Does an empty string contain an empty string in C++?

Question

Just had an interesting argument in the comment to one of my questions. My opponent claims that the statement \"\" does not contain \"\"<

Answer 1

C++ agrees with your "opponent":

#include 
#include 
using namespace std;

int main()
{
    bool contains = string("").find(string("")) != string::npos;
    cout << "\"\" contains \"\": "
        << boolalpha << contains;
}

Output: "" contains "": true

Demo