author | Jon Chatten |
Thu, 10 Dec 2009 15:35:48 +0000 | |
branch | wip |
changeset 61 | f520dfd22025 |
parent 0 | 044383f39525 |
permissions | -rw-r--r-- |
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// (C) Copyright David Abrahams 2002. |
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// Distributed under the Boost Software License, Version 1.0. (See |
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// accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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|
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// Boost versions of |
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// |
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// std::iterator_traits<>::iterator_category |
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// std::iterator_traits<>::difference_type |
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// std::distance() |
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// |
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// ...for all compilers and iterators |
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// |
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// Additionally, if X is a pointer |
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// std::iterator_traits<X>::pointer |
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// Otherwise, if partial specialization is supported or X is not a pointer |
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// std::iterator_traits<X>::value_type |
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// std::iterator_traits<X>::pointer |
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// std::iterator_traits<X>::reference |
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// |
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// See http://www.boost.org for most recent version including documentation. |
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// Revision History |
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// 04 Mar 2001 - More attempted fixes for Intel C++ (David Abrahams) |
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// 03 Mar 2001 - Put all implementation into namespace |
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// boost::detail::iterator_traits_. Some progress made on fixes |
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// for Intel compiler. (David Abrahams) |
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// 02 Mar 2001 - Changed BOOST_MSVC to BOOST_MSVC_STD_ITERATOR in a few |
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// places. (Jeremy Siek) |
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// 19 Feb 2001 - Improved workarounds for stock MSVC6; use yes_type and |
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// no_type from type_traits.hpp; stopped trying to remove_cv |
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// before detecting is_pointer, in honor of the new type_traits |
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// semantics. (David Abrahams) |
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// 13 Feb 2001 - Make it work with nearly all standard-conforming iterators |
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// under raw VC6. The one category remaining which will fail is |
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// that of iterators derived from std::iterator but not |
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// boost::iterator and which redefine difference_type. |
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// 11 Feb 2001 - Clean away code which can never be used (David Abrahams) |
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// 09 Feb 2001 - Always have a definition for each traits member, even if it |
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// can't be properly deduced. These will be incomplete types in |
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// some cases (undefined<void>), but it helps suppress MSVC errors |
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// elsewhere (David Abrahams) |
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// 07 Feb 2001 - Support for more of the traits members where possible, making |
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// this useful as a replacement for std::iterator_traits<T> when |
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// used as a default template parameter. |
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// 06 Feb 2001 - Removed useless #includes of standard library headers |
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// (David Abrahams) |
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#ifndef ITERATOR_DWA122600_HPP_ |
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# define ITERATOR_DWA122600_HPP_ |
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# include <boost/config.hpp> |
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# include <iterator> |
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// STLPort 4.0 and betas have a bug when debugging is enabled and there is no |
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// partial specialization: instead of an iterator_category typedef, the standard |
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// container iterators have _Iterator_category. |
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// |
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// Also, whether debugging is enabled or not, there is a broken specialization |
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// of std::iterator<output_iterator_tag,void,void,void,void> which has no |
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// typedefs but iterator_category. |
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# if defined(__SGI_STL_PORT) |
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# if (__SGI_STL_PORT <= 0x410) && !defined(__STL_CLASS_PARTIAL_SPECIALIZATION) && defined(__STL_DEBUG) |
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# define BOOST_BAD_CONTAINER_ITERATOR_CATEGORY_TYPEDEF |
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# endif |
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# define BOOST_BAD_OUTPUT_ITERATOR_SPECIALIZATION |
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# endif // STLPort <= 4.1b4 && no partial specialization |
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# if !defined(BOOST_NO_STD_ITERATOR_TRAITS) \ |
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&& !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) \ |
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&& !defined(BOOST_MSVC_STD_ITERATOR) |
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namespace boost { namespace detail { |
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// Define a new template so it can be specialized |
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template <class Iterator> |
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struct iterator_traits |
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: std::iterator_traits<Iterator> |
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{}; |
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using std::distance; |
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}} // namespace boost::detail |
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# else |
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# if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) \ |
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&& !defined(BOOST_MSVC_STD_ITERATOR) |
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// This is the case where everything conforms except BOOST_NO_STD_ITERATOR_TRAITS |
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namespace boost { namespace detail { |
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// Rogue Wave Standard Library fools itself into thinking partial |
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// specialization is missing on some platforms (e.g. Sun), so fails to |
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// supply iterator_traits! |
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template <class Iterator> |
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struct iterator_traits |
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{ |
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typedef typename Iterator::value_type value_type; |
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typedef typename Iterator::reference reference; |
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typedef typename Iterator::pointer pointer; |
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typedef typename Iterator::difference_type difference_type; |
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typedef typename Iterator::iterator_category iterator_category; |
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}; |
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template <class T> |
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struct iterator_traits<T*> |
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{ |
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typedef T value_type; |
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typedef T& reference; |
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typedef T* pointer; |
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typedef std::ptrdiff_t difference_type; |
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typedef std::random_access_iterator_tag iterator_category; |
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}; |
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template <class T> |
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struct iterator_traits<T const*> |
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{ |
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typedef T value_type; |
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typedef T const& reference; |
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typedef T const* pointer; |
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typedef std::ptrdiff_t difference_type; |
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typedef std::random_access_iterator_tag iterator_category; |
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}; |
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}} // namespace boost::detail |
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# else |
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# include <boost/type_traits/remove_const.hpp> |
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# include <boost/type_traits/detail/yes_no_type.hpp> |
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# include <boost/type_traits/is_pointer.hpp> |
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# ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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# include <boost/type_traits/is_same.hpp> |
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# include <boost/type_traits/remove_pointer.hpp> |
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# endif |
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# ifdef BOOST_BAD_OUTPUT_ITERATOR_SPECIALIZATION |
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# include <boost/type_traits/is_base_and_derived.hpp> |
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# endif |
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# include <boost/mpl/if.hpp> |
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# include <boost/mpl/has_xxx.hpp> |
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# include <cstddef> |
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// should be the last #include |
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# include "boost/type_traits/detail/bool_trait_def.hpp" |
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namespace boost { namespace detail { |
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BOOST_MPL_HAS_XXX_TRAIT_DEF(value_type) |
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BOOST_MPL_HAS_XXX_TRAIT_DEF(reference) |
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BOOST_MPL_HAS_XXX_TRAIT_DEF(pointer) |
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BOOST_MPL_HAS_XXX_TRAIT_DEF(difference_type) |
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BOOST_MPL_HAS_XXX_TRAIT_DEF(iterator_category) |
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// is_mutable_iterator -- |
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// |
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// A metafunction returning true iff T is a mutable iterator type |
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// with a nested value_type. Will only work portably with iterators |
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// whose operator* returns a reference, but that seems to be OK for |
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// the iterators supplied by Dinkumware. Some input iterators may |
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// compile-time if they arrive here, and if the compiler is strict |
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// about not taking the address of an rvalue. |
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169 |
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// This one detects ordinary mutable iterators - the result of |
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// operator* is convertible to the value_type. |
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172 |
template <class T> |
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type_traits::yes_type is_mutable_iterator_helper(T const*, BOOST_DEDUCED_TYPENAME T::value_type*); |
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174 |
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// Since you can't take the address of an rvalue, the guts of |
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// is_mutable_iterator_impl will fail if we use &*t directly. This |
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// makes sure we can still work with non-lvalue iterators. |
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template <class T> T* mutable_iterator_lvalue_helper(T& x); |
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int mutable_iterator_lvalue_helper(...); |
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180 |
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181 |
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// This one detects output iterators such as ostream_iterator which |
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// return references to themselves. |
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184 |
template <class T> |
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type_traits::yes_type is_mutable_iterator_helper(T const*, T const*); |
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186 |
|
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type_traits::no_type is_mutable_iterator_helper(...); |
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188 |
|
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189 |
template <class T> |
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190 |
struct is_mutable_iterator_impl |
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191 |
{ |
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192 |
static T t; |
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193 |
|
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194 |
BOOST_STATIC_CONSTANT( |
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195 |
bool, value = sizeof( |
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196 |
detail::is_mutable_iterator_helper( |
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197 |
(T*)0 |
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, mutable_iterator_lvalue_helper(*t) // like &*t |
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199 |
)) |
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== sizeof(type_traits::yes_type) |
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201 |
); |
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202 |
}; |
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203 |
|
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204 |
BOOST_TT_AUX_BOOL_TRAIT_DEF1( |
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is_mutable_iterator,T,::boost::detail::is_mutable_iterator_impl<T>::value) |
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206 |
|
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207 |
|
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208 |
// is_full_iterator_traits -- |
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209 |
// |
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210 |
// A metafunction returning true iff T has all the requisite nested |
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211 |
// types to satisfy the requirements for a fully-conforming |
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212 |
// iterator_traits implementation. |
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213 |
template <class T> |
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214 |
struct is_full_iterator_traits_impl |
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215 |
{ |
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216 |
enum { value = |
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217 |
has_value_type<T>::value |
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218 |
& has_reference<T>::value |
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219 |
& has_pointer<T>::value |
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& has_difference_type<T>::value |
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221 |
& has_iterator_category<T>::value |
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222 |
}; |
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223 |
}; |
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224 |
|
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225 |
BOOST_TT_AUX_BOOL_TRAIT_DEF1( |
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226 |
is_full_iterator_traits,T,::boost::detail::is_full_iterator_traits_impl<T>::value) |
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227 |
|
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228 |
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229 |
# ifdef BOOST_BAD_CONTAINER_ITERATOR_CATEGORY_TYPEDEF |
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BOOST_MPL_HAS_XXX_TRAIT_DEF(_Iterator_category) |
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231 |
|
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// is_stlport_40_debug_iterator -- |
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233 |
// |
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// A metafunction returning true iff T has all the requisite nested |
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// types to satisfy the requirements of an STLPort 4.0 debug iterator |
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236 |
// iterator_traits implementation. |
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237 |
template <class T> |
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238 |
struct is_stlport_40_debug_iterator_impl |
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239 |
{ |
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240 |
enum { value = |
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241 |
has_value_type<T>::value |
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242 |
& has_reference<T>::value |
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243 |
& has_pointer<T>::value |
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244 |
& has_difference_type<T>::value |
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245 |
& has__Iterator_category<T>::value |
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246 |
}; |
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247 |
}; |
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248 |
|
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249 |
BOOST_TT_AUX_BOOL_TRAIT_DEF1( |
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250 |
is_stlport_40_debug_iterator,T,::boost::detail::is_stlport_40_debug_iterator_impl<T>::value) |
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251 |
|
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252 |
template <class T> |
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253 |
struct stlport_40_debug_iterator_traits |
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254 |
{ |
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255 |
typedef typename T::value_type value_type; |
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256 |
typedef typename T::reference reference; |
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257 |
typedef typename T::pointer pointer; |
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typedef typename T::difference_type difference_type; |
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typedef typename T::_Iterator_category iterator_category; |
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260 |
}; |
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# endif // BOOST_BAD_CONTAINER_ITERATOR_CATEGORY_TYPEDEF |
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262 |
|
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template <class T> struct pointer_iterator_traits; |
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264 |
|
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# ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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template <class T> |
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267 |
struct pointer_iterator_traits<T*> |
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268 |
{ |
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typedef typename remove_const<T>::type value_type; |
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typedef T* pointer; |
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typedef T& reference; |
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typedef std::random_access_iterator_tag iterator_category; |
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typedef std::ptrdiff_t difference_type; |
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274 |
}; |
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275 |
# else |
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276 |
|
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// In case of no template partial specialization, and if T is a |
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// pointer, iterator_traits<T>::value_type can still be computed. For |
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// some basic types, remove_pointer is manually defined in |
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// type_traits/broken_compiler_spec.hpp. For others, do it yourself. |
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281 |
|
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template<class P> class please_invoke_BOOST_TT_BROKEN_COMPILER_SPEC_on_cv_unqualified_pointee; |
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283 |
|
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284 |
template<class P> |
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285 |
struct pointer_value_type |
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286 |
: mpl::if_< |
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is_same<P, typename remove_pointer<P>::type> |
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, please_invoke_BOOST_TT_BROKEN_COMPILER_SPEC_on_cv_unqualified_pointee<P> |
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289 |
, typename remove_const< |
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290 |
typename remove_pointer<P>::type |
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291 |
>::type |
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292 |
> |
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293 |
{ |
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294 |
}; |
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295 |
|
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296 |
|
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297 |
template<class P> |
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298 |
struct pointer_reference |
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299 |
: mpl::if_< |
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300 |
is_same<P, typename remove_pointer<P>::type> |
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301 |
, please_invoke_BOOST_TT_BROKEN_COMPILER_SPEC_on_cv_unqualified_pointee<P> |
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302 |
, typename remove_pointer<P>::type& |
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303 |
> |
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304 |
{ |
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305 |
}; |
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306 |
|
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307 |
template <class T> |
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308 |
struct pointer_iterator_traits |
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309 |
{ |
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310 |
typedef T pointer; |
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311 |
typedef std::random_access_iterator_tag iterator_category; |
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312 |
typedef std::ptrdiff_t difference_type; |
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313 |
|
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314 |
typedef typename pointer_value_type<T>::type value_type; |
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315 |
typedef typename pointer_reference<T>::type reference; |
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316 |
}; |
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317 |
|
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318 |
# endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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319 |
|
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320 |
// We'll sort iterator types into one of these classifications, from which we |
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321 |
// can determine the difference_type, pointer, reference, and value_type |
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322 |
template <class Iterator> |
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323 |
struct standard_iterator_traits |
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324 |
{ |
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325 |
typedef typename Iterator::difference_type difference_type; |
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326 |
typedef typename Iterator::value_type value_type; |
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327 |
typedef typename Iterator::pointer pointer; |
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328 |
typedef typename Iterator::reference reference; |
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329 |
typedef typename Iterator::iterator_category iterator_category; |
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330 |
}; |
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331 |
|
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332 |
template <class Iterator> |
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333 |
struct msvc_stdlib_mutable_traits |
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334 |
: std::iterator_traits<Iterator> |
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335 |
{ |
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336 |
typedef typename std::iterator_traits<Iterator>::distance_type difference_type; |
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337 |
typedef typename std::iterator_traits<Iterator>::value_type* pointer; |
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338 |
typedef typename std::iterator_traits<Iterator>::value_type& reference; |
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339 |
}; |
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340 |
|
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341 |
template <class Iterator> |
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342 |
struct msvc_stdlib_const_traits |
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343 |
: std::iterator_traits<Iterator> |
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344 |
{ |
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345 |
typedef typename std::iterator_traits<Iterator>::distance_type difference_type; |
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346 |
typedef const typename std::iterator_traits<Iterator>::value_type* pointer; |
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347 |
typedef const typename std::iterator_traits<Iterator>::value_type& reference; |
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348 |
}; |
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349 |
|
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350 |
# ifdef BOOST_BAD_OUTPUT_ITERATOR_SPECIALIZATION |
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351 |
template <class Iterator> |
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352 |
struct is_bad_output_iterator |
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353 |
: is_base_and_derived< |
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354 |
std::iterator<std::output_iterator_tag,void,void,void,void> |
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355 |
, Iterator> |
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356 |
{ |
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357 |
}; |
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358 |
|
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359 |
struct bad_output_iterator_traits |
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360 |
{ |
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361 |
typedef void value_type; |
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362 |
typedef void difference_type; |
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363 |
typedef std::output_iterator_tag iterator_category; |
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364 |
typedef void pointer; |
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365 |
typedef void reference; |
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366 |
}; |
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367 |
# endif |
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368 |
|
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369 |
// If we're looking at an MSVC6 (old Dinkumware) ``standard'' |
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370 |
// iterator, this will generate an appropriate traits class. |
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371 |
template <class Iterator> |
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372 |
struct msvc_stdlib_iterator_traits |
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373 |
: mpl::if_< |
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374 |
is_mutable_iterator<Iterator> |
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375 |
, msvc_stdlib_mutable_traits<Iterator> |
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376 |
, msvc_stdlib_const_traits<Iterator> |
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377 |
>::type |
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378 |
{}; |
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379 |
|
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380 |
template <class Iterator> |
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381 |
struct non_pointer_iterator_traits |
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382 |
: mpl::if_< |
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383 |
// if the iterator contains all the right nested types... |
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|
384 |
is_full_iterator_traits<Iterator> |
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385 |
// Use a standard iterator_traits implementation |
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386 |
, standard_iterator_traits<Iterator> |
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387 |
# ifdef BOOST_BAD_CONTAINER_ITERATOR_CATEGORY_TYPEDEF |
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388 |
// Check for STLPort 4.0 broken _Iterator_category type |
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389 |
, mpl::if_< |
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390 |
is_stlport_40_debug_iterator<Iterator> |
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391 |
, stlport_40_debug_iterator_traits<Iterator> |
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|
392 |
# endif |
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393 |
// Otherwise, assume it's a Dinkum iterator |
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|
394 |
, msvc_stdlib_iterator_traits<Iterator> |
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|
395 |
# ifdef BOOST_BAD_CONTAINER_ITERATOR_CATEGORY_TYPEDEF |
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396 |
>::type |
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|
397 |
# endif |
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398 |
>::type |
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|
399 |
{ |
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|
400 |
}; |
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changeset
|
401 |
|
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|
402 |
template <class Iterator> |
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|
403 |
struct iterator_traits_aux |
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|
404 |
: mpl::if_< |
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|
405 |
is_pointer<Iterator> |
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|
406 |
, pointer_iterator_traits<Iterator> |
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|
407 |
, non_pointer_iterator_traits<Iterator> |
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|
408 |
>::type |
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changeset
|
409 |
{ |
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|
410 |
}; |
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changeset
|
411 |
|
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changeset
|
412 |
template <class Iterator> |
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|
413 |
struct iterator_traits |
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|
414 |
{ |
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|
415 |
// Explicit forwarding from base class needed to keep MSVC6 happy |
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|
416 |
// under some circumstances. |
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|
417 |
private: |
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|
418 |
# ifdef BOOST_BAD_OUTPUT_ITERATOR_SPECIALIZATION |
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|
419 |
typedef |
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|
420 |
typename mpl::if_< |
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|
421 |
is_bad_output_iterator<Iterator> |
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|
422 |
, bad_output_iterator_traits |
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|
423 |
, iterator_traits_aux<Iterator> |
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|
424 |
>::type base; |
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|
425 |
# else |
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|
426 |
typedef iterator_traits_aux<Iterator> base; |
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|
427 |
# endif |
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|
428 |
public: |
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|
429 |
typedef typename base::value_type value_type; |
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|
430 |
typedef typename base::pointer pointer; |
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|
431 |
typedef typename base::reference reference; |
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|
432 |
typedef typename base::difference_type difference_type; |
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|
433 |
typedef typename base::iterator_category iterator_category; |
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|
434 |
}; |
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changeset
|
435 |
|
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changeset
|
436 |
// This specialization cuts off ETI (Early Template Instantiation) for MSVC. |
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|
437 |
template <> struct iterator_traits<int> |
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changeset
|
438 |
{ |
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changeset
|
439 |
typedef int value_type; |
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changeset
|
440 |
typedef int pointer; |
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changeset
|
441 |
typedef int reference; |
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changeset
|
442 |
typedef int difference_type; |
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changeset
|
443 |
typedef int iterator_category; |
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changeset
|
444 |
}; |
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changeset
|
445 |
|
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changeset
|
446 |
}} // namespace boost::detail |
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|
447 |
|
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changeset
|
448 |
# endif // workarounds |
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changeset
|
449 |
|
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changeset
|
450 |
namespace boost { namespace detail { |
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|
451 |
|
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changeset
|
452 |
namespace iterator_traits_ |
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changeset
|
453 |
{ |
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changeset
|
454 |
template <class Iterator, class Difference> |
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changeset
|
455 |
struct distance_select |
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changeset
|
456 |
{ |
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changeset
|
457 |
static Difference execute(Iterator i1, const Iterator i2, ...) |
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changeset
|
458 |
{ |
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changeset
|
459 |
Difference result = 0; |
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changeset
|
460 |
while (i1 != i2) |
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changeset
|
461 |
{ |
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changeset
|
462 |
++i1; |
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changeset
|
463 |
++result; |
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changeset
|
464 |
} |
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changeset
|
465 |
return result; |
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changeset
|
466 |
} |
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changeset
|
467 |
|
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changeset
|
468 |
static Difference execute(Iterator i1, const Iterator i2, std::random_access_iterator_tag*) |
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changeset
|
469 |
{ |
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changeset
|
470 |
return i2 - i1; |
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changeset
|
471 |
} |
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changeset
|
472 |
}; |
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changeset
|
473 |
} // namespace boost::detail::iterator_traits_ |
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changeset
|
474 |
|
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changeset
|
475 |
template <class Iterator> |
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changeset
|
476 |
inline typename iterator_traits<Iterator>::difference_type |
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changeset
|
477 |
distance(Iterator first, Iterator last) |
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changeset
|
478 |
{ |
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changeset
|
479 |
typedef typename iterator_traits<Iterator>::difference_type diff_t; |
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changeset
|
480 |
typedef typename ::boost::detail::iterator_traits<Iterator>::iterator_category iterator_category; |
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changeset
|
481 |
|
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parents:
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changeset
|
482 |
return iterator_traits_::distance_select<Iterator,diff_t>::execute( |
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changeset
|
483 |
first, last, (iterator_category*)0); |
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changeset
|
484 |
} |
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parents:
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changeset
|
485 |
|
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changeset
|
486 |
}} |
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changeset
|
487 |
|
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changeset
|
488 |
# endif |
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changeset
|
489 |
|
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changeset
|
490 |
|
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changeset
|
491 |
# undef BOOST_BAD_CONTAINER_ITERATOR_CATEGORY_TYPEDEF |
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changeset
|
492 |
# undef BOOST_BAD_OUTPUT_ITERATOR_SPECIALIZATION |
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changeset
|
493 |
|
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changeset
|
494 |
#endif // ITERATOR_DWA122600_HPP_ |