identity_constrain.hpp

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#ifndef STAN_MATH_REV_CONSTRAINT_IDENTITY_CONSTRAIN_HPP
#define STAN_MATH_REV_CONSTRAINT_IDENTITY_CONSTRAIN_HPP
 
#include <stan/math/rev/meta.hpp>
#include <stan/math/rev/core.hpp>
#include <stan/math/prim/constraint/identity_constrain.hpp>
#include <stan/math/rev/fun/to_var_value.hpp>
namespace stan {
namespace math {
 
template <typename T, typename... Types,
          require_eigen_vt<std::is_arithmetic, T>* = nullptr,
          require_any_var_matrix_t<T, Types...>* = nullptr>
inline auto identity_constrain(T&& x, Types&&... /* args */) {
  return var_value<plain_type_t<T>>(x);
}
 
template <typename T, typename... Types, require_eigen_vt<is_var, T>* = nullptr,
          require_any_var_matrix_t<T, Types...>* = nullptr>
inline auto identity_constrain(T&& x, Types&&... /* args */) {
  return to_var_value(x);
}
 
template <typename T, typename... Types, require_var_matrix_t<T>* = nullptr,
          require_any_var_matrix_t<T, Types...>* = nullptr>
inline auto identity_constrain(T&& x, Types&&... /* args */) {
  return x;
}
 
}  // namespace math
}  // namespace stan
 
#endif