116 lines
4.2 KiB
C++
116 lines
4.2 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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struct base_partial_range_error_t : std::out_of_range
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{
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DXX_INHERIT_CONSTRUCTORS(base_partial_range_error_t, std::out_of_range);
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static std::string prepare(const char *file, unsigned line, const char *estr, const char *desc, unsigned long expr, const void *t, unsigned long d)
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{
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char buf[256];
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snprintf(buf, sizeof(buf), "%s:%u: %s %lu past %p end %lu \"%s\"", file, line, desc, expr, t, d, estr);
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return buf;
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}
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};
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template <typename T>
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struct partial_range_error_t : base_partial_range_error_t
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{
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DXX_INHERIT_CONSTRUCTORS(partial_range_error_t, base_partial_range_error_t);
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static void report(const char *file, unsigned line, const char *estr, const char *desc, unsigned long expr, const T &t, unsigned long d)
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{
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throw partial_range_error_t<T>(base_partial_range_error_t::prepare(file, line, estr, desc, expr, addressof(t), d));
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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(const char *, unsigned, const char *, T &, U, U = U()) = delete;
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template <typename T, typename U, typename I = decltype(begin(*(T *)0))>
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static inline typename tt::enable_if<tt::is_unsigned<U>::value, partial_range_t<I>>::type partial_range(const char *, unsigned, const char *, T &t, const U &o, const U &l) __attribute_warn_unused_result;
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template <typename T, typename U, typename I>
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static inline typename tt::enable_if<tt::is_unsigned<U>::value, partial_range_t<I>>::type partial_range(const char *file, unsigned line, const char *estr, T &t, const U &uo, const U &ul)
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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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size_t o = uo, l = ul;
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#ifdef DXX_HAVE_BUILTIN_CONSTANT_P
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#define PARTIAL_RANGE_COMPILE_CHECK_BOUND(EXPR,S) \
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(__builtin_constant_p(EXPR) && __builtin_constant_p(d) && (DXX_ALWAYS_ERROR_FUNCTION(partial_range_will_always_throw, S " will always throw"), 0))
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if (__builtin_constant_p(!(o < l)) && !(o < l))
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DXX_ALWAYS_ERROR_FUNCTION(partial_range_is_always_empty, "offset never less than length");
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#else
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#define PARTIAL_RANGE_COMPILE_CHECK_BOUND(EXPR,S) 0
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#endif
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#define PARTIAL_RANGE_CHECK_BOUND(EXPR,S) \
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if (EXPR > d) \
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((void)(PARTIAL_RANGE_COMPILE_CHECK_BOUND(EXPR,S))), \
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partial_range_error_t<const T>::report(file, line, estr, 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 {range_begin, range_end};
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}
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template <typename T, typename U, typename I = decltype(begin(*(T *)0))>
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static inline typename tt::enable_if<tt::is_unsigned<U>::value, partial_range_t<I>>::type partial_range(const char *, unsigned, const char *, T &t, const U &l) __attribute_warn_unused_result;
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template <typename T, typename U, typename I>
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static inline typename tt::enable_if<tt::is_unsigned<U>::value, partial_range_t<I>>::type partial_range(const char *file, unsigned line, const char *estr, T &t, const U &l)
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{
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return partial_range(file, line, estr, t, static_cast<U>(0), l);
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}
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#define partial_range(T,...) partial_range(__FILE__, __LINE__, #T, T, ##__VA_ARGS__)
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