Difference between std:string and std::string [duplicate]

Question

In one function of my code I found a bug. It was written std:string :

const std::string currentDateTime() {     time_t     now = time(0);     struct tm  tstruct;     char       buf[80];     tstruct = *localtime(&now);     //strftime(buf, sizeof(buf), "%Y-%m-%d.%X", &tstruct);     strftime(buf, sizeof(buf), "%Y%m%d%X", &tstruct);      std:string str = buf;      str.erase(std::remove(str.begin(), str.end(), ':'), str.end());     return str; } 

The code compiles without errors. Why does it compile? What does std:string mean then?

Answer 1

It is interpreted as a label that can be used with goto.

int main() {     //label to jump to:     label_name:     //some code     <..>     //some code     goto label_name;//jump to the line with the lable } 

Obviously that was a typo. Your code compiled because using namespace std; or using std::string was used somewhere above. Otherwise you'd get a "string was not declared in this scope" error.