ESMF_InfoIsSet Function

function ESMF_InfoIsSet(info, key, keywordEnforcer, rc) result(is_set)
! !ARGUMENTS:
  type(ESMF_Info), intent(in) :: info
  character(len=*), intent(in) :: key
type(ESMF_KeywordEnforcer), optional:: keywordEnforcer ! must use keywords below
  integer, intent(out), optional :: rc
! !RETURN VALUE:
  logical :: is_set
!
! !DESCRIPTION:
!     Returns true if the target value is not null \cite{json_for_modern_cpp_null}.
!
!     The arguments are:
!     \begin{description}
!     \item [info]
!       Target \texttt{ESMF\_Info} object.
!     \item [key]
!       String key to access in \texttt{ESMF\_Info} storage. See section \ref{info_key_format}
!       for an overview of the key format.
!     \item [{[rc]}]
!       Return code; equals {\tt ESMF\_SUCCESS} if there are no errors.
!     \end{description}
!EOP

  integer :: localrc
  integer(C_INT) :: is_set_c

  is_set = .false.
  localrc = ESMF_FAILURE
  if (present(rc)) rc = ESMF_FAILURE

  call c_info_is_set(info%ptr, trim(key)//C_NULL_CHAR, is_set_c, localrc)
  if (ESMF_LogFoundError(localrc, ESMF_ERR_PASSTHRU, ESMF_CONTEXT, rcToReturn=rc)) return

  if (is_set_c == 1) then
    is_set = .true.
  end if

  if (present(rc)) rc = ESMF_SUCCESS
end function ESMF_InfoIsSet