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<H1><A NAME="SECTION00090000000000000000"></A><A NAME="sec:adding"></A>
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<BR>
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Adding smoothers and solvers to MLD2P4
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</H1>
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<P>
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<B>Da ampliare e completare - SALVATORE.</B>
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<BR>
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<P>
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Completely new smoother and/or solver classes derived from the
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base objects in the library may be used without recompiling the
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library itself. Once the new smoother/solver class has been
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developed, the user can declare a variable of that new type in the
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application, and pass that variable to the <code>p%set(solver,info)</code>
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call; the new solver object is then dynamically included in the
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preconditioner structure.
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<P>
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<BR>
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<P>
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If the user has developed a new type of smoother and/or
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solver by extending one of the base MLD2P4 types, and has declared a
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variable of the new type in the main program, it is possible to pass
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the new smoother/solver variable to the setup routine as follows:
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<DIV ALIGN="CENTER">
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<code>call p%set(smoother,info [,ilev, ilmax,pos])</code>
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<BR><code>call p%set(solver,info [,ilev, ilmax,pos])</code>
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</DIV>
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In this way, the variable will act as a <I>mold</I> to which the
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preconditioner will conform, even though the MLD2P4 library is not
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modified, and thus has no direct knowledge about the new type.
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<P>
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<BR>
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<P>
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<TABLE CELLPADDING=3>
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<TR><TD ALIGN="LEFT" VALIGN="TOP" WIDTH=34><code>smoother</code></TD>
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<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=340><code>class(mld_x_base_smoother_type)</code></TD>
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</TR>
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<TR><TD ALIGN="LEFT" VALIGN="TOP" WIDTH=34> </TD>
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<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=340>The user-defined new smoother to be employed in the
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preconditioner.</TD>
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</TR>
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<TR><TD ALIGN="LEFT" VALIGN="TOP" WIDTH=34><code>solver</code></TD>
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<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=340><code>class(mld_x_base_solver_type)</code></TD>
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</TR>
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<TR><TD ALIGN="LEFT" VALIGN="TOP" WIDTH=34> </TD>
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<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=340>The user-defined new solver to be employed in the
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preconditioner.</TD>
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</TR>
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</TABLE>
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