is_nan.hpp

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#ifndef STAN_MATH_PRIM_FUN_IS_NAN_HPP
#define STAN_MATH_PRIM_FUN_IS_NAN_HPP
 
#include <stan/math/prim/meta.hpp>
#include <cmath>
 
namespace stan {
namespace math {
 
template <typename T, require_integral_t<T>* = nullptr>
inline bool is_nan(T x) {
  return false;
}
 
template <typename T, require_floating_point_t<T>* = nullptr>
inline bool is_nan(T x) {
  return std::isnan(x);
}
 
template <typename T, require_eigen_t<T>* = nullptr>
inline bool is_nan(const T& x) {
  return x.hasNan();
}
 
}  // namespace math
}  // namespace stan
 
#endif