boost/foreach
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make foreach work with collection types that are abstract

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[SVN r33906]
This commit is contained in:
Eric Niebler
2006-05-02 14:37:54 +00:00
parent c7002b3113
commit 12652dac2b
1 changed files with 13 additions and 2 deletions
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15
include/boost/foreach.hpp
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@@ -69,6 +69,7 @@
#include <boost/range/result_iterator.hpp>
#include <boost/type_traits/is_array.hpp>
#include <boost/type_traits/is_const.hpp>
#include <boost/type_traits/is_abstract.hpp>
#include <boost/type_traits/is_base_and_derived.hpp>
#include <boost/iterator/iterator_traits.hpp>
#include <boost/utility/addressof.hpp>
@@ -129,8 +130,15 @@ namespace foreach
// This also tells BOOST_FOREACH to avoid the rvalue/lvalue detection stuff.
template<typename T>
struct is_noncopyable
#ifndef BOOST_BROKEN_IS_BASE_AND_DERIVED
#if !defined(BOOST_BROKEN_IS_BASE_AND_DERIVED) && !defined(BOOST_NO_IS_ABSTRACT)
: boost::mpl::or_<
boost::is_abstract<T>
, boost::is_base_and_derived<boost::noncopyable, T>
>
#elif !defined(BOOST_BROKEN_IS_BASE_AND_DERIVED)
: boost::is_base_and_derived<boost::noncopyable, T>
#elif !defined(BOOST_NO_IS_ABSTRACT)
: boost::is_abstract<T>
#else
: boost::mpl::false_
#endif
@@ -356,8 +364,11 @@ inline T &derefof(T *t)
template<typename T>
struct rvalue_probe
{
struct private_type_ {};
// can't ever return an array by value
typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_<boost::is_array<T>, int, T>::type value_type;
typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_<
boost::mpl::or_<boost::is_abstract<T>, boost::is_array<T> >, private_type_, T
>::type value_type;
operator value_type();
operator T &() const;
};