constexpr-min.cpp

#include <iostream>

template<typename TNum>
constexpr TNum min2 (TNum first, TNum second)
{
  return (first < second) ? first : second;
}

template<typename TNum, typename... Args>
constexpr TNum
min_of (TNum first, Args... args);

template<typename TNum>
constexpr TNum
min_of (TNum first);

template<typename TNum>
constexpr TNum
min_of (TNum first)
{
 return first;
}

template<typename TNum, typename... Args>
constexpr TNum
min_of (TNum first, Args... other)
{
  return min2 (first, min_of<Args...> (other...));
}

int main ()
{
  constexpr int val = min_of (-100500, -14, 0);
  static_assert (val == -100500, "");
  std::cout << val << std::endl;
  return 0;
}