forked from boostorg/iterator
Split iterator_adaptors.hpp in multiple headers.
[SVN r1040]
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Thomas Witt committed
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@@ -9,9 +9,12 @@
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#include <boost/config.hpp>
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#include <boost/detail/workaround.hpp>
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#include <boost/type_traits/conversion_traits.hpp>
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#include <boost/type_traits/is_base_and_derived.hpp>
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#include <boost/type_traits/is_convertible.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/bool_c.hpp>
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#include <boost/mpl/logical/or.hpp>
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#include <iterator>
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#if BOOST_WORKAROUND(__MWERKS__, <=0x2407)
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@@ -207,7 +210,7 @@ namespace boost {
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//
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// The nested is_category template class are used for
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// minimum category detection in iterator_adaptors.
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// They are basically a pore mans is_derived replacement.
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// They are basically a poore mans is_derived replacement.
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//
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// A implementation may look like this
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//
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@@ -392,6 +395,70 @@ namespace boost {
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#endif
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//
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// I bet this is defined somewhere else. Let's wait and see.
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//
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struct error_type;
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#ifdef BOOST_NO_IS_CONVERTIBLE
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template <class Cat1, class Cat2>
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struct minimum_return_category
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: mpl::if_< is_return_category< Cat1 >::template is_category< Cat2 >,
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Cat1,
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mpl::if_< is_return_category<Cat2>::template is_category<Cat1>,
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Cat2,
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error_type
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>
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> {};
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template <class Cat1, class Cat2>
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struct minimum_traversal_category
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: mpl::if_< is_traversal_category< Cat1 >::template is_category< Cat2 >,
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Cat1,
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mpl::if_< is_traversal_category<Cat2>::template is_category<Cat1>,
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Cat2,
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error_type
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>
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> {};
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template <class T1, class T2>
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struct minimum_category_select
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: mpl::if_< is_same< typename T1::type, error_type >,
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T2,
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T1 >
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{};
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#endif
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template <class Base, class Derived>
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struct is_base_or_same :
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mpl::logical_or< is_same< Base, Derived >,
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is_base_and_derived< Base, Derived > >
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{};
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//
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// Returns the minimum category type or error_type
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// if T1 and T2 are unrelated.
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//
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// For compilers not supporting is_convertible this only
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// works with the new boost return and traversal category
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// types. The exect boost _types_ are required. No derived types
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// will work.
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//
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//
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template <class T1, class T2>
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struct minimum_category :
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#ifndef BOOST_NO_IS_CONVERTIBLE
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mpl::if_< is_base_or_same< T1, T2 >,
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T1,
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mpl::if_< is_base_or_same< T2, T1 >,
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T2,
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error_type > >
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#else
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minimum_category_select< minimum_return_category<T1, T2>,
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minimum_traversal_category<T1, T2> >
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#endif
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{};
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} // namespace detail
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} // namespace boost
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@@ -0,0 +1,43 @@
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// (C) Copyright David Abrahams 2002.
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// (C) Copyright Jeremy Siek 2002.
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// (C) Copyright Thomas Witt 2002.
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// Permission to copy, use, modify,
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// sell and distribute this software is granted provided this
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// copyright notice appears in all copies. This software is provided
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// "as is" without express or implied warranty, and with no claim as
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// to its suitability for any purpose.
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// no include guard multiple inclusion intended
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//
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// This is a temporary workaround until the bulk of this is
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// available in boost config.
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// 23/02/03 thw
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//
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#include <boost/config.hpp> // for prior
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#include <boost/detail/workaround.hpp>
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#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) \
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|| BOOST_WORKAROUND(__GNUC__, <= 2 && __GNUC_MINOR__ <= 95) \
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|| BOOST_WORKAROUND(__MWERKS__, <= 0x3000)
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# define BOOST_NO_SFINAE // "Substitution Failure Is Not An Error not implemented"
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#endif
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#if BOOST_WORKAROUND(BOOST_MSVC, <=1200)
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# define BOOST_ARG_DEP_TYPENAME
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#else
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# define BOOST_ARG_DEP_TYPENAME typename
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#endif
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#if BOOST_WORKAROUND(__MWERKS__, <=0x2407)
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# define BOOST_NO_IS_CONVERTIBLE // "is_convertible doesn't always work"
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#endif
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#if BOOST_WORKAROUND(__GNUC__, == 2 && __GNUC_MINOR__ == 95) \
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|| BOOST_WORKAROUND(__MWERKS__, <= 0x2407) \
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|| BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
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# define BOOST_NO_MPL_AUX_HAS_XXX // "MPL's has_xxx facility doesn't work"
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#endif
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// no include guard multiple inclusion intended
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@@ -0,0 +1,20 @@
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// (C) Copyright Thomas Witt 2002.
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// Permission to copy, use, modify,
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// sell and distribute this software is granted provided this
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// copyright notice appears in all copies. This software is provided
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// "as is" without express or implied warranty, and with no claim as
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// to its suitability for any purpose.
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// no include guard multiple inclusion intended
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//
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// This is a temporary workaround until the bulk of this is
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// available in boost config.
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// 23/02/03 thw
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//
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# undef BOOST_NO_SFINAE
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# undef BOOST_ARG_DEP_TYPENAME
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# undef BOOST_NO_IS_CONVERTIBLE
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# undef BOOST_NO_MPL_AUX_HAS_XXX
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@@ -0,0 +1,88 @@
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// (C) Copyright David Abrahams 2002.
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// (C) Copyright Jeremy Siek 2002.
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// (C) Copyright Thomas Witt 2002.
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// Permission to copy, use, modify,
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// sell and distribute this software is granted provided this
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// copyright notice appears in all copies. This software is provided
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// "as is" without express or implied warranty, and with no claim as
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// to its suitability for any purpose.
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#ifndef BOOST_ENABLE_IF_23022003THW_HPP
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#define BOOST_ENABLE_IF_23022003THW_HPP
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#include <boost/detail/workaround.hpp>
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#include <boost/mpl/identity.hpp>
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#include <boost/iterator/detail/config_def.hpp>
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//
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// Boost iterators uses its own enable_if cause we need
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// special semantics for deficient compilers.
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// 23/02/03 thw
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//
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namespace boost
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{
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namespace detail
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{
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//
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// Base machinery for all kinds of enable if
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//
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template<bool>
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struct enabled
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{
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template<typename T>
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struct base
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{
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typedef T type;
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};
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};
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//
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// For compilers that don't support "Substitution Failure Is Not An Error"
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// enable_if falls back to always enabled. See comments
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// on operator implementation for consequences.
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//
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template<>
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struct enabled<false>
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{
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template<typename T>
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struct base
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{
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#ifdef BOOST_NO_SFINAE
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typedef T type;
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// This way to do it would give a nice error message containing
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// invalid overload, but has the big disadvantage that
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// there is no reference to user code in the error message.
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//
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// struct invalid_overload;
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// typedef invalid_overload type;
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//
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#endif
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};
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};
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template <class Cond,
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class Return>
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struct enable_if
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# if !defined(BOOST_NO_SFINAE) && !defined(BOOST_NO_IS_CONVERTIBLE)
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: enabled<Cond::value>::template base<Return>
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# else
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: mpl::identity<Return>
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# endif
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{
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# if BOOST_WORKAROUND(BOOST_MSVC, <= 1200)
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typedef Return type;
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# endif
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};
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} // namespace detail
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} // namespace boost
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#include <boost/iterator/detail/config_undef.hpp>
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#endif // BOOST_ENABLE_IF_23022003THW_HPP
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