Function string_as_array

Return a mutable char* pointing to a string's internal buffer, which may not be null-terminated. Writing through this pointer will modify the string. string_as_array(&str)[i] is valid for 0 <= i < str.size() until the next call to a string method that invalidates iterators. As of 2006-04, there is no standard-blessed way of getting a mutable reference to a string's internal buffer. However, issu