stl:vector:front

C++ Reference

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front

Syntax:

    #include <vector>
    TYPE& front();
    const TYPE& front() const;

The front() function returns a reference to the first element of the vector, and runs in constant time.

For example, the following code uses a vector and the sort()_algorithm to display the first word (in alphabetical order) entered by a user:

    vector<string> words;
    string str;
 
    while( cin >> str ) words.push_back(str);
 
    sort( words.begin(), words.end() );
 
    cout << "In alphabetical order, the first word is '" << words.front() << "'." << endl;

When provided with this input:

    now is the time for all good men to come to the aid of their country

…the above code displays:

    In alphabetical order, the first word is 'aid'.