88 lines
2.8 KiB
C++
88 lines
2.8 KiB
C++
/*-----------------------------------------------------------------------------+
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Copyright (c) 2010-2010: Joachim Faulhaber
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+------------------------------------------------------------------------------+
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENCE.txt or copy at
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http://www.boost.org/LICENSE_1_0.txt)
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+-----------------------------------------------------------------------------*/
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#ifndef BOOST_ICL_CONCEPT_CONTAINER_HPP_JOFA_100923
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#define BOOST_ICL_CONCEPT_CONTAINER_HPP_JOFA_100923
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#include <boost/utility/enable_if.hpp>
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#include <boost/mpl/and.hpp>
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#include <boost/mpl/not.hpp>
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#include <boost/icl/type_traits/is_container.hpp>
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#include <boost/icl/type_traits/is_icl_container.hpp>
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namespace boost{ namespace icl
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{
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//==============================================================================
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//= Emptieness
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//==============================================================================
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/** Tests if the container is empty.
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Complexity: constant. */
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template<class Type>
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typename enable_if<is_container<Type>, bool>::type
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is_empty(const Type& object)
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{
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return object.begin()==object.end();
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}
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/** All content of the container is dropped.
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Complexity: linear. */
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template<class Type>
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typename enable_if<is_container<Type>, void>::type
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clear(Type& object)
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{
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object.erase(object.begin(), object.end());
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}
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//==============================================================================
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//= Size
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//==============================================================================
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template<class Type>
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typename enable_if<mpl::and_< is_container<Type>
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, mpl::not_<is_icl_container<Type> > >
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, std::size_t>::type
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iterative_size(const Type& object)
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{
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return object.size();
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}
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//==============================================================================
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//= Swap
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//==============================================================================
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template<class Type>
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typename enable_if<is_container<Type>, void>::type
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swap(Type& left, Type& right)
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{
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left.swap(right);
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}
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//==============================================================================
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//= Iteration
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//==============================================================================
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template<class Type>
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typename enable_if<is_container<Type>, typename Type::iterator>::type
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cyclic_prior(Type& object, typename Type::iterator it_)
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{ return it_ == object.begin() ? object.end() : --it_; }
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template<class Type>
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typename enable_if<is_container<Type>, typename Type::const_iterator>::type
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cyclic_prior(const Type& object, typename Type::const_iterator it_)
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{ return it_ == object.begin() ? object.end() : --it_; }
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}} // namespace boost icl
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#endif
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