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c++经典教材 Blitz++ v0.8

<H3> 1.5.4 Explicit instantiation </H3>
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<P>

It is not possible to do explicit instantiation of Blitz++ arrays.  If you
aren't familiar with explicit instantiation of templates, then this fact
will never bother you.
</P><P>

The reason is that explicit instantiation results in all members of a class
template being instantiated.  This is <STRONG>not</STRONG> the case for implicit
instantiation, in which only required members are instantiated.  The
<CODE>Array&#60;T,N&#62;</CODE> class contains members which are not valid for all types
<CODE>T</CODE>: for example, the binary AND operation <CODE>&#38;=</CODE> is nonsensical if
<CODE>T=float</CODE>.  If you attempt to explicitly instantiate an array class,
e.g.
</P><P>

<CODE>template class Array&#60;float,3&#62;;</CODE>
</P><P>

then you will be rewarded with many compile errors, due to methods such as
<CODE>&#38;=</CODE> which are nonsensical for <CODE>float</CODE>.
</P><P>

As some consolation, explicit instantiation would not be much help with
Blitz++ arrays.  The typical use for explicit instantiation is to
instantiate all the templates you need in one compilation unit, and turn off
implicit instantiation in the others -- to avoid duplicate instantiations
and reduce compile times.  This is only possible if you can predict ahead of
time what needs instantiation.  Easy for simple templates, but impossible
for classes like <CODE>Array</CODE>.  Almost every line of code you write using
<CODE>Array</CODE> will cause a different set of things to be implicitly
instantiated.
</P><P>

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<H2> 1.6 Licensing terms </H2>
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<P>

The Blitz++ library is licensed under both the GPL and the more permissive
"Blitz++ Artistic License".  Take your pick.  They are detailed in GPL
and LICENSE, respectively.  The artistic license is more appropriate for
commercial use, since it lacks the "viral" properties of the GPL.
</P><P>

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
</P><P>

Copyright (C) 1996--2003 Free Software Foundation, Inc.
</P><P>

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<H2> 1.7 Mailing lists and support </H2>
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<H3> 1.7.1 How to get help </H3>
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<P>

The starting point for all bug reports, feature requests and support
questions is the Blitz++ support page, at
<A HREF="http://oonumerics.org/blitz/support/">http://oonumerics.org/blitz/support/</A>
</P><P>

Please note the search engine box on this web page which lets you search the
mailing list archives.  This will often turn up answers to your question if
it has been asked before.
</P><P>

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<H3> 1.7.2 How to subscribe to a mailing list </H3>
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<P>

To subscribe to a Blitz++ mailing list, send a message containing one (or
more) of these lines to <A HREF="mailto:[e-mail]">[e-mail]</A>:
</P><P>

<TABLE><tr><td>&nbsp;</td><td class=example><pre>subscribe blitz-support
subscribe blitz-bugs
subscribe blitz-dev
</pre></td></tr></table></P><P>

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<H3> 1.7.3 blitz-bugs </H3>
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<P>

You can report bugs (or things you suspect might be bugs) to
<A HREF="mailto:[e-mail]">[e-mail]</A>.
</P><P>

It's not a very interesting list to be subscribed to.  There are archives
available from the Blitz++ web site.
</P><P>

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<H3> 1.7.4 blitz-dev </H3>
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<P>

Blitz++ is in open development: anyone can contribute features and code to
the library.  If you are interested in helping out with coding or porting,
you should start by subscribing to the <CODE>blitz-dev</CODE> mailing list.  
</P><P>

This list is also the appropriate place to send suggestions for features;
just send email to <A HREF="mailto:[e-mail]">[e-mail]</A>.  We can't implement it
if you don't suggest it.
</P><P>

Archives of this list are available from the Blitz++ web site.
</P><P>

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<H3> 1.7.5 blitz-support </H3>
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This mailing list is for posting and answering questions about using the
Blitz++ library.  Anyone can post questions; anyone can answer.
</P><P>

    
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