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< h1 > 5. Case 3 - Non-DBo Standalone Classe< a class = "headerlink" href = "#case-3-non-dbo-standalone-classe" title = "Permalink to this headline" > ¶< / a > < / h1 >
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< p > Let’ s have a look at the encapsulation of < code class = "docutils literal" > < span class = "pre" > Hurricane::Point< / span > < / code > .< / p >
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< p > Non-BDo derived classes do not support the bi-directionnal communication.
So each Python object is associated with one C++ object. The C++ object
is created and deleted along with the Python one. This behavior implies
that the C++ object is < em > copy constructible< / em > (which should be the case).< / p >
< div class = "section" id = "class-header" >
< h2 > 5.1 Class Header< a class = "headerlink" href = "#class-header" title = "Permalink to this headline" > ¶< / a > < / h2 >
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< p > Changes from < a class = "reference internal" href = "DBoStandalone.html#class-associated-header-file" > < span class = "std std-ref" > 3.1 Class Associated Header File< / span > < / a > :< / p >
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< ul class = "simple" >
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< li > There is no < code class = "docutils literal" > < span class = "pre" > PyPoint_Link()< / span > < / code > function, as it’ s related to the
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bi-directional communication mechanism.< / li >
< / ul >
< div class = "admonition note" >
< p class = "first admonition-title" > Note< / p >
< p class = "last" > < strong > About the _object attribute< / strong > of the PyPoint. As the C++ object life span
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(< code class = "docutils literal" > < span class = "pre" > Point< / span > < / code > ) is linked to the Python (< code class = "docutils literal" > < span class = "pre" > PyPoint< / span > < / code > ) one, we may have used a
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value instead of a pointer. It is best to keep a pointer as the macros
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written for < code class = "docutils literal" > < span class = "pre" > DBo< / span > < / code > derived classes will remain usables.< / p >
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< / div >
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< div class = "highlight-c++" > < div class = "highlight" > < pre > < span > < / span > < span class = "cp" > #ifndef ISOBAR_PY_POINT_H< / span >
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< span class = "cp" > #define ISOBAR_PY_POINT_H< / span >
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< span class = "cp" > #include< / span > < span class = "cpf" > " hurricane/isobar/PyHurricane.h" < / span > < span class = "cp" > < / span >
< span class = "cp" > #include< / span > < span class = "cpf" > " hurricane/Point.h" < / span > < span class = "cp" > < / span >
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< span class = "k" > namespace< / span > < span class = "n" > Isobar< / span > < span class = "p" > {< / span >
< span class = "k" > extern< / span > < span class = "s" > " C" < / span > < span class = "p" > {< / span >
< span class = "k" > typedef< / span > < span class = "k" > struct< / span > < span class = "p" > {< / span >
< span class = "n" > PyObject_HEAD< / span >
< span class = "n" > Hurricane< / span > < span class = "o" > ::< / span > < span class = "n" > Point< / span > < span class = "o" > *< / span > < span class = "n" > _object< / span > < span class = "p" > ;< / span >
< span class = "p" > }< / span > < span class = "n" > PyPoint< / span > < span class = "p" > ;< / span >
< span class = "k" > extern< / span > < span class = "n" > PyTypeObject< / span > < span class = "n" > PyTypePoint< / span > < span class = "p" > ;< / span >
< span class = "k" > extern< / span > < span class = "n" > PyMethodDef< / span > < span class = "n" > PyPoint_Methods< / span > < span class = "p" > [];< / span >
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< span class = "k" > extern< / span > < span class = "kt" > void< / span > < span class = "nf" > PyPoint_LinkPyType< / span > < span class = "p" > ();< / span >
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< span class = "cp" > #define IsPyPoint(v) ( (v)-> ob_type == & PyTypePoint )< / span >
< span class = "cp" > #define PYPOINT(v) ( (PyPoint*)(v) )< / span >
< span class = "cp" > #define PYPOINT_O(v) ( PYPOINT(v)-> _object )< / span >
< span class = "p" > }< / span > < span class = "c1" > // extern " C" .< / span >
< span class = "p" > }< / span > < span class = "c1" > // Isobar namespace.< / span >
< span class = "cp" > #endif < / span > < span class = "c1" > // ISOBAR_PY_POINT_H< / span >
< / pre > < / div >
< / div >
< p > < / p >
< / div >
< div class = "section" id = "class-file" >
< h2 > 5.2 Class File< a class = "headerlink" href = "#class-file" title = "Permalink to this headline" > ¶< / a > < / h2 >
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< p > Changes from < a class = "reference internal" href = "DBoStandalone.html#class-associated-file" > < span class = "std std-ref" > 3.2 Class Associated File< / span > < / a > :< / p >
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< ul class = "simple" >
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< li > As there is no < code class = "docutils literal" > < span class = "pre" > PyPoint_Link()< / span > < / code > function, there is no call to any
flavor of the < code class = "docutils literal" > < span class = "pre" > DBoLinkcreatemethod()< / span > < / code > macro (obvious as it’ s < em > not< / em >
a < code class = "docutils literal" > < span class = "pre" > DBo< / span > < / code > ).< / li >
< li > To use the standard Python constructor, we have to define < code class = "docutils literal" > < span class = "pre" > PyPoint_NEW()< / span > < / code >
and < code class = "docutils literal" > < span class = "pre" > PyPoint_Init()< / span > < / code > functions, I’ m not absolutely certain that the later
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needs to be defined (that part is still not clear to me from the Python doc).< / li >
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< li > As it’ s not a < code class = "docutils literal" > < span class = "pre" > DBo< / span > < / code > there is no < code class = "docutils literal" > < span class = "pre" > destroy()< / span > < / code > method, so no call to
< code class = "docutils literal" > < span class = "pre" > DirectDestroyMethod()< / span > < / code > < / li >
< li > Lastly, as this object has a < code class = "docutils literal" > < span class = "pre" > PyPoint_NEW()< / span > < / code > (field < code class = "docutils literal" > < span class = "pre" > tp_new< / span > < / code > ) and
a < code class = "docutils literal" > < span class = "pre" > PyPoint_Init()< / span > < / code > (field < code class = "docutils literal" > < span class = "pre" > tp_init< / span > < / code > ) we have to use the macro
< code class = "docutils literal" > < span class = "pre" > PyTypeObjectLinkPyTypeNewInit()< / span > < / code > to define < code class = "docutils literal" > < span class = "pre" > PyPoint_LinkPyType()< / span > < / code > .< / li >
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< / ul >
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< div class = "highlight-c++" > < div class = "highlight" > < pre > < span > < / span > < span class = "cp" > #include< / span > < span class = "cpf" > " hurricane/isobar/PyPoint.h" < / span > < span class = "cp" > < / span >
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< span class = "k" > namespace< / span > < span class = "n" > Isobar< / span > < span class = "p" > {< / span >
< span class = "k" > using< / span > < span class = "k" > namespace< / span > < span class = "n" > Hurricane< / span > < span class = "p" > ;< / span >
< span class = "k" > extern< / span > < span class = "s" > " C" < / span > < span class = "p" > {< / span >
< span class = "cp" > #define METHOD_HEAD(function) GENERIC_METHOD_HEAD(Point,point,function)< / span >
< span class = "cp" > #if defined(__PYTHON_MODULE__)< / span >
< span class = "k" > static< / span > < span class = "n" > PyObject< / span > < span class = "o" > *< / span > < span class = "n" > PyPoint_NEW< / span > < span class = "p" > (< / span > < span class = "n" > PyObject< / span > < span class = "o" > *< / span > < span class = "n" > module< / span > < span class = "p" > ,< / span > < span class = "n" > PyObject< / span > < span class = "o" > *< / span > < span class = "n" > args< / span > < span class = "p" > )< / span >
< span class = "p" > {< / span >
< span class = "n" > Point< / span > < span class = "o" > *< / span > < span class = "n" > point< / span > < span class = "o" > =< / span > < span class = "nb" > NULL< / span > < span class = "p" > ;< / span >
< span class = "n" > HTRY< / span >
< span class = "n" > PyObject< / span > < span class = "o" > *< / span > < span class = "n" > arg0< / span > < span class = "o" > =< / span > < span class = "nb" > NULL< / span > < span class = "p" > ;< / span >
< span class = "n" > PyObject< / span > < span class = "o" > *< / span > < span class = "n" > arg1< / span > < span class = "o" > =< / span > < span class = "nb" > NULL< / span > < span class = "p" > ;< / span >
< span class = "n" > __cs< / span > < span class = "p" > .< / span > < span class = "n" > init< / span > < span class = "p" > (< / span > < span class = "s" > " Point.Point" < / span > < span class = "p" > );< / span >
< span class = "k" > if< / span > < span class = "p" > (< / span > < span class = "n" > not< / span > < span class = "n" > PyArg_ParseTuple< / span > < span class = "p" > (< / span > < span class = "n" > args< / span > < span class = "p" > ,< / span > < span class = "s" > " |O& O& :Point.Point" < / span >
< span class = "p" > ,< / span > < span class = "n" > Converter< / span > < span class = "p" > ,< / span > < span class = "o" > & < / span > < span class = "n" > arg0< / span >
< span class = "p" > ,< / span > < span class = "n" > Converter< / span > < span class = "p" > ,< / span > < span class = "o" > & < / span > < span class = "n" > arg1< / span > < span class = "p" > ))< / span > < span class = "p" > {< / span >
< span class = "n" > PyErr_SetString< / span > < span class = "p" > (< / span > < span class = "n" > ConstructorError< / span >
< span class = "p" > ,< / span > < span class = "s" > " invalid number of parameters for Point constructor." < / span > < span class = "p" > );< / span >
< span class = "k" > return< / span > < span class = "nb" > NULL< / span > < span class = "p" > ;< / span >
< span class = "p" > }< / span >
< span class = "k" > if< / span > < span class = "p" > (< / span > < span class = "n" > __cs< / span > < span class = "p" > .< / span > < span class = "n" > getObjectIds< / span > < span class = "p" > ()< / span > < span class = "o" > ==< / span > < span class = "s" > " " < / span > < span class = "p" > )< / span >
< span class = "p" > {< / span > < span class = "n" > point< / span > < span class = "o" > =< / span > < span class = "k" > new< / span > < span class = "n" > Point< / span > < span class = "p" > ());< / span > < span class = "p" > }< / span >
< span class = "k" > else< / span > < span class = "k" > if< / span > < span class = "p" > (< / span > < span class = "n" > __cs< / span > < span class = "p" > .< / span > < span class = "n" > getObjectIds< / span > < span class = "p" > ()< / span > < span class = "o" > ==< / span > < span class = "s" > " :point" < / span > < span class = "p" > )< / span >
< span class = "p" > {< / span > < span class = "n" > point< / span > < span class = "o" > =< / span > < span class = "k" > new< / span > < span class = "n" > Point< / span > < span class = "p" > (< / span > < span class = "o" > *< / span > < span class = "n" > PYPOINT_O< / span > < span class = "p" > (< / span > < span class = "n" > arg0< / span > < span class = "p" > )< / span > < span class = "p" > );< / span > < span class = "p" > }< / span >
< span class = "k" > else< / span > < span class = "k" > if< / span > < span class = "p" > (< / span > < span class = "n" > __cs< / span > < span class = "p" > .< / span > < span class = "n" > getObjectIds< / span > < span class = "p" > ()< / span > < span class = "o" > ==< / span > < span class = "s" > " :int:int" < / span > < span class = "p" > )< / span >
< span class = "p" > {< / span > < span class = "n" > point< / span > < span class = "o" > =< / span > < span class = "k" > new< / span > < span class = "n" > Point< / span > < span class = "p" > (< / span > < span class = "n" > PyAny_AsLong< / span > < span class = "p" > (< / span > < span class = "n" > arg0< / span > < span class = "p" > ),< / span > < span class = "n" > PyAny_AsLong< / span > < span class = "p" > (< / span > < span class = "n" > arg1< / span > < span class = "p" > )< / span > < span class = "p" > );< / span > < span class = "p" > }< / span >
< span class = "k" > else< / span > < span class = "p" > {< / span >
< span class = "n" > PyErr_SetString< / span > < span class = "p" > (< / span > < span class = "n" > ConstructorError< / span >
< span class = "p" > ,< / span > < span class = "s" > " invalid number of parameters for Point constructor." < / span > < span class = "p" > );< / span >
< span class = "k" > return< / span > < span class = "nb" > NULL< / span > < span class = "p" > ;< / span >
< span class = "p" > }< / span >
< span class = "n" > PyPoint< / span > < span class = "o" > *< / span > < span class = "n" > pyPoint< / span > < span class = "o" > =< / span > < span class = "n" > PyObject_NEW< / span > < span class = "p" > (< / span > < span class = "n" > PyPoint< / span > < span class = "p" > ,< / span > < span class = "o" > & < / span > < span class = "n" > PyTypePoint< / span > < span class = "p" > );< / span >
< span class = "k" > if< / span > < span class = "p" > (< / span > < span class = "n" > pyPoint< / span > < span class = "o" > ==< / span > < span class = "nb" > NULL< / span > < span class = "p" > )< / span > < span class = "p" > {< / span > < span class = "k" > delete< / span > < span class = "n" > point< / span > < span class = "p" > ;< / span > < span class = "k" > return< / span > < span class = "nb" > NULL< / span > < span class = "p" > ;< / span > < span class = "p" > }< / span >
< span class = "n" > pyPoint< / span > < span class = "o" > -> < / span > < span class = "n" > _object< / span > < span class = "o" > =< / span > < span class = "n" > point< / span > < span class = "p" > ;< / span >
< span class = "n" > HCATCH< / span >
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< span class = "nf" > return< / span > < span class = "p" > (< / span > < span class = "n" > PyObject< / span > < span class = "o" > *< / span > < span class = "p" > )< / span > < span class = "n" > pyPoint< / span > < span class = "p" > ;< / span >
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< span class = "p" > }< / span >
< span class = "k" > static< / span > < span class = "kt" > int< / span > < span class = "n" > PyPoint_Init< / span > < span class = "p" > (< / span > < span class = "n" > PyPoint< / span > < span class = "o" > *< / span > < span class = "n" > self< / span > < span class = "p" > ,< / span > < span class = "n" > PyObject< / span > < span class = "o" > *< / span > < span class = "n" > args< / span > < span class = "p" > ,< / span > < span class = "n" > PyObject< / span > < span class = "o" > *< / span > < span class = "n" > kwargs< / span > < span class = "p" > )< / span >
< span class = "p" > {< / span > < span class = "k" > return< / span > < span class = "mi" > 0< / span > < span class = "p" > ;< / span > < span class = "p" > }< / span >
< span class = "n" > DirectGetLongAttribute< / span > < span class = "p" > (< / span > < span class = "n" > PyPoint_getX< / span > < span class = "p" > ,< / span > < span class = "n" > getX< / span > < span class = "p" > ,< / span > < span class = "n" > PyPoint< / span > < span class = "p" > ,< / span > < span class = "n" > Point< / span > < span class = "p" > )< / span >
< span class = "n" > DirectGetLongAttribute< / span > < span class = "p" > (< / span > < span class = "n" > PyPoint_getY< / span > < span class = "p" > ,< / span > < span class = "n" > getY< / span > < span class = "p" > ,< / span > < span class = "n" > PyPoint< / span > < span class = "p" > ,< / span > < span class = "n" > Point< / span > < span class = "p" > )< / span >
< span class = "n" > DirectSetLongAttribute< / span > < span class = "p" > (< / span > < span class = "n" > PyPoint_SetX< / span > < span class = "p" > ,< / span > < span class = "n" > setX< / span > < span class = "p" > ,< / span > < span class = "n" > PyPoint< / span > < span class = "p" > ,< / span > < span class = "n" > Point< / span > < span class = "p" > )< / span >
< span class = "n" > DirectSetLongAttribute< / span > < span class = "p" > (< / span > < span class = "n" > PyPoint_SetY< / span > < span class = "p" > ,< / span > < span class = "n" > setY< / span > < span class = "p" > ,< / span > < span class = "n" > PyPoint< / span > < span class = "p" > ,< / span > < span class = "n" > Point< / span > < span class = "p" > )< / span >
< span class = "n" > PyMethodDef< / span > < span class = "n" > PyPoint_Methods< / span > < span class = "p" > []< / span > < span class = "o" > =< / span >
< span class = "p" > {< / span > < span class = "p" > {< / span > < span class = "s" > " getX" < / span > < span class = "p" > ,< / span > < span class = "p" > (< / span > < span class = "n" > PyCFunction< / span > < span class = "p" > )< / span > < span class = "n" > PyPoint_getX< / span > < span class = "p" > ,< / span > < span class = "n" > METH_NOARGS< / span >
< span class = "p" > ,< / span > < span class = "s" > " Return the Point X value." < / span > < span class = "p" > }< / span >
< span class = "p" > ,< / span > < span class = "p" > {< / span > < span class = "s" > " getY" < / span > < span class = "p" > ,< / span > < span class = "p" > (< / span > < span class = "n" > PyCFunction< / span > < span class = "p" > )< / span > < span class = "n" > PyPoint_getY< / span > < span class = "p" > ,< / span > < span class = "n" > METH_NOARGS< / span >
< span class = "p" > ,< / span > < span class = "s" > " Return the Point Y value." < / span > < span class = "p" > }< / span >
< span class = "p" > ,< / span > < span class = "p" > {< / span > < span class = "s" > " setX" < / span > < span class = "p" > ,< / span > < span class = "p" > (< / span > < span class = "n" > PyCFunction< / span > < span class = "p" > )< / span > < span class = "n" > PyPoint_SetX< / span > < span class = "p" > ,< / span > < span class = "n" > METH_VARARGS< / span >
< span class = "p" > ,< / span > < span class = "s" > " Modify the Point X value." < / span > < span class = "p" > }< / span >
< span class = "p" > ,< / span > < span class = "p" > {< / span > < span class = "s" > " setY" < / span > < span class = "p" > ,< / span > < span class = "p" > (< / span > < span class = "n" > PyCFunction< / span > < span class = "p" > )< / span > < span class = "n" > PyPoint_SetY< / span > < span class = "p" > ,< / span > < span class = "n" > METH_VARARGS< / span >
< span class = "p" > ,< / span > < span class = "s" > " Modify the Point Y value." < / span > < span class = "p" > }< / span >
< span class = "p" > ,< / span > < span class = "p" > {< / span > < span class = "nb" > NULL< / span > < span class = "p" > ,< / span > < span class = "nb" > NULL< / span > < span class = "p" > ,< / span > < span class = "mi" > 0< / span > < span class = "p" > ,< / span > < span class = "nb" > NULL< / span > < span class = "p" > }< / span > < span class = "cm" > /* sentinel */< / span >
< span class = "p" > };< / span >
< span class = "n" > DirectDeleteMethod< / span > < span class = "p" > (< / span > < span class = "n" > PyPoint_DeAlloc< / span > < span class = "p" > ,< / span > < span class = "n" > PyPoint< / span > < span class = "p" > )< / span >
< span class = "n" > PyTypeObjectLinkPyTypeNewInit< / span > < span class = "p" > (< / span > < span class = "n" > Point< / span > < span class = "p" > )< / span >
< span class = "cp" > #else < / span > < span class = "c1" > // Python Module Code Part.< / span >
< span class = "n" > PyTypeObjectDefinitions< / span > < span class = "p" > (< / span > < span class = "n" > Point< / span > < span class = "p" > )< / span >
< span class = "cp" > #endif < / span > < span class = "c1" > // Shared Library Code Part.< / span >
< span class = "p" > }< / span > < span class = "c1" > // extern " C" .< / span >
< span class = "p" > }< / span > < span class = "c1" > // Isobar namespace.< / span >
< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "id1" >
< h2 > 5.2 Class File< a class = "headerlink" href = "#id1" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > To put it bluntly, there is no difference in the Python module for
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a standalone < code class = "docutils literal" > < span class = "pre" > DBo< / span > < / code > class and a non-< code class = "docutils literal" > < span class = "pre" > DBo< / span > < / code > class.< / p >
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