stringstream iss(s); string tmp; for(char i:pattern) { iss>>tmp;

This code snippet takes a string stream "iss" and a pattern string. It then loops through the characters in the pattern string and extracts a string from the string stream for each character.

Inside the loop, a temporary string "tmp" is declared. The stringstream "iss" is used to extract a string from the input stream and store it in "tmp". The extraction is done using the stream extraction operator ">>". This operator reads characters from the stream until it encounters whitespace or a delimiter character, and stores the result in the variable on the right-hand side.

After the loop completes, the "tmp" string will contain the last string extracted from the stream, which may or may not be used later in the code.