mirror of
https://github.com/pybind/pybind11.git
synced 2024-11-26 23:22:01 +00:00
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
|
|
from __future__ import print_function
|
|
import sys
|
|
sys.path.append('.')
|
|
|
|
from example.issues import print_cchar, print_char
|
|
from example.issues import DispatchIssue, dispatch_issue_go
|
|
from example.issues import Placeholder, return_vec_of_reference_wrapper
|
|
from example.issues import iterator_passthrough
|
|
from example.issues import ElementList, ElementA, print_element
|
|
from example.issues import expect_float, expect_int
|
|
from example.issues import A, call_f
|
|
import gc
|
|
|
|
print_cchar("const char *")
|
|
print_char('c')
|
|
|
|
|
|
class PyClass1(DispatchIssue):
|
|
def dispatch(self):
|
|
print("Yay..")
|
|
|
|
|
|
class PyClass2(DispatchIssue):
|
|
def dispatch(self):
|
|
try:
|
|
super(PyClass2, self).dispatch()
|
|
except Exception as e:
|
|
print("Failed as expected: " + str(e))
|
|
p = PyClass1()
|
|
dispatch_issue_go(p)
|
|
|
|
b = PyClass2()
|
|
dispatch_issue_go(b)
|
|
|
|
print(return_vec_of_reference_wrapper(Placeholder(4)))
|
|
|
|
print(list(iterator_passthrough(iter([3, 5, 7, 9, 11, 13, 15]))))
|
|
|
|
el = ElementList()
|
|
for i in range(10):
|
|
el.add(ElementA(i))
|
|
gc.collect()
|
|
for i, v in enumerate(el.get()):
|
|
print("%i==%i, " % (i, v.value()), end='')
|
|
print()
|
|
|
|
try:
|
|
print_element(None)
|
|
except Exception as e:
|
|
print("Failed as expected: " + str(e))
|
|
|
|
try:
|
|
print(expect_int(5.2))
|
|
except Exception as e:
|
|
print("Failed as expected: " + str(e))
|
|
|
|
print(expect_float(12))
|
|
|
|
class B(A):
|
|
def __init__(self):
|
|
super(B, self).__init__()
|
|
|
|
def f(self):
|
|
print("In python f()")
|
|
|
|
print("C++ version")
|
|
a = A()
|
|
call_f(a)
|
|
|
|
print("Python version")
|
|
b = B()
|
|
call_f(b)
|
|
|