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<H1><A NAME="SECTION03420000000000000000"></A><A NAME="ss:f90:types"></A><A NAME="8001"></A>
<BR>
Basic Types
</H1>
<P>
<BR><P></P>
<DIV ALIGN="CENTER">
<A NAME="tbl:f90:types"></A>
<DIV ALIGN="CENTER">
<A NAME="8003"></A>
<TABLE CELLPADDING=3 BORDER="1">
<CAPTION><STRONG>Table 9.1:</STRONG>
SIDL to FORTRAN 90 type mapping</CAPTION>
<TR><TH ALIGN="LEFT"><SPAN CLASS="textbf">SIDL TYPE</SPAN></TH>
<TH ALIGN="LEFT"><SPAN CLASS="textbf">FORTRAN 90 TYPE</SPAN></TH>
</TR>
<TR><TD ALIGN="LEFT"><TT><I CLASS="slanted">int</I></TT></TD>
<TD ALIGN="LEFT"><TT>INTEGER (SELECTED_INT_KIND(9))</TT></TD>
</TR>
<TR><TD ALIGN="LEFT"><TT><I CLASS="slanted">long</I></TT></TD>
<TD ALIGN="LEFT"><TT>INTEGER (SELECTED_INT_KIND(18))</TT></TD>
</TR>
<TR><TD ALIGN="LEFT"><TT><I CLASS="slanted">float</I></TT></TD>
<TD ALIGN="LEFT"><TT>REAL (SELECTED_REAL_KIND(6,37))</TT></TD>
</TR>
<TR><TD ALIGN="LEFT"><TT><I CLASS="slanted">double</I></TT></TD>
<TD ALIGN="LEFT"><TT>REAL (SELECTED_REAL_KIND(15, 307))</TT></TD>
</TR>
<TR><TD ALIGN="LEFT"><TT><I CLASS="slanted">bool</I></TT></TD>
<TD ALIGN="LEFT"><TT>LOGICAL</TT></TD>
</TR>
<TR><TD ALIGN="LEFT"><TT><I CLASS="slanted">char</I></TT></TD>
<TD ALIGN="LEFT"><TT>CHARACTER (LEN=1)</TT></TD>
</TR>
<TR><TD ALIGN="LEFT"><TT><I CLASS="slanted">string</I></TT></TD>
<TD ALIGN="LEFT"><TT>CHARACTER (LEN=*)</TT></TD>
</TR>
<TR><TD ALIGN="LEFT"><TT><I CLASS="slanted">fcomplex</I></TT></TD>
<TD ALIGN="LEFT"><TT>COMPLEX (SELECTED_REAL_KIND(6, 37))</TT></TD>
</TR>
<TR><TD ALIGN="LEFT"><TT><I CLASS="slanted">dcomplex</I></TT></TD>
<TD ALIGN="LEFT"><TT>COMPLEX (SELECTED_REAL_KIND(15, 307))</TT></TD>
</TR>
<TR><TD ALIGN="LEFT"><TT><I CLASS="slanted">enum</I></TT></TD>
<TD ALIGN="LEFT"><TT>INTEGER (SELECTED_INT_KIND(9))</TT></TD>
</TR>
<TR><TD ALIGN="LEFT"><TT><I CLASS="slanted">opaque</I></TT></TD>
<TD ALIGN="LEFT"><TT>INTEGER (SELECTED_INT_KIND(18))</TT></TD>
</TR>
</TABLE>
</DIV>
</DIV>
<BR>
<P>
The mapping for simple SIDL types to FORTRAN 90 is given in
Table <A HREF="#tbl:f90:types">9.1</A>. For opaque pointers, the equivalent of a
SIDL double is used. <A NAME="8036"></A>That is, the intermediate object reference
assumes a 64-bit integer is used to enable portability between systems
with a 32 bit address space and those with a 64 bit address space. On
a 32 bit system, the upper 32 bits of these quantities are ignored.
Systems with more than 64-bit pointers aren't currently supported.
<P>
For interfaces, classes and arrays, there is a derived type that holds
an opaque pointer. The derived type for arrays of numeric types also
has a F90 pointer to an array to provide native array access without
function calls. For each interface and class, there are two modules
created. In the first module, the derived type for the object and
array are defined. In the second, the methods for the object/interface
and arrays of the object/interface are defined. Clients of a class or
interface, typically <TT>use</TT> the module containing the methods, and
it in turn uses the module containing the types.
<P>
Generally, clients should treat opaque, interface, class and array values
as black boxes. However, there is one value that is special. A value of
zero for any of these quantities indicates that the value does not refer
to an object. <A NAME="8038"></A>Zero is the equivalent of NULL. Any nonzero value is or
should be a valid object reference. The method module provides
functions to test whether an interface, class or array value
<TT>is_null</TT> or is <TT>not_null</TT>. There is also a subroutine to
initialize the value to indexFORTRAN 90!set_null<TT>set_null</TT>. Clients should generally
initialize new interface or class values to NULL.
<P>
The SIDL string type mapping is currently identical to that of the
FORTRAN 77 mapping. <A NAME="8043"></A>That is,
all FORTRAN 90 strings have a limited
fixed size. When implementing a subroutine with an out parameter, the
size of the string is limited to 512 characters. This can be changed
when configuring babel by changing the value of
<TT>SIDL_F90_STR_MINSIZE</TT> in <TT>runtime/sidl/babel_config.h</TT>
before compiling and installing babel.
<P>
Enumerated types are just integer values. The integer parameters are
defined in a module.
<P>
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