The C++ queue front function returns the value of the front element in the queue. The front element is the first element that was inserted in the queue and is the next to leave.
Example:
```c++
#include
#include
int main() {
std::queue myQueue;
myQueue.push(10);
myQueue.push(20);
myQueue.push(30);
std::cout << "The front element is: " << myQueue.front() << std::endl;
return 0;
}
```
In the above example, we create a queue instance `myQueue` and push three elements onto it using the `push()` function. We then call `myQueue.front()` to get the value of the front element which is printed to the console.
This example uses the standard library for C++, which provides the `queue` class as well as the `front()` function.
Package library: Standard Library.
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