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< h1 > 6. Encapsulating DbU< a class = "headerlink" href = "#encapsulating-dbu" title = "Permalink to this headline" > ¶< / a > < / h1 >
< p > While < tt class = "docutils literal" > < span class = "pre" > Hurricane::DbU< / span > < / tt > is a class, the < tt class = "docutils literal" > < span class = "pre" > Hurricane::DbU::Unit< / span > < / tt > is only
a < tt class = "docutils literal" > < span class = "pre" > typedef< / span > < / tt > over < tt class = "docutils literal" > < span class = "pre" > uint64_t< / span > < / tt > . The < tt class = "docutils literal" > < span class = "pre" > DbU< / span > < / tt > class only provides a set of
static methods to manipulate and convert to and from other units.
At Python level, < tt class = "docutils literal" > < span class = "pre" > DbU::Unit< / span > < / tt > will be stored in plain < tt class = "docutils literal" > < span class = "pre" > long< / span > < span class = "pre" > long< / span > < / tt > .< / p >
< p > When a < tt class = "docutils literal" > < span class = "pre" > DbU::Unit< / span > < / tt > argument is expected in a Python functions, just use
the < tt class = "docutils literal" > < span class = "pre" > DbU::Unit< / span > < span class = "pre" > PyAny_AsLong(< / span > < span class = "pre" > PyObject*< / span > < span class = "pre" > )< / span > < / tt > function to convert it.< / p >
< p > For example, if we explicit the expension of:< / p >
< div class = "highlight-c++" > < div class = "highlight" > < pre > < 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 >
< / pre > < / div >
< / div >
< p > < / p >
< p > We would get:< / p >
< div class = "highlight-c++" > < div class = "highlight" > < pre > < span class = "k" > static< / span > < span class = "n" > PyObject< / span > < span class = "o" > *< / span > < span class = "n" > PyPoint_setX< / 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 = "p" > {< / span >
< span class = "n" > Point< / span > < span class = "o" > *< / span > < span class = "n" > cobject< / span > < span class = "o" > =< / span > < span class = "k" > static_cast< / span > < span class = "o" > < < / span > < span class = "n" > Point< / span > < span class = "o" > *> < / span > < span class = "p" > (< / span > < span class = "n" > self< / span > < span class = "o" > -> < / span > < span class = "n" > _object< / span > < span class = "p" > );< / span >
< span class = "k" > if< / span > < span class = "p" > (< / span > < span class = "n" > cobject< / span > < span class = "o" > ==< / span > < span class = "nb" > NULL< / span > < span class = "p" > )< / span > < span class = "p" > {< / span >
< span class = "n" > PyErr_SetString< / span > < span class = "p" > (< / span > < span class = "n" > ProxyError< / span >
< span class = "p" > ,< / span > < span class = "s" > " Attempt to call Point.setX() on an unbound Hurricane object" < / 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" > 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 = "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:Point.setX()" < / span > < span class = "p" > ,< / span > < span class = "o" > & < / span > < span class = "n" > arg0< / span > < span class = "p" > ))< / span >
< span class = "k" > return< / span > < span class = "p" > (< / span > < span class = "nb" > NULL< / span > < span class = "p" > );< / span >
< span class = "n" > cobject< / span > < span class = "o" > -> < / span > < span class = "n" > setX< / span > < span class = "p" > (< / span > < span class = "n" > Isobar< / span > < span class = "o" > ::< / span > < span class = "n" > PyAny_AsLong< / span > < span class = "p" > (< / span > < span class = "n" > arg0< / span > < span class = "p" > )< / span > < span class = "p" > );< / span >
< span class = "n" > HCATCH< / span >
< span class = "n" > Py_RETURN_NONE< / span > < span class = "p" > ;< / span >
< span class = "p" > }< / span >
< / pre > < / div >
< / div >
< p > For the other way around, use < tt class = "docutils literal" > < span class = "pre" > PyObject*< / span > < span class = "pre" > PyDbU_FromLong(< / span > < span class = "pre" > DbU::Unit< / span > < span class = "pre" > )< / span > < / tt > .< / p >
< div class = "highlight-c++" > < div class = "highlight" > < pre > < 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 >
< / pre > < / div >
< / div >
< p > We would get:< / p >
< div class = "highlight-c++" > < div class = "highlight" > < pre > < span class = "k" > static< / span > < span class = "n" > PyObject< / span > < span class = "o" > *< / span > < span class = "n" > PyPoint_GetX< / 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 = "p" > {< / span >
< span class = "n" > Point< / span > < span class = "o" > *< / span > < span class = "n" > cobject< / span > < span class = "o" > =< / span > < span class = "k" > static_cast< / span > < span class = "o" > < < / span > < span class = "n" > Point< / span > < span class = "o" > *> < / span > < span class = "p" > (< / span > < span class = "n" > self< / span > < span class = "o" > -> < / span > < span class = "n" > _object< / span > < span class = "p" > );< / span >
< span class = "k" > if< / span > < span class = "p" > (< / span > < span class = "n" > cobject< / span > < span class = "o" > ==< / span > < span class = "nb" > NULL< / span > < span class = "p" > )< / span > < span class = "p" > {< / span >
< span class = "n" > PyErr_SetString< / span > < span class = "p" > (< / span > < span class = "n" > ProxyError< / span >
< span class = "p" > ,< / span > < span class = "s" > " Attempt to call Point.getX() on an unbound Hurricane object" < / 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" > return< / span > < span class = "n" > Isobar< / span > < span class = "o" > ::< / span > < span class = "n" > PyDbU_FromLong< / span > < span class = "p" > (< / span > < span class = "n" > cobject< / span > < span class = "o" > -> < / span > < span class = "n" > getX< / span > < span class = "p" > ());< / span >
< span class = "p" > }< / span >
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