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C++17 in Detail: A Deep Dive

New Mathematical Functions

With C++17 we get lots of new mathematical functions like gcd, lcm, clamp and other special ones.

We'll cover the following...

gcd and lcm #

std::gcd and std::lcm, introduced in P0295R0, are declared in <numeric> header:​

C++ 17
#include <iostream>
#include <numeric>  // for gcm, lcm
int main() {
    std::cout << std::gcd(24, 60) << ',';
    std::cout << std::lcm(15, 50) << '\n';
}

clamp(v, min, max) #

Another useful function is clamp(v, min, max), declared in <algorithm>, from P0025:

C++ 17
#include <iostream>
#include <algorithm>  // clamp
int main() {
  std::cout << std::clamp(300, 0, 255) << ',';
  std::cout << std::clamp(-10, 0, 255) << '\n';
}

​And what’s more, here are newly available special functions, defined in the <cmath> header.

Function Description
...