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https://github.com/pybind/pybind11.git
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86d825f330
Sergey Lyskov pointed out that the trampoline mechanism used to override
virtual methods from within Python caused unnecessary overheads when
instantiating the original (i.e. non-extended) class.
This commit removes this inefficiency, but some syntax changes were
needed to achieve this. Projects using this features will need to make a
few changes:
In particular, the example below shows the old syntax to instantiate a
class with a trampoline:
class_<TrampolineClass>("MyClass")
.alias<MyClass>()
....
This is what should be used now:
class_<MyClass, std::unique_ptr<MyClass, TrampolineClass>("MyClass")
....
Importantly, the trampoline class is now specified as the *third*
argument to the class_ template, and the alias<..>() call is gone. The
second argument with the unique pointer is simply the default holder
type used by pybind11.
75 lines
1.6 KiB
Python
75 lines
1.6 KiB
Python
#!/usr/bin/env python
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from __future__ import print_function
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import sys
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sys.path.append('.')
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from example.issues import print_cchar, print_char
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from example.issues import DispatchIssue, dispatch_issue_go
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from example.issues import Placeholder, return_vec_of_reference_wrapper
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from example.issues import iterator_passthrough
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from example.issues import ElementList, ElementA, print_element
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from example.issues import expect_float, expect_int
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from example.issues import A, call_f
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import gc
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print_cchar("const char *")
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print_char('c')
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class PyClass1(DispatchIssue):
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def dispatch(self):
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print("Yay..")
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class PyClass2(DispatchIssue):
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def dispatch(self):
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try:
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super(PyClass2, self).dispatch()
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except Exception as e:
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print("Failed as expected: " + str(e))
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p = PyClass1()
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dispatch_issue_go(p)
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b = PyClass2()
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dispatch_issue_go(b)
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print(return_vec_of_reference_wrapper(Placeholder(4)))
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print(list(iterator_passthrough(iter([3, 5, 7, 9, 11, 13, 15]))))
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el = ElementList()
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for i in range(10):
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el.add(ElementA(i))
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gc.collect()
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for i, v in enumerate(el.get()):
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print("%i==%i, " % (i, v.value()), end='')
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print()
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try:
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print_element(None)
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except Exception as e:
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print("Failed as expected: " + str(e))
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try:
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print(expect_int(5.2))
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except Exception as e:
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print("Failed as expected: " + str(e))
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print(expect_float(12))
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class B(A):
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def __init__(self):
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super(B, self).__init__()
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def f(self):
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print("In python f()")
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print("C++ version")
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a = A()
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call_f(a)
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print("Python version")
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b = B()
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call_f(b)
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