test_for_zero.hpp

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#include <cmath>
#include <iostream>
#include <string>
 
#pragma once
 
template <class T> void test_for_zero(const T &t, const std::string &s) {
  if (std::abs(t) < 1e-8)
    std::cout << "PASS: " << s << "\n";
  else {
    std::cerr << "FAIL: " << s << " " << std::abs(t) << "\n";
    std::exit(1);
  }
}