json-validator/include/jvalidate/constraint/number_constraint.h

#pragma once

#include <cmath>
#include <limits>

#include <jvalidate/detail/number.h>
#include <jvalidate/forward.h>

namespace jvalidate::constraint {
struct MaximumConstraint {
  double value;
  bool exclusive;

  bool operator()(double arg) const { return exclusive ? arg < value : arg <= value; }
};

struct MinimumConstraint {
  double value;
  bool exclusive;

  bool operator()(double arg) const { return exclusive ? arg > value : arg >= value; }
};

struct MultipleOfConstraint {
  double value;

  bool operator()(double arg) const {
    if (std::fabs(std::remainder(arg, value)) <= std::numeric_limits<double>::epsilon()) {
      return true;
    }

    double const div = arg / value;
    return std::isfinite(div) && detail::is_json_integer(div);
  }
};
}