test_copy_move.cpp
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1 /*
2  tests/test_copy_move_policies.cpp -- 'copy' and 'move' return value policies
3  and related tests
4 
5  Copyright (c) 2016 Ben North <ben@redfrontdoor.org>
6 
7  All rights reserved. Use of this source code is governed by a
8  BSD-style license that can be found in the LICENSE file.
9 */
10 
11 #include <pybind11/stl.h>
12 
13 #include "constructor_stats.h"
14 #include "pybind11_tests.h"
15 
16 #include <type_traits>
17 
18 template <typename derived>
19 struct empty {
20  static const derived &get_one() { return instance_; }
21  static derived instance_;
22 };
23 
24 struct lacking_copy_ctor : public empty<lacking_copy_ctor> {
25  lacking_copy_ctor() = default;
26  lacking_copy_ctor(const lacking_copy_ctor &other) = delete;
27 };
28 
29 template <>
30 lacking_copy_ctor empty<lacking_copy_ctor>::instance_ = {};
31 
32 struct lacking_move_ctor : public empty<lacking_move_ctor> {
33  lacking_move_ctor() = default;
34  lacking_move_ctor(const lacking_move_ctor &other) = delete;
35  lacking_move_ctor(lacking_move_ctor &&other) = delete;
36 };
37 
38 template <>
39 lacking_move_ctor empty<lacking_move_ctor>::instance_ = {};
40 
41 /* Custom type caster move/copy test classes */
42 class MoveOnlyInt {
43 public:
44  MoveOnlyInt() { print_default_created(this); }
45  explicit MoveOnlyInt(int v) : value{v} { print_created(this, value); }
46  MoveOnlyInt(MoveOnlyInt &&m) noexcept {
47  print_move_created(this, m.value);
48  std::swap(value, m.value);
49  }
50  MoveOnlyInt &operator=(MoveOnlyInt &&m) noexcept {
51  print_move_assigned(this, m.value);
52  std::swap(value, m.value);
53  return *this;
54  }
55  MoveOnlyInt(const MoveOnlyInt &) = delete;
56  MoveOnlyInt &operator=(const MoveOnlyInt &) = delete;
57  ~MoveOnlyInt() { print_destroyed(this); }
58 
59  int value;
60 };
61 class MoveOrCopyInt {
62 public:
63  MoveOrCopyInt() { print_default_created(this); }
64  explicit MoveOrCopyInt(int v) : value{v} { print_created(this, value); }
65  MoveOrCopyInt(MoveOrCopyInt &&m) noexcept {
66  print_move_created(this, m.value);
67  std::swap(value, m.value);
68  }
69  MoveOrCopyInt &operator=(MoveOrCopyInt &&m) noexcept {
70  print_move_assigned(this, m.value);
71  std::swap(value, m.value);
72  return *this;
73  }
74  MoveOrCopyInt(const MoveOrCopyInt &c) {
75  print_copy_created(this, c.value);
76  // NOLINTNEXTLINE(cppcoreguidelines-prefer-member-initializer)
77  value = c.value;
78  }
79  MoveOrCopyInt &operator=(const MoveOrCopyInt &c) {
80  print_copy_assigned(this, c.value);
81  value = c.value;
82  return *this;
83  }
84  ~MoveOrCopyInt() { print_destroyed(this); }
85 
86  int value;
87 };
88 class CopyOnlyInt {
89 public:
90  CopyOnlyInt() { print_default_created(this); }
91  explicit CopyOnlyInt(int v) : value{v} { print_created(this, value); }
92  CopyOnlyInt(const CopyOnlyInt &c) {
93  print_copy_created(this, c.value);
94  // NOLINTNEXTLINE(cppcoreguidelines-prefer-member-initializer)
95  value = c.value;
96  }
97  CopyOnlyInt &operator=(const CopyOnlyInt &c) {
98  print_copy_assigned(this, c.value);
99  value = c.value;
100  return *this;
101  }
102  ~CopyOnlyInt() { print_destroyed(this); }
103 
104  int value;
105 };
106 PYBIND11_NAMESPACE_BEGIN(pybind11)
107 PYBIND11_NAMESPACE_BEGIN(detail)
108 template <>
109 struct type_caster<MoveOnlyInt> {
110  PYBIND11_TYPE_CASTER(MoveOnlyInt, const_name("MoveOnlyInt"));
111  bool load(handle src, bool) {
112  value = MoveOnlyInt(src.cast<int>());
113  return true;
114  }
115  static handle cast(const MoveOnlyInt &m, return_value_policy r, handle p) {
116  return pybind11::cast(m.value, r, p);
117  }
118 };
119 
120 template <>
121 struct type_caster<MoveOrCopyInt> {
122  PYBIND11_TYPE_CASTER(MoveOrCopyInt, const_name("MoveOrCopyInt"));
123  bool load(handle src, bool) {
124  value = MoveOrCopyInt(src.cast<int>());
125  return true;
126  }
127  static handle cast(const MoveOrCopyInt &m, return_value_policy r, handle p) {
128  return pybind11::cast(m.value, r, p);
129  }
130 };
131 
132 template <>
133 struct type_caster<CopyOnlyInt> {
134 protected:
135  CopyOnlyInt value;
136 
137 public:
138  static constexpr auto name = const_name("CopyOnlyInt");
139  bool load(handle src, bool) {
140  value = CopyOnlyInt(src.cast<int>());
141  return true;
142  }
143  static handle cast(const CopyOnlyInt &m, return_value_policy r, handle p) {
144  return pybind11::cast(m.value, r, p);
145  }
146  static handle cast(const CopyOnlyInt *src, return_value_policy policy, handle parent) {
147  if (!src) {
148  return none().release();
149  }
150  return cast(*src, policy, parent);
151  }
152  explicit operator CopyOnlyInt *() { return &value; }
153  explicit operator CopyOnlyInt &() { return value; }
154  template <typename T>
155  using cast_op_type = pybind11::detail::cast_op_type<T>;
156 };
157 PYBIND11_NAMESPACE_END(detail)
158 PYBIND11_NAMESPACE_END(pybind11)
159 
160 namespace {
161 
162 py::object CastUnusualOpRefConstRef(const UnusualOpRef &cref) { return py::cast(cref); }
163 py::object CastUnusualOpRefMovable(UnusualOpRef &&mvbl) { return py::cast(std::move(mvbl)); }
164 
165 } // namespace
166 
167 TEST_SUBMODULE(copy_move_policies, m) {
168  // test_lacking_copy_ctor
169  py::class_<lacking_copy_ctor>(m, "lacking_copy_ctor")
170  .def_static("get_one", &lacking_copy_ctor::get_one, py::return_value_policy::copy);
171  // test_lacking_move_ctor
172  py::class_<lacking_move_ctor>(m, "lacking_move_ctor")
173  .def_static("get_one", &lacking_move_ctor::get_one, py::return_value_policy::move);
174 
175  // test_move_and_copy_casts
176  // NOLINTNEXTLINE(performance-unnecessary-value-param)
177  m.def("move_and_copy_casts", [](const py::object &o) {
178  int r = 0;
179  r += py::cast<MoveOrCopyInt>(o).value; /* moves */
180  r += py::cast<MoveOnlyInt>(o).value; /* moves */
181  r += py::cast<CopyOnlyInt>(o).value; /* copies */
182  auto m1(py::cast<MoveOrCopyInt>(o)); /* moves */
183  auto m2(py::cast<MoveOnlyInt>(o)); /* moves */
184  auto m3(py::cast<CopyOnlyInt>(o)); /* copies */
185  r += m1.value + m2.value + m3.value;
186 
187  return r;
188  });
189 
190  // test_move_and_copy_loads
191  m.def("move_only", [](MoveOnlyInt m) { return m.value; });
192  // Changing this breaks the existing test: needs careful review.
193  // NOLINTNEXTLINE(performance-unnecessary-value-param)
194  m.def("move_or_copy", [](MoveOrCopyInt m) { return m.value; });
195  // Changing this breaks the existing test: needs careful review.
196  // NOLINTNEXTLINE(performance-unnecessary-value-param)
197  m.def("copy_only", [](CopyOnlyInt m) { return m.value; });
198  m.def("move_pair",
199  [](std::pair<MoveOnlyInt, MoveOrCopyInt> p) { return p.first.value + p.second.value; });
200  m.def("move_tuple", [](std::tuple<MoveOnlyInt, MoveOrCopyInt, MoveOnlyInt> t) {
201  return std::get<0>(t).value + std::get<1>(t).value + std::get<2>(t).value;
202  });
203  m.def("copy_tuple", [](std::tuple<CopyOnlyInt, CopyOnlyInt> t) {
204  return std::get<0>(t).value + std::get<1>(t).value;
205  });
206  m.def("move_copy_nested",
207  [](std::pair<MoveOnlyInt,
208  std::pair<std::tuple<MoveOrCopyInt, CopyOnlyInt, std::tuple<MoveOnlyInt>>,
209  MoveOrCopyInt>> x) {
210  return x.first.value + std::get<0>(x.second.first).value
211  + std::get<1>(x.second.first).value
212  + std::get<0>(std::get<2>(x.second.first)).value + x.second.second.value;
213  });
214  m.def("move_and_copy_cstats", []() {
215  ConstructorStats::gc();
216  // Reset counts to 0 so that previous tests don't affect later ones:
217  auto &mc = ConstructorStats::get<MoveOrCopyInt>();
218  mc.move_assignments = mc.move_constructions = mc.copy_assignments = mc.copy_constructions
219  = 0;
220  auto &mo = ConstructorStats::get<MoveOnlyInt>();
221  mo.move_assignments = mo.move_constructions = mo.copy_assignments = mo.copy_constructions
222  = 0;
223  auto &co = ConstructorStats::get<CopyOnlyInt>();
224  co.move_assignments = co.move_constructions = co.copy_assignments = co.copy_constructions
225  = 0;
226  py::dict d;
227  d["MoveOrCopyInt"] = py::cast(mc, py::return_value_policy::reference);
228  d["MoveOnlyInt"] = py::cast(mo, py::return_value_policy::reference);
229  d["CopyOnlyInt"] = py::cast(co, py::return_value_policy::reference);
230  return d;
231  });
232 #ifdef PYBIND11_HAS_OPTIONAL
233  // test_move_and_copy_load_optional
234  m.attr("has_optional") = true;
235  m.def("move_optional", [](std::optional<MoveOnlyInt> o) { return o->value; });
236  m.def("move_or_copy_optional", [](std::optional<MoveOrCopyInt> o) { return o->value; });
237  m.def("copy_optional", [](std::optional<CopyOnlyInt> o) { return o->value; });
238  m.def("move_optional_tuple",
239  [](std::optional<std::tuple<MoveOrCopyInt, MoveOnlyInt, CopyOnlyInt>> x) {
240  return std::get<0>(*x).value + std::get<1>(*x).value + std::get<2>(*x).value;
241  });
242 #else
243  m.attr("has_optional") = false;
244 #endif
245 
246  // #70 compilation issue if operator new is not public - simple body added
247  // but not needed on most compilers; MSVC and nvcc don't like a local
248  // struct not having a method defined when declared, since it can not be
249  // added later.
250  struct PrivateOpNew {
251  int value = 1;
252 
253  private:
254  void *operator new(size_t bytes) {
255  void *ptr = std::malloc(bytes);
256  if (ptr) {
257  return ptr;
258  }
259  throw std::bad_alloc{};
260  }
261  };
262  py::class_<PrivateOpNew>(m, "PrivateOpNew").def_readonly("value", &PrivateOpNew::value);
263  m.def("private_op_new_value", []() { return PrivateOpNew(); });
264  m.def(
265  "private_op_new_reference",
266  []() -> const PrivateOpNew & {
267  static PrivateOpNew x{};
268  return x;
269  },
270  py::return_value_policy::reference);
271 
272  // test_move_fallback
273  // #389: rvp::move should fall-through to copy on non-movable objects
274  struct MoveIssue1 {
275  int v;
276  explicit MoveIssue1(int v) : v{v} {}
277  MoveIssue1(const MoveIssue1 &c) = default;
278  MoveIssue1(MoveIssue1 &&) = delete;
279  };
280  py::class_<MoveIssue1>(m, "MoveIssue1")
281  .def(py::init<int>())
282  .def_readwrite("value", &MoveIssue1::v);
283 
284  struct MoveIssue2 {
285  int v;
286  explicit MoveIssue2(int v) : v{v} {}
287  MoveIssue2(MoveIssue2 &&) = default;
288  };
289  py::class_<MoveIssue2>(m, "MoveIssue2")
290  .def(py::init<int>())
291  .def_readwrite("value", &MoveIssue2::v);
292 
293  // #2742: Don't expect ownership of raw pointer to `new`ed object to be transferred with
294  // `py::return_value_policy::move`
295  m.def(
296  "get_moveissue1",
297  [](int i) { return std::unique_ptr<MoveIssue1>(new MoveIssue1(i)); },
298  py::return_value_policy::move);
299  m.def("get_moveissue2", [](int i) { return MoveIssue2(i); }, py::return_value_policy::move);
300 
301  // Make sure that cast from pytype rvalue to other pytype works
302  m.def("get_pytype_rvalue_castissue", [](double i) { return py::float_(i).cast<py::int_>(); });
303 
304  py::class_<UnusualOpRef>(m, "UnusualOpRef");
305  m.def("CallCastUnusualOpRefConstRef",
306  []() { return CastUnusualOpRefConstRef(UnusualOpRef()); });
307  m.def("CallCastUnusualOpRefMovable", []() { return CastUnusualOpRefMovable(UnusualOpRef()); });
308 }
309 
310 /*
311  * Rest of the file:
312  * static_assert based tests for pybind11 adaptations of
313  * std::is_move_constructible, std::is_copy_constructible and
314  * std::is_copy_assignable (no adaptation of std::is_move_assignable).
315  * Difference between pybind11 and std traits: pybind11 traits will also check
316  * the contained value_types.
317  */
318 
319 struct NotMovable {
320  NotMovable() = default;
321  NotMovable(NotMovable const &) = default;
322  NotMovable(NotMovable &&) = delete;
323  NotMovable &operator=(NotMovable const &) = default;
324  NotMovable &operator=(NotMovable &&) = delete;
325 };
326 static_assert(!std::is_move_constructible<NotMovable>::value,
327  "!std::is_move_constructible<NotMovable>::value");
328 static_assert(std::is_copy_constructible<NotMovable>::value,
329  "std::is_copy_constructible<NotMovable>::value");
330 static_assert(!pybind11::detail::is_move_constructible<NotMovable>::value,
331  "!pybind11::detail::is_move_constructible<NotMovable>::value");
332 static_assert(pybind11::detail::is_copy_constructible<NotMovable>::value,
333  "pybind11::detail::is_copy_constructible<NotMovable>::value");
334 static_assert(!std::is_move_assignable<NotMovable>::value,
335  "!std::is_move_assignable<NotMovable>::value");
336 static_assert(std::is_copy_assignable<NotMovable>::value,
337  "std::is_copy_assignable<NotMovable>::value");
338 // pybind11 does not have this
339 // static_assert(!pybind11::detail::is_move_assignable<NotMovable>::value,
340 // "!pybind11::detail::is_move_assignable<NotMovable>::value");
341 static_assert(pybind11::detail::is_copy_assignable<NotMovable>::value,
342  "pybind11::detail::is_copy_assignable<NotMovable>::value");
343 
344 struct NotCopyable {
345  NotCopyable() = default;
346  NotCopyable(NotCopyable const &) = delete;
347  NotCopyable(NotCopyable &&) = default;
348  NotCopyable &operator=(NotCopyable const &) = delete;
349  NotCopyable &operator=(NotCopyable &&) = default;
350 };
351 static_assert(std::is_move_constructible<NotCopyable>::value,
352  "std::is_move_constructible<NotCopyable>::value");
353 static_assert(!std::is_copy_constructible<NotCopyable>::value,
354  "!std::is_copy_constructible<NotCopyable>::value");
355 static_assert(pybind11::detail::is_move_constructible<NotCopyable>::value,
356  "pybind11::detail::is_move_constructible<NotCopyable>::value");
357 static_assert(!pybind11::detail::is_copy_constructible<NotCopyable>::value,
358  "!pybind11::detail::is_copy_constructible<NotCopyable>::value");
359 static_assert(std::is_move_assignable<NotCopyable>::value,
360  "std::is_move_assignable<NotCopyable>::value");
361 static_assert(!std::is_copy_assignable<NotCopyable>::value,
362  "!std::is_copy_assignable<NotCopyable>::value");
363 // pybind11 does not have this
364 // static_assert(!pybind11::detail::is_move_assignable<NotCopyable>::value,
365 // "!pybind11::detail::is_move_assignable<NotCopyable>::value");
366 static_assert(!pybind11::detail::is_copy_assignable<NotCopyable>::value,
367  "!pybind11::detail::is_copy_assignable<NotCopyable>::value");
368 
369 struct NotCopyableNotMovable {
370  NotCopyableNotMovable() = default;
371  NotCopyableNotMovable(NotCopyableNotMovable const &) = delete;
372  NotCopyableNotMovable(NotCopyableNotMovable &&) = delete;
373  NotCopyableNotMovable &operator=(NotCopyableNotMovable const &) = delete;
374  NotCopyableNotMovable &operator=(NotCopyableNotMovable &&) = delete;
375 };
376 static_assert(!std::is_move_constructible<NotCopyableNotMovable>::value,
377  "!std::is_move_constructible<NotCopyableNotMovable>::value");
378 static_assert(!std::is_copy_constructible<NotCopyableNotMovable>::value,
379  "!std::is_copy_constructible<NotCopyableNotMovable>::value");
380 static_assert(!pybind11::detail::is_move_constructible<NotCopyableNotMovable>::value,
381  "!pybind11::detail::is_move_constructible<NotCopyableNotMovable>::value");
382 static_assert(!pybind11::detail::is_copy_constructible<NotCopyableNotMovable>::value,
383  "!pybind11::detail::is_copy_constructible<NotCopyableNotMovable>::value");
384 static_assert(!std::is_move_assignable<NotCopyableNotMovable>::value,
385  "!std::is_move_assignable<NotCopyableNotMovable>::value");
386 static_assert(!std::is_copy_assignable<NotCopyableNotMovable>::value,
387  "!std::is_copy_assignable<NotCopyableNotMovable>::value");
388 // pybind11 does not have this
389 // static_assert(!pybind11::detail::is_move_assignable<NotCopyableNotMovable>::value,
390 // "!pybind11::detail::is_move_assignable<NotCopyableNotMovable>::value");
391 static_assert(!pybind11::detail::is_copy_assignable<NotCopyableNotMovable>::value,
392  "!pybind11::detail::is_copy_assignable<NotCopyableNotMovable>::value");
393 
394 struct NotMovableVector : std::vector<NotMovable> {};
395 static_assert(std::is_move_constructible<NotMovableVector>::value,
396  "std::is_move_constructible<NotMovableVector>::value");
397 static_assert(std::is_copy_constructible<NotMovableVector>::value,
398  "std::is_copy_constructible<NotMovableVector>::value");
399 static_assert(!pybind11::detail::is_move_constructible<NotMovableVector>::value,
400  "!pybind11::detail::is_move_constructible<NotMovableVector>::value");
401 static_assert(pybind11::detail::is_copy_constructible<NotMovableVector>::value,
402  "pybind11::detail::is_copy_constructible<NotMovableVector>::value");
403 static_assert(std::is_move_assignable<NotMovableVector>::value,
404  "std::is_move_assignable<NotMovableVector>::value");
405 static_assert(std::is_copy_assignable<NotMovableVector>::value,
406  "std::is_copy_assignable<NotMovableVector>::value");
407 // pybind11 does not have this
408 // static_assert(!pybind11::detail::is_move_assignable<NotMovableVector>::value,
409 // "!pybind11::detail::is_move_assignable<NotMovableVector>::value");
410 static_assert(pybind11::detail::is_copy_assignable<NotMovableVector>::value,
411  "pybind11::detail::is_copy_assignable<NotMovableVector>::value");
412 
413 struct NotCopyableVector : std::vector<NotCopyable> {};
414 static_assert(std::is_move_constructible<NotCopyableVector>::value,
415  "std::is_move_constructible<NotCopyableVector>::value");
416 static_assert(std::is_copy_constructible<NotCopyableVector>::value,
417  "std::is_copy_constructible<NotCopyableVector>::value");
418 static_assert(pybind11::detail::is_move_constructible<NotCopyableVector>::value,
419  "pybind11::detail::is_move_constructible<NotCopyableVector>::value");
420 static_assert(!pybind11::detail::is_copy_constructible<NotCopyableVector>::value,
421  "!pybind11::detail::is_copy_constructible<NotCopyableVector>::value");
422 static_assert(std::is_move_assignable<NotCopyableVector>::value,
423  "std::is_move_assignable<NotCopyableVector>::value");
424 static_assert(std::is_copy_assignable<NotCopyableVector>::value,
425  "std::is_copy_assignable<NotCopyableVector>::value");
426 // pybind11 does not have this
427 // static_assert(!pybind11::detail::is_move_assignable<NotCopyableVector>::value,
428 // "!pybind11::detail::is_move_assignable<NotCopyableVector>::value");
429 static_assert(!pybind11::detail::is_copy_assignable<NotCopyableVector>::value,
430  "!pybind11::detail::is_copy_assignable<NotCopyableVector>::value");
431 
432 struct NotCopyableNotMovableVector : std::vector<NotCopyableNotMovable> {};
433 static_assert(std::is_move_constructible<NotCopyableNotMovableVector>::value,
434  "std::is_move_constructible<NotCopyableNotMovableVector>::value");
435 static_assert(std::is_copy_constructible<NotCopyableNotMovableVector>::value,
436  "std::is_copy_constructible<NotCopyableNotMovableVector>::value");
437 static_assert(!pybind11::detail::is_move_constructible<NotCopyableNotMovableVector>::value,
438  "!pybind11::detail::is_move_constructible<NotCopyableNotMovableVector>::value");
439 static_assert(!pybind11::detail::is_copy_constructible<NotCopyableNotMovableVector>::value,
440  "!pybind11::detail::is_copy_constructible<NotCopyableNotMovableVector>::value");
441 static_assert(std::is_move_assignable<NotCopyableNotMovableVector>::value,
442  "std::is_move_assignable<NotCopyableNotMovableVector>::value");
443 static_assert(std::is_copy_assignable<NotCopyableNotMovableVector>::value,
444  "std::is_copy_assignable<NotCopyableNotMovableVector>::value");
445 // pybind11 does not have this
446 // static_assert(!pybind11::detail::is_move_assignable<NotCopyableNotMovableVector>::value,
447 // "!pybind11::detail::is_move_assignable<NotCopyableNotMovableVector>::value");
448 static_assert(!pybind11::detail::is_copy_assignable<NotCopyableNotMovableVector>::value,
449  "!pybind11::detail::is_copy_assignable<NotCopyableNotMovableVector>::value");
450 
451 struct NotMovableMap : std::map<int, NotMovable> {};
452 static_assert(std::is_move_constructible<NotMovableMap>::value,
453  "std::is_move_constructible<NotMovableMap>::value");
454 static_assert(std::is_copy_constructible<NotMovableMap>::value,
455  "std::is_copy_constructible<NotMovableMap>::value");
456 static_assert(!pybind11::detail::is_move_constructible<NotMovableMap>::value,
457  "!pybind11::detail::is_move_constructible<NotMovableMap>::value");
458 static_assert(pybind11::detail::is_copy_constructible<NotMovableMap>::value,
459  "pybind11::detail::is_copy_constructible<NotMovableMap>::value");
460 static_assert(std::is_move_assignable<NotMovableMap>::value,
461  "std::is_move_assignable<NotMovableMap>::value");
462 static_assert(std::is_copy_assignable<NotMovableMap>::value,
463  "std::is_copy_assignable<NotMovableMap>::value");
464 // pybind11 does not have this
465 // static_assert(!pybind11::detail::is_move_assignable<NotMovableMap>::value,
466 // "!pybind11::detail::is_move_assignable<NotMovableMap>::value");
467 static_assert(pybind11::detail::is_copy_assignable<NotMovableMap>::value,
468  "pybind11::detail::is_copy_assignable<NotMovableMap>::value");
469 
470 struct NotCopyableMap : std::map<int, NotCopyable> {};
471 static_assert(std::is_move_constructible<NotCopyableMap>::value,
472  "std::is_move_constructible<NotCopyableMap>::value");
473 static_assert(std::is_copy_constructible<NotCopyableMap>::value,
474  "std::is_copy_constructible<NotCopyableMap>::value");
475 static_assert(pybind11::detail::is_move_constructible<NotCopyableMap>::value,
476  "pybind11::detail::is_move_constructible<NotCopyableMap>::value");
477 static_assert(!pybind11::detail::is_copy_constructible<NotCopyableMap>::value,
478  "!pybind11::detail::is_copy_constructible<NotCopyableMap>::value");
479 static_assert(std::is_move_assignable<NotCopyableMap>::value,
480  "std::is_move_assignable<NotCopyableMap>::value");
481 static_assert(std::is_copy_assignable<NotCopyableMap>::value,
482  "std::is_copy_assignable<NotCopyableMap>::value");
483 // pybind11 does not have this
484 // static_assert(!pybind11::detail::is_move_assignable<NotCopyableMap>::value,
485 // "!pybind11::detail::is_move_assignable<NotCopyableMap>::value");
486 static_assert(!pybind11::detail::is_copy_assignable<NotCopyableMap>::value,
487  "!pybind11::detail::is_copy_assignable<NotCopyableMap>::value");
488 
489 struct NotCopyableNotMovableMap : std::map<int, NotCopyableNotMovable> {};
490 static_assert(std::is_move_constructible<NotCopyableNotMovableMap>::value,
491  "std::is_move_constructible<NotCopyableNotMovableMap>::value");
492 static_assert(std::is_copy_constructible<NotCopyableNotMovableMap>::value,
493  "std::is_copy_constructible<NotCopyableNotMovableMap>::value");
494 static_assert(!pybind11::detail::is_move_constructible<NotCopyableNotMovableMap>::value,
495  "!pybind11::detail::is_move_constructible<NotCopyableNotMovableMap>::value");
496 static_assert(!pybind11::detail::is_copy_constructible<NotCopyableNotMovableMap>::value,
497  "!pybind11::detail::is_copy_constructible<NotCopyableNotMovableMap>::value");
498 static_assert(std::is_move_assignable<NotCopyableNotMovableMap>::value,
499  "std::is_move_assignable<NotCopyableNotMovableMap>::value");
500 static_assert(std::is_copy_assignable<NotCopyableNotMovableMap>::value,
501  "std::is_copy_assignable<NotCopyableNotMovableMap>::value");
502 // pybind11 does not have this
503 // static_assert(!pybind11::detail::is_move_assignable<NotCopyableNotMovableMap>::value,
504 // "!pybind11::detail::is_move_assignable<NotCopyableNotMovableMap>::value");
505 static_assert(!pybind11::detail::is_copy_assignable<NotCopyableNotMovableMap>::value,
506  "!pybind11::detail::is_copy_assignable<NotCopyableNotMovableMap>::value");
507 
508 struct RecursiveVector : std::vector<RecursiveVector> {};
509 static_assert(std::is_move_constructible<RecursiveVector>::value,
510  "std::is_move_constructible<RecursiveVector>::value");
511 static_assert(std::is_copy_constructible<RecursiveVector>::value,
512  "std::is_copy_constructible<RecursiveVector>::value");
513 static_assert(pybind11::detail::is_move_constructible<RecursiveVector>::value,
514  "pybind11::detail::is_move_constructible<RecursiveVector>::value");
515 static_assert(pybind11::detail::is_copy_constructible<RecursiveVector>::value,
516  "pybind11::detail::is_copy_constructible<RecursiveVector>::value");
517 static_assert(std::is_move_assignable<RecursiveVector>::value,
518  "std::is_move_assignable<RecursiveVector>::value");
519 static_assert(std::is_copy_assignable<RecursiveVector>::value,
520  "std::is_copy_assignable<RecursiveVector>::value");
521 // pybind11 does not have this
522 // static_assert(!pybind11::detail::is_move_assignable<RecursiveVector>::value,
523 // "!pybind11::detail::is_move_assignable<RecursiveVector>::value");
524 static_assert(pybind11::detail::is_copy_assignable<RecursiveVector>::value,
525  "pybind11::detail::is_copy_assignable<RecursiveVector>::value");
526 
527 struct RecursiveMap : std::map<int, RecursiveMap> {};
528 static_assert(std::is_move_constructible<RecursiveMap>::value,
529  "std::is_move_constructible<RecursiveMap>::value");
530 static_assert(std::is_copy_constructible<RecursiveMap>::value,
531  "std::is_copy_constructible<RecursiveMap>::value");
532 static_assert(pybind11::detail::is_move_constructible<RecursiveMap>::value,
533  "pybind11::detail::is_move_constructible<RecursiveMap>::value");
534 static_assert(pybind11::detail::is_copy_constructible<RecursiveMap>::value,
535  "pybind11::detail::is_copy_constructible<RecursiveMap>::value");
536 static_assert(std::is_move_assignable<RecursiveMap>::value,
537  "std::is_move_assignable<RecursiveMap>::value");
538 static_assert(std::is_copy_assignable<RecursiveMap>::value,
539  "std::is_copy_assignable<RecursiveMap>::value");
540 // pybind11 does not have this
541 // static_assert(!pybind11::detail::is_move_assignable<RecursiveMap>::value,
542 // "!pybind11::detail::is_move_assignable<RecursiveMap>::value");
543 static_assert(pybind11::detail::is_copy_assignable<RecursiveMap>::value,
544  "pybind11::detail::is_copy_assignable<RecursiveMap>::value");
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