Function divide

12.04-constexprThrow0/main.cpp:7–15

#include <stdexcept>

constexpr double divide(int a, int b)
{
  if(0 == b) {
    // #A If not 0 at compile-time, it is fine
    throw std::overflow_error("Divide by zero");
  }

  return a / b;
}

int main()
{