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<H2><A NAME="SECTION02431000000000000000"></A><A NAME="ssec:basics:fundamental:numbers"></A><A NAME="2151"></A><A NAME="2152"></A>
<BR>
Numeric Types
</H2>
<P>
The SIDL types <TT><I CLASS="slanted">bool</I></TT>, <TT><I CLASS="slanted">char</I></TT>, <TT><I CLASS="slanted">int</I></TT>,
<TT><I CLASS="slanted">long</I></TT>, <TT><I CLASS="slanted">float</I></TT>, <TT><I CLASS="slanted">double</I></TT>, <TT><I CLASS="slanted">fcomplex</I></TT>,
and <TT><I CLASS="slanted">dcomplex</I></TT> are the smallest and easiest data
types to transfer between languages transparently.
They all have a fixed size and can just as
reasonably be copied as passed by reference.
<P>
Most languages natively support all of these data types
(though perhaps less so with complex types). There are
a few notable exceptions that may be of interest.
<P>
ANSI C does not define the size of
<TT>int</TT> and <TT>long</TT>, only that the latter be at least
as big as the former. As of the C99 standard, there
are types <TT>int32_t</TT> and <TT>int64_t</TT> that
are signed integers that explicitly support a fixed number of bits.
Most compilers already have these symbols defined appropriately
in <TT>sys/types.h</TT> (pre C99 standard) or <TT>inttypes.h</TT>.
<P>
Python defines its <TT>int</TT> and <TT>long</TT> to be equivalent
to C, and therefore suffers the same platform dependent
integer size problem with less flexibility for a workaround.
It is not uncommon for regression tests involving longs and
Python to fail on certain platforms. Python 2.2 has a patch to make
SIDL long support better.
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