c++中用递归函数实现求字符串串长。 求详解

#include #include #include using namespace std; size_t size_of(string obj); size_t size_of(string &obj, string::iterator iter) { if(iter == obj.end()) return (size_t)0; else return (size_of(obj, iter+1) + 1); } int main() { string obj = "abcdef&qu