is_vari.hpp

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#ifndef STAN_MATH_REV_META_IS_VARI_HPP
#define STAN_MATH_REV_META_IS_VARI_HPP
 
#include <stan/math/rev/core/vari.hpp>
#include <stan/math/prim/meta.hpp>
#include <type_traits>
 
namespace stan {
 
namespace internal {
template <typename T>
struct is_vari_impl : std::false_type {};
 
template <typename T>
struct is_vari_impl<math::vari_value<T>> : std::true_type {};
 
template <typename T>
struct is_vari_impl<math::vari_view<T>> : std::true_type {};
 
}  // namespace internal
template <typename T>
struct is_vari<T, require_t<internal::is_vari_impl<std::decay_t<T>>>>
    : std::true_type {};
 
}  // namespace stan
#endif