c++ - 是否有附加到字符串的 getline(istream, string, delim)？

Question

这会很好地避免复制。 std 或 boost 中有什么可以做到这一点吗？

Answer 1

std::string mystring = "HELLO "; //initial string
int len = mystring.size(); //get initial length
mystring.resize(100); //resize so it's big enough
char* buffer = &mystring[len-1]+1; //get pointer to "spare" space
std::cin.get(buffer , 100-len, '\n'); //read into buffer, until newline
mystring.resize(len + std::cin.gcount()); //shrink to correct size