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Diffstat (limited to 'doc/UsersGuide/ThornWriters.tex')
| -rw-r--r-- | doc/UsersGuide/ThornWriters.tex | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/doc/UsersGuide/ThornWriters.tex b/doc/UsersGuide/ThornWriters.tex index 076203a1..266fc023 100644 --- a/doc/UsersGuide/ThornWriters.tex +++ b/doc/UsersGuide/ThornWriters.tex @@ -3969,7 +3969,11 @@ interface.ccl} file. Declare the prototype as, for example, \begin{verbatim} CCTK_REAL FUNCTION SumStuff(CCTK_REAL IN x, CCTK_REAL IN y) \end{verbatim} -\noindent and that this function will be used in your thorn by +\noindent and that this function will be either required in your thorn by +\begin{verbatim} +REQUIRES FUNCTION SumStuff +\end{verbatim} +\noindent or optionally used in your thorn by \begin{verbatim} USES FUNCTION SumStuff \end{verbatim} @@ -3984,6 +3988,8 @@ That is, the C prototype will expect an argument with intent {\tt IN} to be a value and one with intent {\tt OUT} to be a pointer. There also exists the {\tt ARRAY} keyword for passing arrays of any dimension. +Functions which are required by some thorn (which doesn't provide it itself) +are checked at startup to be provided by some other thorn. \subsection{Providing a function} |