1 #ifndef STAN_MATH_PRIM_FUN_IS_INF_HPP 2 #define STAN_MATH_PRIM_FUN_IS_INF_HPP 3 4 #include <stan/math/prim/meta.hpp> 5 #include <cmath> 6 7 namespace stan { 8 namespace math { 9 10 /** 11 * Returns true if the input is infinite and false otherwise. 12 * 13 * Delegates to <code>std::isinf</code>. 14 * 15 * @param x Value to test. 16 * @return <code>true</code> if the value is infinite. 17 */ is_inf(double x)18inline bool is_inf(double x) { return std::isinf(x); } 19 20 } // namespace math 21 } // namespace stan 22 23 #endif 24