118 lines
4.6 KiB
C++
118 lines
4.6 KiB
C++
// Copyright (c) 2009-2016 Vladimir Batov.
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// Use, modification and distribution are subject to the Boost Software License,
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// Version 1.0. See http://www.boost.org/LICENSE_1_0.txt.
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#ifndef BOOST_CONVERT_DETAIL_RANGE_HPP
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#define BOOST_CONVERT_DETAIL_RANGE_HPP
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#include <boost/convert/detail/has_member.hpp>
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#include <boost/convert/detail/char.hpp>
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#include <boost/utility/enable_if.hpp>
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#include <boost/range/iterator.hpp>
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namespace boost { namespace cnv
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{
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namespace detail
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{
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template<typename T, bool is_class> struct is_range : mpl::false_ {};
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template<typename T> struct is_range<T, /*is_class=*/true>
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{
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BOOST_DECLARE_HAS_MEMBER(has_begin, begin);
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BOOST_DECLARE_HAS_MEMBER( has_end, end);
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static bool const value = has_begin<T>::value && has_end<T>::value;
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};
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}
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template<typename T> struct is_range : detail::is_range<typename remove_const<T>::type, boost::is_class<T>::value> {};
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template<typename T, typename enable =void> struct range;
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template<typename T, typename enable =void> struct iterator;
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template<typename T>
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struct iterator<T, typename enable_if<is_range<T> >::type>
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{
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typedef typename boost::range_iterator<T>::type type;
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typedef typename boost::range_iterator<T const>::type const_type;
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typedef typename boost::iterator_value<type>::type value_type;
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};
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template<typename T>
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struct iterator<T*, void>
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{
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typedef typename remove_const<T>::type value_type;
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typedef T* type;
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typedef value_type const* const_type;
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};
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template<typename T>
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struct range_base
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{
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typedef typename cnv::iterator<T>::value_type value_type;
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typedef typename cnv::iterator<T>::type iterator;
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typedef typename cnv::iterator<T>::const_type const_iterator;
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typedef const_iterator sentry_type;
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iterator begin () { return begin_; }
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const_iterator begin () const { return begin_; }
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void operator++ () { ++begin_; }
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// void operator-- () { --end_; }
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protected:
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range_base (iterator b, iterator e) : begin_(b), end_(e) {}
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iterator begin_;
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iterator mutable end_;
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};
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template<typename T>
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struct range<T, typename enable_if<is_range<T> >::type> : public range_base<T>
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{
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typedef range this_type;
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typedef range_base<T> base_type;
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typedef typename base_type::iterator iterator;
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typedef typename base_type::const_iterator const_iterator;
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typedef const_iterator sentry_type;
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range (T& r) : base_type(r.begin(), r.end()) {}
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iterator end () { return base_type::end_; }
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const_iterator end () const { return base_type::end_; }
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sentry_type sentry () const { return base_type::end_; }
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bool empty () const { return base_type::begin_ == base_type::end_; }
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};
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template<typename T>
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struct range<T*, typename enable_if<cnv::is_char<T> >::type> : public range_base<T*>
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{
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typedef range this_type;
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typedef range_base<T*> base_type;
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typedef typename remove_const<T>::type value_type;
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typedef T* iterator;
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typedef value_type const* const_iterator;
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struct sentry_type
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{
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friend bool operator!=(iterator it, sentry_type) { return !!*it; }
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};
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range (iterator b, iterator e =0) : base_type(b, e) {}
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iterator end () { return base_type::end_ ? base_type::end_ : (base_type::end_ = base_type::begin_ + size()); }
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const_iterator end () const { return base_type::end_ ? base_type::end_ : (base_type::end_ = base_type::begin_ + size()); }
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sentry_type sentry () const { return sentry_type(); }
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std::size_t size () const { return std::char_traits<value_type>::length(base_type::begin_); }
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bool empty () const { return !*base_type::begin_; }
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};
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template<typename T>
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struct range<T* const, void> : public range<T*>
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{
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range (T* b, T* e =0) : range<T*>(b, e) {}
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};
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template <typename T, std::size_t N>
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struct range<T [N], void> : public range<T*>
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{
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range (T* b, T* e =0) : range<T*>(b, e) {}
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};
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}}
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#endif // BOOST_CONVERT_DETAIL_RANGE_HPP
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