98 lines
3.3 KiB
C++
98 lines
3.3 KiB
C++
/*
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* This file is part of the DXX-Rebirth project <http://www.dxx-rebirth.com/>.
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* It is copyright by its individual contributors, as recorded in the
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* project's Git history. See COPYING.txt at the top level for license
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* terms and a link to the Git history.
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*/
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#pragma once
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#include <stdexcept>
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#include <cstdio>
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#include "dxxsconf.h"
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#include "compiler-addressof.h"
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#include "compiler-begin.h"
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#include "compiler-type_traits.h"
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template <typename iterator>
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struct partial_range_t
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{
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iterator m_begin, m_end;
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partial_range_t(iterator b, iterator e) :
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m_begin(b), m_end(e)
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{
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}
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iterator begin() const { return m_begin; }
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iterator end() const { return m_end; }
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};
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#ifdef DXX_HAVE_BOOST_FOREACH
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#include <boost/range/const_iterator.hpp>
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#include <boost/range/mutable_iterator.hpp>
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namespace boost
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{
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template <typename iterator>
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struct range_mutable_iterator< partial_range_t<iterator> >
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{
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typedef iterator type;
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};
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template <typename iterator>
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struct range_const_iterator< partial_range_t<iterator> >
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{
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typedef iterator type;
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};
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}
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#endif
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template <typename T>
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struct partial_range_error_t : public std::out_of_range
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{
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partial_range_error_t(const std::string& s) :
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std::out_of_range(s)
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{
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}
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static void report(const char *desc, unsigned long expr, const T &t, unsigned long d)
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{
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char buf[84];
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snprintf(buf, sizeof(buf), "%s %lu past %p end %lu", desc, expr, addressof(t), d);
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throw partial_range_error_t<T>(buf);
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}
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};
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template <typename T, typename U>
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typename tt::enable_if<!tt::is_unsigned<U>::value, T &>::type partial_range(T &, U, U = U()) DXX_CXX11_EXPLICIT_DELETE;
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template <typename T, typename U>
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static inline typename tt::enable_if<tt::is_unsigned<U>::value, partial_range_t<typename tt::conditional<tt::is_const<T>::value, typename T::const_iterator, typename T::iterator>::type>>::type partial_range(T &t, const U o, const U l) __attribute_warn_unused_result;
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template <typename T, typename U>
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static inline typename tt::enable_if<tt::is_unsigned<U>::value, partial_range_t<typename tt::conditional<tt::is_const<T>::value, typename T::const_iterator, typename T::iterator>::type>>::type partial_range(T &t, const U o, const U l)
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{
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using std::advance;
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using std::distance;
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auto range_begin = begin(t);
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auto range_end = range_begin;
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#define PARTIAL_RANGE_CHECK_BOUND(EXPR,S) \
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if (EXPR > d) \
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partial_range_error_t<const T>::report(S, EXPR, t, d)
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size_t d = distance(range_begin, end(t));
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PARTIAL_RANGE_CHECK_BOUND(o, "begin");
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PARTIAL_RANGE_CHECK_BOUND(l, "end");
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#undef PARTIAL_RANGE_CHECK_BOUND
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if (o <= l)
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{
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advance(range_begin, o);
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advance(range_end, l);
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}
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return partial_range_t<typename tt::conditional<tt::is_const<T>::value, typename T::const_iterator, typename T::iterator>::type>(range_begin, range_end);
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}
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template <typename T, typename U>
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static inline typename tt::enable_if<tt::is_unsigned<U>::value, partial_range_t<typename tt::conditional<tt::is_const<T>::value, typename T::const_iterator, typename T::iterator>::type>>::type partial_range(T &t, const U l) __attribute_warn_unused_result;
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template <typename T, typename U>
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static inline typename tt::enable_if<tt::is_unsigned<U>::value, partial_range_t<typename tt::conditional<tt::is_const<T>::value, typename T::const_iterator, typename T::iterator>::type>>::type partial_range(T &t, const U l)
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{
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return partial_range(t, static_cast<U>(0), l);
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}
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