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This commit is contained in:
John Cupitt 2014-11-03 12:03:33 +00:00
parent bbf49be063
commit f1a3b866f7
1 changed files with 14 additions and 14 deletions
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doc/reference/using-cpp.xml
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@ -287,23 +287,23 @@ main( int argc, char **argv )
<title>Extending the C++ interface</title>
<para>
The C++ interface comes in two parts. First, VImage8.h defines a simple
layer over #GObject for automatic reference counting, then a generic way
to call any vips8 operation with VImage::call(), then a few convenience
functions, then a set of overloads.
The C++ interface comes in two parts. First, VImage8.h defines a simple
layer over #GObject for automatic reference counting, then a generic way
to call any vips8 operation with VImage::call(), then a few convenience
functions, then a set of overloads.
</para>
<para>
The member function for each operation, for example VImage::add(), is
generated by a small Python program called <code>gen-operators.py</code>,
and its companion, <code>gen-operators-h.py</code> to generate the
headers. If you write a new VIPS operator, you'll need to rerun these
programs to make the new member function.
The member function for each operation, for example VImage::add(), is
generated by a small Python program called <code>gen-operators.py</code>,
and its companion, <code>gen-operators-h.py</code> to generate the
headers. If you write a new VIPS operator, you'll need to rerun these
programs to make the new member function.
</para>
<para>
You can write the wrapper yourself, of course, they are very simple.
The one for VImage::add() looks like this:
<para>
You can write the wrapper yourself, of course, they are very simple.
The one for VImage::add() looks like this:
<programlisting language="C++">
VImage VImage::add(VImage right, VOption *options)
@ -317,11 +317,11 @@ VImage VImage::add(VImage right, VOption *options)
set("left", *this) ->
set("right", right));
return out;
return out;
}
</programlisting>
Where VImage::call() is the generic call-a-vips8-operation function.
Where VImage::call() is the generic call-a-vips8-operation function.
</para>
</refsect1>
</refentry>