mirror of
https://github.com/pybind/pybind11.git
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b3f3d79f4c
This renames example files from `exampleN` to `example-description`.
Specifically, the following renaming is applied:
example1 -> example-methods-and-attributes
example2 -> example-python-types
example3 -> example-operator-overloading
example4 -> example-constants-and-functions
example5 -> example-callbacks (*)
example6 -> example-sequence-and-iterators
example7 -> example-buffers
example8 -> example-custom-ref-counting
example9 -> example-modules
example10 -> example-numpy-vectorize
example11 -> example-arg-keywords-and-defaults
example12 -> example-virtual-functions
example13 -> example-keep-alive
example14 -> example-opaque-types
example15 -> example-pickling
example16 -> example-inheritance
example17 -> example-stl-binders
example18 -> example-eval
example19 -> example-custom-exceptions
* the inheritance parts of example5 are moved into example-inheritance
(previously example16), and the remainder is left as example-callbacks.
This commit also renames the internal variables ("Example1",
"Example2", "Example4", etc.) into non-numeric names ("ExampleMandA",
"ExamplePythonTypes", "ExampleWithEnum", etc.) to correspond to the
file renaming.
The order of tests is preserved, but this can easily be changed if
there is some more natural ordering by updating the list in
examples/CMakeLists.txt.
99 lines
3.1 KiB
C++
99 lines
3.1 KiB
C++
/*
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example/example-virtual-functions.cpp -- overriding virtual functions from Python
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Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
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All rights reserved. Use of this source code is governed by a
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BSD-style license that can be found in the LICENSE file.
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*/
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#include "example.h"
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#include <pybind11/functional.h>
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/* This is an example class that we'll want to be able to extend from Python */
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class ExampleVirt {
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public:
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ExampleVirt(int state) : state(state) {
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cout << "Constructing ExampleVirt.." << endl;
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}
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~ExampleVirt() {
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cout << "Destructing ExampleVirt.." << endl;
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}
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virtual int run(int value) {
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std::cout << "Original implementation of ExampleVirt::run(state=" << state
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<< ", value=" << value << ")" << std::endl;
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return state + value;
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}
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virtual bool run_bool() = 0;
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virtual void pure_virtual() = 0;
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private:
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int state;
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};
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/* This is a wrapper class that must be generated */
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class PyExampleVirt : public ExampleVirt {
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public:
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using ExampleVirt::ExampleVirt; /* Inherit constructors */
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virtual int run(int value) {
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/* Generate wrapping code that enables native function overloading */
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PYBIND11_OVERLOAD(
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int, /* Return type */
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ExampleVirt, /* Parent class */
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run, /* Name of function */
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value /* Argument(s) */
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);
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}
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virtual bool run_bool() {
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PYBIND11_OVERLOAD_PURE(
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bool, /* Return type */
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ExampleVirt, /* Parent class */
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run_bool, /* Name of function */
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/* This function has no arguments. The trailing comma
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in the previous line is needed for some compilers */
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);
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}
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virtual void pure_virtual() {
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PYBIND11_OVERLOAD_PURE(
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void, /* Return type */
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ExampleVirt, /* Parent class */
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pure_virtual, /* Name of function */
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/* This function has no arguments. The trailing comma
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in the previous line is needed for some compilers */
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);
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}
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};
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int runExampleVirt(ExampleVirt *ex, int value) {
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return ex->run(value);
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}
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bool runExampleVirtBool(ExampleVirt* ex) {
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return ex->run_bool();
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}
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void runExampleVirtVirtual(ExampleVirt *ex) {
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ex->pure_virtual();
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}
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void init_ex_virtual_functions(py::module &m) {
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/* Important: indicate the trampoline class PyExampleVirt using the third
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argument to py::class_. The second argument with the unique pointer
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is simply the default holder type used by pybind11. */
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py::class_<ExampleVirt, std::unique_ptr<ExampleVirt>, PyExampleVirt>(m, "ExampleVirt")
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.def(py::init<int>())
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/* Reference original class in function definitions */
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.def("run", &ExampleVirt::run)
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.def("run_bool", &ExampleVirt::run_bool)
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.def("pure_virtual", &ExampleVirt::pure_virtual);
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m.def("runExampleVirt", &runExampleVirt);
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m.def("runExampleVirtBool", &runExampleVirtBool);
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m.def("runExampleVirtVirtual", &runExampleVirtVirtual);
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}
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