The following code example is taken from the book
C++23 - The Complete Guide
by Nicolai M. Josuttis,
Leanpub, 2026
The code is licensed under a
Creative Commons Attribution 4.0 International License.
// raw code
#include <print>
#include <vector>
#include <list>
#include <chrono>
using namespace std::literals;
int main()
{
// print floating point elements:
std::vector<double> coll{0, 8.8, 15, 47.11, -1, 42};
std::println("coll: {}", coll); // default
std::println(" .2: {::.2f}\n", coll); // 2 digits after dot
// print nested collections without and with hexadecimal values:
std::vector<std::list<int>> coll2d{{1, 1, 1}, {47, 11}, {0, 8, 15}};
std::println("coll2d: {}", coll2d);
std::println(" hex: {:::02X}\n", coll2d);
// print collection with timepoints:
auto now = std::chrono::system_clock::now();
std::vector dates{now, now + 8h};
std::println("dates: {::%F %X}", dates);
std::println("times: {::%R}", dates);
}