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add class iterator2

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the iterator class doesn't work with istream_iterator
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ritonglue 2019-10-07 21:35:48 +02:00 • committed by GitHub
parent 170e2d11f5
commit df0e5bad02
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1 changed files with 62 additions and 0 deletions
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62
source/utf8/unchecked.h
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@ -260,6 +260,68 @@ namespace utf8
return temp;
}
}; // class iterator
//the iterator2 class
template <typename octet_iterator>
class iterator2 : public std::iterator <std::input_iterator_tag, uint32_t> {
private:
uint32_t cp{};
octet_iterator p{};
const octet_iterator e{};
bool ok{};
void read()
{
ok = p != e;
if(ok)
{
cp = utf8::unchecked::next(p);
}
}
public:
iterator2 () {}
iterator2 (octet_iterator begin, octet_iterator end): p{begin}, e{end} { read(); }
iterator2 (const iterator2& a): cp{a.cp}, p{a.p}, e{a.e}, ok{a.ok} {}
uint32_t operator * () const { return cp; }
uint32_t* operator -> () const { return &cp; }
iterator2& operator ++ ()
{
if(!ok)
{
throw std::runtime_error("no such element");
}
read();
return *this;
}
iterator2 operator ++ (int)
{
if(!ok)
{
throw std::runtime_error("no such element");
}
iterator2 tmp = *this;
read();
return tmp;
}
bool equals(const iterator2& a) const
{
return ok == a.ok && (!ok || p == a.p);
}
}; // class iterator2
template <typename octet_iterator>
inline bool operator==(const iterator2<octet_iterator>& a, const iterator2<octet_iterator>& b)
{
return a.equals(b);
}
template <typename octet_iterator>
inline bool operator!=(const iterator2<octet_iterator>& a, const iterator2<octet_iterator>& b)
{
return !a.equals(b);
}
} // namespace utf8::unchecked
} // namespace utf8