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3f589379ec
This commit rewrites the examples that look for constructor/destructor calls to do so via static variable tracking rather than output parsing. The added ConstructorStats class provides methods to keep track of constructors and destructors, number of default/copy/move constructors, and number of copy/move assignments. It also provides a mechanism for storing values (e.g. for value construction), and then allows all of this to be checked at the end of a test by getting the statistics for a C++ (or python mapping) class. By not relying on the precise pattern of constructions/destructions, but rather simply ensuring that every construction is matched with a destruction on the same object, we ensure that everything that gets created also gets destroyed as expected. This replaces all of the various "std::cout << whatever" code in constructors/destructors with `print_created(this)`/`print_destroyed(this)`/etc. functions which provide similar output, but now has a unified format across the different examples, including a new ### prefix that makes mixed example output and lifecycle events easier to distinguish. With this change, relaxed mode is no longer needed, which enables testing for proper destruction under MSVC, and under any other compiler that generates code calling extra constructors, or optimizes away any constructors. GCC/clang are used as the baseline for move constructors; the tests are adapted to allow more move constructors to be evoked (but other types are constructors much have matching counts). This commit also disables output buffering of tests, as the buffering sometimes results in C++ output ending up in the middle of python output (or vice versa), depending on the OS/python version.
59 lines
1.8 KiB
C++
59 lines
1.8 KiB
C++
/*
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example/example-modules.cpp -- nested modules, importing modules, and
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internal references
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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 "constructor-stats.h"
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void submodule_func() {
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std::cout << "submodule_func()" << std::endl;
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}
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class A {
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public:
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A(int v) : v(v) { print_created(this, v); }
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~A() { print_destroyed(this); }
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A(const A&) { print_copy_created(this); }
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A& operator=(const A ©) { print_copy_assigned(this); v = copy.v; return *this; }
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std::string toString() { return "A[" + std::to_string(v) + "]"; }
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private:
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int v;
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};
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class B {
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public:
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B() { print_default_created(this); }
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~B() { print_destroyed(this); }
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B(const B&) { print_copy_created(this); }
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B& operator=(const B ©) { print_copy_assigned(this); a1 = copy.a1; a2 = copy.a2; return *this; }
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A &get_a1() { return a1; }
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A &get_a2() { return a2; }
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A a1{1};
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A a2{2};
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};
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void init_ex_modules(py::module &m) {
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py::module m_sub = m.def_submodule("submodule");
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m_sub.def("submodule_func", &submodule_func);
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py::class_<A>(m_sub, "A")
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.def(py::init<int>())
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.def("__repr__", &A::toString);
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py::class_<B>(m_sub, "B")
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.def(py::init<>())
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.def("get_a1", &B::get_a1, "Return the internal A 1", py::return_value_policy::reference_internal)
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.def("get_a2", &B::get_a2, "Return the internal A 2", py::return_value_policy::reference_internal)
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.def_readwrite("a1", &B::a1) // def_readonly uses an internal reference return policy by default
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.def_readwrite("a2", &B::a2);
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m.attr("OD") = py::module::import("collections").attr("OrderedDict");
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}
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