std_isnan.hpp

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#ifndef STAN_MATH_REV_CORE_STD_ISNAN_HPP
#define STAN_MATH_REV_CORE_STD_ISNAN_HPP
 
#include <stan/math/rev/core/var.hpp>
#include <cmath>
 
namespace std {
 
inline bool isnan(const stan::math::var& a) { return isnan(a.val()); }
 
}  // namespace std
#endif