}; |
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_STLP_TEMPLATE_NULL |
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struct __bool2type<1> { typedef __true_type _Ret; }; |
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_STLP_TEMPLATE_NULL |
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struct __bool2type<0> { typedef __false_type _Ret; }; |
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// logical end of 3 predicated |
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template <class _P1, class _P2, class _P3> |
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struct _Land3 { |
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typedef __false_type _Ret; |
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}; |
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_STLP_TEMPLATE_NULL |
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struct _Land3<__true_type, __true_type, __true_type> { |
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typedef __true_type _Ret; |
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}; |
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// Forward declarations. |
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template <class _Tp> struct __type_traits; |
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template <int _IsPOD> struct __type_traits_aux { |
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typedef __false_type has_trivial_default_constructor; |
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typedef __false_type has_trivial_copy_constructor; |
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typedef __false_type has_trivial_assignment_operator; |
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typedef __false_type has_trivial_destructor; |
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typedef __false_type is_POD_type; |
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}; |
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_STLP_TEMPLATE_NULL |
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struct __type_traits_aux<0> { |
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typedef __false_type has_trivial_default_constructor; |
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typedef __false_type has_trivial_copy_constructor; |
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typedef __false_type has_trivial_assignment_operator; |
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typedef __false_type has_trivial_destructor; |
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typedef __false_type is_POD_type; |
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}; |
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_STLP_TEMPLATE_NULL |
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struct __type_traits_aux<1> { |
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typedef __true_type has_trivial_default_constructor; |
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typedef __true_type has_trivial_copy_constructor; |
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typedef __true_type has_trivial_assignment_operator; |
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typedef __true_type has_trivial_destructor; |
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typedef __true_type is_POD_type; |
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}; |
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# ifdef _STLP_SIMULATE_PARTIAL_SPEC_FOR_TYPE_TRAITS |
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// Boris : simulation technique is used here according to Adobe Open Source License Version 1.0. |
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// Copyright 2000 Adobe Systems Incorporated and others. All rights reserved. |
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// Authors: Mat Marcus and Jesse Jones |
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// The original version of this source code may be found at |
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// http://opensource.adobe.com. |
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125 |
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struct _PointerShim { |
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// Since the compiler only allows at most one non-trivial |
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// implicit conversion we can make use of a shim class to |
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// be sure that IsPtr below doesn't accept classes with |
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// implicit pointer conversion operators |
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_PointerShim(const volatile void*); // no implementation |
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}; |
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133 |
|
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// These are the discriminating functions |
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135 |
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char _STLP_CALL _IsP(bool, _PointerShim); // no implementation is required |
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char* _STLP_CALL _IsP(bool, ...); // no implementation is required |
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138 |
|
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template <class _Tp> |
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char _STLP_CALL _IsSameFun(bool, _Tp*, _Tp*); // no implementation is required |
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char* _STLP_CALL _IsSameFun(bool, ...); // no implementation is required |
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142 |
|
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template <class _Tp1, class _Tp2> |
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struct _IsSame { |
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// boris : check! |
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static _Tp1* __null_rep1(); |
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static _Tp2* __null_rep2(); |
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enum { _Ret = (sizeof(_IsSameFun(false,__null_rep1(),__null_rep2())) == sizeof(char)) }; |
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}; |
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150 |
|
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template <class _Tp> |
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struct _IsPtr { |
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153 |
|
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// This template meta function takes a type T |
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// and returns true exactly when T is a pointer. |
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// One can imagine meta-functions discriminating on |
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// other criteria. |
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static _Tp& __null_rep(); |
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enum { _Ret = (sizeof(_IsP(false,__null_rep())) == sizeof(char)) }; |
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|
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}; |
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162 |
|
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template <class _Tp> |
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struct _IsPtrType { |
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enum { _Is = _IsPtr<_Tp>::_Ret } ; |
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typedef __bool2type< _Is > _BT; |
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typedef typename _BT::_Ret _Type; |
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static _Type _Ret() { return _Type(); } |
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}; |
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170 |
|
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template <class _Tp1, class _Tp2> |
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struct _BothPtrType { |
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typedef __bool2type< _IsPtr<_Tp1>::_Ret> _B1; |
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typedef __bool2type< _IsPtr<_Tp2>::_Ret> _B2; |
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typedef typename _B1::_Ret _Type1; |
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typedef typename _B2::_Ret _Type2; |
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typedef typename _Land3<_Type1, _Type2, __true_type>::_Ret _Type; |
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static _Type _Ret() { return _Type(); } |
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}; |
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|
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// we make general case dependant on the fact the type is actually a pointer. |
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|
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template <class _Tp> |
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struct __type_traits : __type_traits_aux<_IsPtr<_Tp>::_Ret> {}; |
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# else |
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|
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template <class _Tp> |
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struct __type_traits { |
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typedef __true_type this_dummy_member_must_be_first; |
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/* Do not remove this member. It informs a compiler which |
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automatically specializes __type_traits that this |
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__type_traits template is special. It just makes sure that |
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things work if an implementation is using a template |
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called __type_traits for something unrelated. */ |
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|
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/* The following restrictions should be observed for the sake of |
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compilers which automatically produce type specific specializations |
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of this class: |
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- You may reorder the members below if you wish |
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- You may remove any of the members below if you wish |
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- You must not rename members without making the corresponding |
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name change in the compiler |
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- Members you add will be treated like regular members unless |
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you add the appropriate support in the compiler. */ |
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typedef __false_type has_trivial_default_constructor; |
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typedef __false_type has_trivial_copy_constructor; |
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typedef __false_type has_trivial_assignment_operator; |
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typedef __false_type has_trivial_destructor; |
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typedef __false_type is_POD_type; |
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}; |
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template <class _Tp> struct _IsPtr { enum { _Ret = 0 }; }; |
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template <class _Tp> struct _IsPtrType { |
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static __false_type _Ret() { return __false_type();} |
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}; |
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template <class _Tp1, class _Tp2> struct _BothPtrType { |
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static __false_type _Ret() { return __false_type();} |
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}; |
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template <class _Tp1, class _Tp2> |
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struct _IsSame { enum { _Ret = 0 }; }; |
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// template <class _Tp1, class _Tp2> |
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// struct _IsSameType { static __false_type _Ret() { return __false_type(); } }; |
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# ifdef _STLP_CLASS_PARTIAL_SPECIALIZATION |
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template <class _Tp> struct _IsPtr<_Tp*> { enum { _Ret = 1 }; }; |
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template <class _Tp> struct _IsPtrType<_Tp*> { |
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static __true_type _Ret() { return __true_type();} |
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}; |
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template <class _Tp1, class _Tp2> struct _BothPtrType<_Tp1*, _Tp2*> { |
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static __true_type _Ret() { return __true_type();} |
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}; |
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template <class _Tp> |
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struct _IsSame<_Tp, _Tp> { enum { _Ret = 1 }; }; |
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# endif |
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# endif /* _STLP_SIMULATE_PARTIAL_SPEC_FOR_TYPE_TRAITS */ |
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// Provide some specializations. This is harmless for compilers that |
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// have built-in __types_traits support, and essential for compilers |
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// that don't. |
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#ifndef _STLP_NO_BOOL |
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_STLP_TEMPLATE_NULL struct __type_traits<bool> : __type_traits_aux<1> {}; |
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#endif /* _STLP_NO_BOOL */ |
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_STLP_TEMPLATE_NULL struct __type_traits<char> : __type_traits_aux<1> {}; |
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#ifndef _STLP_NO_SIGNED_BUILTINS |
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_STLP_TEMPLATE_NULL struct __type_traits<signed char> : __type_traits_aux<1> {}; |
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# endif |
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_STLP_TEMPLATE_NULL struct __type_traits<unsigned char> : __type_traits_aux<1> {}; |
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#if defined ( _STLP_HAS_WCHAR_T ) && ! defined (_STLP_WCHAR_T_IS_USHORT) |
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_STLP_TEMPLATE_NULL struct __type_traits<wchar_t> : __type_traits_aux<1> {}; |
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#endif /* _STLP_HAS_WCHAR_T */ |
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_STLP_TEMPLATE_NULL struct __type_traits<short> : __type_traits_aux<1> {}; |
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_STLP_TEMPLATE_NULL struct __type_traits<unsigned short> : __type_traits_aux<1> {}; |
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_STLP_TEMPLATE_NULL struct __type_traits<int> : __type_traits_aux<1> {}; |
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_STLP_TEMPLATE_NULL struct __type_traits<unsigned int> : __type_traits_aux<1> {}; |
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_STLP_TEMPLATE_NULL struct __type_traits<long> : __type_traits_aux<1> {}; |
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_STLP_TEMPLATE_NULL struct __type_traits<unsigned long> : __type_traits_aux<1> {}; |
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#ifdef _STLP_LONG_LONG |
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_STLP_TEMPLATE_NULL struct __type_traits<_STLP_LONG_LONG> : __type_traits_aux<1> {}; |
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_STLP_TEMPLATE_NULL struct __type_traits<unsigned _STLP_LONG_LONG> : __type_traits_aux<1> {}; |
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#endif /* _STLP_LONG_LONG */ |
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_STLP_TEMPLATE_NULL struct __type_traits<float> : __type_traits_aux<1> {}; |
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_STLP_TEMPLATE_NULL struct __type_traits<double> : __type_traits_aux<1> {}; |
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# if !defined ( _STLP_NO_LONG_DOUBLE ) |
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_STLP_TEMPLATE_NULL struct __type_traits<long double> : __type_traits_aux<1> {}; |
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# endif |
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#ifdef _STLP_CLASS_PARTIAL_SPECIALIZATION |
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template <class _Tp> struct __type_traits<_Tp*> : __type_traits_aux<1> {}; |
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#endif |
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// The following could be written in terms of numeric_limits. |
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// We're doing it separately to reduce the number of dependencies. |
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template <class _Tp> struct _Is_integer { |
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typedef __false_type _Integral; |
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}; |
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#ifndef _STLP_NO_BOOL |
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_STLP_TEMPLATE_NULL struct _Is_integer<bool> { |
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typedef __true_type _Integral; |
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}; |
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#endif /* _STLP_NO_BOOL */ |
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_STLP_TEMPLATE_NULL struct _Is_integer<char> { |
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typedef __true_type _Integral; |
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}; |
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#ifndef _STLP_NO_SIGNED_BUILTINS |
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_STLP_TEMPLATE_NULL struct _Is_integer<signed char> { |
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typedef __true_type _Integral; |
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}; |
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#endif |
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_STLP_TEMPLATE_NULL struct _Is_integer<unsigned char> { |
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typedef __true_type _Integral; |
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}; |
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#if defined ( _STLP_HAS_WCHAR_T ) && ! defined (_STLP_WCHAR_T_IS_USHORT) |
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_STLP_TEMPLATE_NULL struct _Is_integer<wchar_t> { |
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typedef __true_type _Integral; |
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}; |
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#endif /* _STLP_HAS_WCHAR_T */ |
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_STLP_TEMPLATE_NULL struct _Is_integer<short> { |
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typedef __true_type _Integral; |
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}; |
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_STLP_TEMPLATE_NULL struct _Is_integer<unsigned short> { |
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typedef __true_type _Integral; |
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}; |
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_STLP_TEMPLATE_NULL struct _Is_integer<int> { |
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typedef __true_type _Integral; |
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}; |
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_STLP_TEMPLATE_NULL struct _Is_integer<unsigned int> { |
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typedef __true_type _Integral; |
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}; |
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_STLP_TEMPLATE_NULL struct _Is_integer<long> { |
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typedef __true_type _Integral; |
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}; |
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_STLP_TEMPLATE_NULL struct _Is_integer<unsigned long> { |
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typedef __true_type _Integral; |
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}; |
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#ifdef _STLP_LONG_LONG |
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_STLP_TEMPLATE_NULL struct _Is_integer<_STLP_LONG_LONG> { |
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typedef __true_type _Integral; |
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}; |
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_STLP_TEMPLATE_NULL struct _Is_integer<unsigned _STLP_LONG_LONG> { |
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typedef __true_type _Integral; |
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}; |
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#endif /* _STLP_LONG_LONG */ |
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template <class _Tp1, class _Tp2> |
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struct _OKToMemCpy { |
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enum { _Same = _IsSame<_Tp1,_Tp2>::_Ret } ; |
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typedef typename __type_traits<_Tp1>::has_trivial_assignment_operator _Tr1; |
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typedef typename __type_traits<_Tp2>::has_trivial_assignment_operator _Tr2; |
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typedef typename __bool2type< _Same >::_Ret _Tr3; |
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typedef typename _Land3<_Tr1, _Tr2, _Tr3>::_Ret _Type; |
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static _Type _Ret() { return _Type(); } |
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}; |
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template <class _Tp1, class _Tp2> |
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inline _OKToMemCpy<_Tp1, _Tp2> _IsOKToMemCpy(_Tp1*, _Tp2*) { |
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return _OKToMemCpy<_Tp1, _Tp2>(); |
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} |
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template <class _Tp> |
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struct _IsPOD { |
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typedef typename __type_traits<_Tp>::is_POD_type _Type; |
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static _Type _Ret() { return _Type(); } |
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}; |
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template <class _Tp> |
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inline _IsPOD<_Tp> _Is_POD (_Tp*) { return _IsPOD<_Tp>(); } |
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# ifdef _STLP_CLASS_PARTIAL_SPECIALIZATION |
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# if defined (__BORLANDC__) || defined (__SUNPRO_CC) || ( defined (__MWERKS__) && (__MWERKS__ <= 0x2303)) || ( defined (__sgi) && defined (_COMPILER_VERSION)) || defined (__DMC__) |
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# define _IS_POD_ITER(_It, _Tp) __type_traits< typename iterator_traits< _Tp >::value_type >::is_POD_type() |
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# else |
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# define _IS_POD_ITER(_It, _Tp) typename __type_traits< typename iterator_traits< _Tp >::value_type >::is_POD_type() |
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# endif |
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# else |
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# define _IS_POD_ITER(_It, _Tp) _Is_POD( _STLP_VALUE_TYPE( _It, _Tp ) )._Ret() |
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# endif |
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# ifdef _STLP_DEFAULT_CONSTRUCTOR_BUG |
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// Those adaptors are here to fix common compiler bug regarding builtins: |
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// expressions like int k = int() should initialize k to 0 |
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template <class _Tp> |
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inline _Tp __default_constructed_aux(_Tp*, const __false_type&) { |
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return _Tp(); |
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} |
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template <class _Tp> |
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inline _Tp __default_constructed_aux(_Tp*, const __true_type&) { |
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return _Tp(0); |
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} |
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|
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template <class _Tp> |
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inline _Tp __default_constructed(_Tp* __p) { |
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typedef typename _Is_integer<_Tp>::_Integral _Is_Integral; |
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return __default_constructed_aux(__p, _Is_Integral()); |
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} |
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|
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# define _STLP_DEFAULT_CONSTRUCTED(_TTp) __default_constructed((_TTp*)0) |
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# else |
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# define _STLP_DEFAULT_CONSTRUCTED(_TTp) _TTp() |
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# endif |
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_STLP_END_NAMESPACE |
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#endif /* __TYPE_TRAITS_H */ |
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// Local Variables: |
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// mode:C++ |
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// End: |
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