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Returns a reference to the first element in the container.
Calling front on an empty container is undefined.
Parameters
(none).
Return value
reference to the first element.
Complexity
Constant.
Notes
For a container c, the expression c.front() is equivalent to *c.begin().
Example
The following code uses front to display the first element of a std::vector<char>:
1 2 3 4 5 6 7 8 9 10 11 | #include <vector>#include <iostream> int main(){ std::vector<char> letters {'o', 'm', 'g', 'w', 't', 'f'}; if (!letters.empty()) { std::cout << "The first character is: " << letters.front() << '\n'; } } |
Output:
1 | The first character is o |
See also
| access the last element (public member function) |
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