void wstring::alloc(size_t size, bool save) {
if (! check_realloc(size))
return;
Rep *p = Rep::create(size);
if (save) {
p->copy(0, data(), length());
p->len = length();
}
else
p->len = 0;
repup(p);
}
wstring& wstring::replace(size_t pos, size_t n1, const wchar_t* s, size_t n2) {
const size_t len = length();
if (pos > len)
throw out_of_range("pos > len");
if (n1 > len - pos)
n1 = len - pos;
if (len - n1 > max_size() - n2)
throw length_error("len - n1 > max_size() - n2");
size_t newlen = len - n1 + n2;
if (check_realloc(newlen)) {
Rep *p = Rep::create(newlen);
p->copy(0, data(), pos);
p->copy(pos + n2, data() + pos + n1, len -(pos + n1));
p->copy(pos, s, n2);
repup(p);
}
else {
rep()->move(pos + n2, data() + pos + n1, len -(pos + n1));
rep()->copy(pos, s, n2);
}
rep()->len = newlen;
return *this;
}
wchar_t* wstring::Rep::clone() {
Rep* p = Rep::create(len);
p->copy(0, data(), len);
p->len = len;
return p->data();
}