// https://godbolt.org/z/47j8h9e7v
#include <chrono>
#include <iostream>
void sleep(std::chrono::seconds dur) {
std::cout << dur.count() << "s\n";
/* ... */
}
int main() {
using namespace std::chrono;
sleep(3); // (ERR) Error: no implicit conversion from int
sleep(seconds{4}); // okay
sleep(5s); // okay
seconds x{6};
sleep(x); // okay
auto y = 10s;
y += 20s; // Incrementing with seconds
sleep(y); // now 30s
y = y - 6s; // Subtraction of seconds
sleep(y); // and now only 24s
y /= 2; // Division by a scalar
sleep(y); // 12s
sleep(y + 7); // (ERR) Error: seconds+int is not allowed
}