lst-0695-book.cpp
// https://godbolt.org/z/M1d9jEP74
#include <vector>
#include <iostream>
using namespace std;
int main() {
vector numbers{ 1,2,3,4,5 };
numbers.erase(numbers.begin(), numbers.end());
cout << numbers.size() << "\n"; // Ausgabe: 0
}