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<p class=MsoNormal>So here is some strange behavior I ran across with BP. A take
a look at this example code: <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>busybox.cpp:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:Consolas;color:blue'>#include</span><span style='font-size:9.0pt;
font-family:Consolas'> <span style='color:#A31515'>"stdafx.h"<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:Consolas;color:#A31515'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:Consolas'>std::string foo_int (<span style='color:blue'>int</span>
arg) { <span style='color:blue'>return</span> std::string(<span
style='color:#A31515'>"foo(int) Called"</span>); }<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:Consolas'>std::string foo_double(<span style='color:blue'>double</span>
arg) { <span style='color:blue'>return</span> std::string(<span
style='color:#A31515'>"foo(double) Called"</span>); }<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:Consolas'>std::string foo_bool (<span style='color:blue'>bool</span>
arg) { <span style='color:blue'>return</span> std::string(<span
style='color:#A31515'>"foo(bool) Called"</span>); }<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:Consolas'>BOOST_PYTHON_MODULE(busybox)<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:Consolas'>{<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:Consolas'> bp::def(<span style='color:#A31515'>"foo"</span>,
foo_double);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:Consolas'> bp::def(<span style='color:#A31515'>"foo"</span>,
foo_bool);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:Consolas'> bp::def(<span style='color:#A31515'>"foo"</span>,
foo_int);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:Consolas'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:Consolas'>}</span><o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>python Interpreter: <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Python 2.6.1 (r261:67517, Dec 4 2008, 16:51:00) [MSC
v.1500 32 bit (Intel)] on win32<o:p></o:p></p>
<p class=MsoNormal>Type "help", "copyright",
"credits" or "license" for more information.<o:p></o:p></p>
<p class=MsoNormal>>>> import busybox<o:p></o:p></p>
<p class=MsoNormal>>>> busybox.foo(5.0)<o:p></o:p></p>
<p class=MsoNormal>'foo(double) Called'<o:p></o:p></p>
<p class=MsoNormal>>>> busybox.foo(5)<o:p></o:p></p>
<p class=MsoNormal>'foo(int) Called'<o:p></o:p></p>
<p class=MsoNormal>>>> busybox.foo(True)<o:p></o:p></p>
<p class=MsoNormal>'foo(int) Called'<o:p></o:p></p>
<p class=MsoNormal>>>><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Note that the int overload is called for a bool argument. If
I change the order of the defs in the cpp file I can effect this to some
extent. If I put the def for the bool overload last, IT gets called for both int
and bool parameters. If I put the double override last, that override gets
called for ALL 3 CALLS regardless of what is passed.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Now the order sensitivity is annoying, but I can figure out
how to make it work right, and then comment the dickens out of the code. The
real killer is that there does not seem to be any way to force BP to
differentiate between a bool and an int. The only thing that has worked is to
apply a name skew (ie: bp::def("foo_bool", foo_bool);). This works,
but the users carp at me for changing the interface from the underlying library.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Is there a better work around?<o:p></o:p></p>
<p class=MsoNormal>Is this a bug? <o:p></o:p></p>
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