string:empty

C++ Reference

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empty

Syntax:

    #include <string>
    bool empty() const;

The empty() function returns true if the string has no elements, false otherwise. For example:

    string s1;
    string s2("");
    string s3("This is a string");
    cout.setf(ios::boolalpha);
    cout << s1.empty() << endl;
    cout << s2.empty() << endl;
    cout << s3.empty() << endl;

When run, this code produces the following output:

    true
    true
    false