128   scan_context scan_ctx_;  member
135     auto it = scan_ctx_.begin(), end = scan_ctx_.end();  in read_uint()
142     scan_ctx_.advance_to(it);  in read_uint()
147     auto it = scan_ctx_.begin(), end = scan_ctx_.end();  in read_int()
150     scan_ctx_.advance_to(it);  in read_int()
158       : parse_ctx_(format), scan_ctx_(input), args_(args), next_arg_id_(0) {}  in scan_handler()
160   const char* pos() const { return scan_ctx_.begin(); }  in pos()
164     auto it = scan_ctx_.begin();  in on_text()
165     if (it + size > scan_ctx_.end() ||  in on_text()
169     scan_ctx_.advance_to(it + size);  in on_text()
181     auto it = scan_ctx_.begin(), end = scan_ctx_.end();  in on_replacement_field()
197       scan_ctx_.advance_to(it);  in on_replacement_field()
203       scan_ctx_.advance_to(it);  in on_replacement_field()
215     arg_.custom.scan(arg_.custom.value, parse_ctx_, scan_ctx_);  in on_format_specs()