lst-0007-book.cpp
// https://godbolt.org/z/qGrYPrqYn
#include <vector>
#include <iostream>
using namespace std;
int main() {
vector nums{ 1,2,3 };
vector four{ 4,5,6 };
vector seven{ 7,8,9 } ;
nums.insert(nums.begin(), four.begin(), four.end()); // pair of iterators
cout << nums.size() << "\n"; // Output: 9
nums.insert_range(nums.begin(), seven); // C++23: range
}