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#include <string>
#include <iostream>
 
 
int main()
{
 
 //If size() is zero, npos is always returned. 
 std::string empty;
 int n = empty.rfind("", 0);
 std::cout << "n = " << n << std::endl ; //return 0 instead of npos
 
 //If searching for an empty string (str.size(), count, or strlen(s) is zero) 
 //returns pos (the empty string is found immediately) unless pos == npos, 
 //in which case returns size().
 const std::string nonempty = "0123456789";
 n = nonempty.rfind("", 15);
 std::cout << "n = " << n << std::endl ; //return size() = 10 instead of pos(15)
 
}