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Proposal for improving pure situation, #3755

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11 changes: 4 additions & 7 deletions chapters/functions.tex
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Expand Up @@ -225,16 +225,13 @@ \section{Pure Modelica Functions}\label{pure-modelica-functions}
\item
Functions defined in Modelica (non-external) are \emph{normally} assumed to be pure (the exception is the deprecated case below), if they are impure they shall be marked with the \lstinline!impure! keyword.
They can be explicitly marked as \lstinline!pure!\indexinline{pure}.
\begin{nonnormative}
However, since functions as default are pure it is not recommended to explicitly declare them as \lstinline!pure!.
\end{nonnormative}
\item
External functions must be explicitly declared with \lstinline!pure! or \lstinline!impure!.
\item
If a function is declared as \lstinline!impure! any function extending from it shall be declared as \lstinline!impure!.
\item
A deprecated semantics is that external functions (and functions defined in Modelica directly or indirectly calling them) without \lstinline!pure! or \lstinline!impure! keyword are assumed to be impure, but without any restriction on calling them.
Except for the function \lstinline!Modelica.Utilities.Streams.print!, a diagnostic must be given if called in a simulation model.
External functions should be explicitly declared with \lstinline!pure! or \lstinline!impure!.
The case without the keyword is deprecated semantics described in the next item.
\item
A deprecated semantics for functions without \lstinline!pure! or \lstinline!impure! keyword is that they assumed to be impure, but without any restriction on calling them for the following cases: external functions and functions defined in Modelica directly or indirectly (through functions without the \lstinline!pure! keyword) calling external functions without \lstinline!pure! keyword.
\end{itemize}

Calls of pure functions used inside expression may be skipped if the resulting expression will not depend on the possible returned value; ignoring the possibility of the function generating an error.
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