+ return wxStringOperations::DecodeChar(m_pos);
+}
+
+wxUniCharRef& wxUniCharRef::operator=(const wxUniChar& c)
+{
+ wxStringOperations::Utf8CharBuffer utf(wxStringOperations::EncodeChar(c));
+ size_t lenOld = wxStringOperations::GetUtf8CharLength(*m_pos);
+ size_t lenNew = wxStringOperations::GetUtf8CharLength(utf[0]);
+
+ if ( lenNew == lenOld )
+ {
+ // this is the simpler case: if the new value's UTF-8 code has the
+ // same length, we can just replace it:
+
+ iterator pos(m_pos);
+ for ( size_t i = 0; i < lenNew; ++i, ++pos )
+ *pos = utf[i];
+ }
+ else // length of character encoding in UTF-8 changed
+ {
+ // the worse case is when the new value has either longer or shorter
+ // code -- in that case, we have to use wxStringImpl::replace() and
+ // this invalidates all iterators, so we have to update them too:
+
+ wxStringImpl& strimpl = m_str.m_impl;
+
+ int iterDiff = lenNew - lenOld;
+ size_t posIdx = m_pos - strimpl.begin();
+
+ // compute positions of outstanding iterators for this string after the
+ // replacement is done (there is only a small number of iterators at
+ // any time, so we use an array on the stack to avoid unneeded
+ // allocation):
+ static const size_t STATIC_SIZE = 32;
+ size_t indexes_a[STATIC_SIZE];
+ size_t *indexes = indexes_a;
+ size_t iterNum = 0;
+ wxStringIteratorNode *it;
+ for ( it = m_str.m_iterators.ptr; it; it = it->m_next, ++iterNum )
+ {
+ wxASSERT( it->m_iter || it->m_citer );
+
+ if ( iterNum == STATIC_SIZE )
+ {
+ wxLogTrace( wxT("utf8"), wxT("unexpectedly many iterators") );
+
+ size_t total = iterNum + 1;
+ for ( wxStringIteratorNode *it2 = it; it2; it2 = it2->m_next )
+ total++;
+ indexes = new size_t[total];
+ memcpy(indexes, indexes_a, sizeof(size_t) * STATIC_SIZE);
+ }
+
+ size_t idx = it->m_iter
+ ? (*it->m_iter - strimpl.begin())
+ : (*it->m_citer - strimpl.begin());
+
+ if ( idx > posIdx )
+ idx += iterDiff;
+
+ indexes[iterNum] = idx;
+ }
+
+ // update the string:
+ strimpl.replace(m_pos, m_pos + lenOld, utf, lenNew);
+
+#if wxUSE_STRING_POS_CACHE
+ m_str.InvalidateCache();
+#endif // wxUSE_STRING_POS_CACHE
+
+ // finally, set the iterators to valid values again (note that this
+ // updates m_pos as well):
+ size_t i;
+ for ( i = 0, it = m_str.m_iterators.ptr; it; it = it->m_next, ++i )
+ {
+ wxASSERT( i < iterNum );
+ wxASSERT( it->m_iter || it->m_citer );
+
+ if ( it->m_iter )
+ *it->m_iter = strimpl.begin() + indexes[i];
+ else // it->m_citer
+ *it->m_citer = strimpl.begin() + indexes[i];
+ }
+
+ if ( indexes != indexes_a )
+ delete[] indexes;
+ }
+
+ return *this;