test_copy_move.py
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1 import pytest
2 
3 from pybind11_tests import copy_move_policies as m
4 
5 
7  with pytest.raises(RuntimeError) as excinfo:
8  m.lacking_copy_ctor.get_one()
9  assert "is non-copyable!" in str(excinfo.value)
10 
11 
13  with pytest.raises(RuntimeError) as excinfo:
14  m.lacking_move_ctor.get_one()
15  assert "is neither movable nor copyable!" in str(excinfo.value)
16 
17 
19  """Cast some values in C++ via custom type casters and count the number of moves/copies."""
20 
21  cstats = m.move_and_copy_cstats()
22  c_m, c_mc, c_c = (
23  cstats["MoveOnlyInt"],
24  cstats["MoveOrCopyInt"],
25  cstats["CopyOnlyInt"],
26  )
27 
28  # The type move constructions/assignments below each get incremented: the move assignment comes
29  # from the type_caster load; the move construction happens when extracting that via a cast or
30  # loading into an argument.
31  assert m.move_and_copy_casts(3) == 18
32  assert c_m.copy_assignments + c_m.copy_constructions == 0
33  assert c_m.move_assignments == 2
34  assert c_m.move_constructions >= 2
35  assert c_mc.alive() == 0
36  assert c_mc.copy_assignments + c_mc.copy_constructions == 0
37  assert c_mc.move_assignments == 2
38  assert c_mc.move_constructions >= 2
39  assert c_c.alive() == 0
40  assert c_c.copy_assignments == 2
41  assert c_c.copy_constructions >= 2
42  assert c_m.alive() + c_mc.alive() + c_c.alive() == 0
43 
44 
46  """Call some functions that load arguments via custom type casters and count the number of
47  moves/copies."""
48 
49  cstats = m.move_and_copy_cstats()
50  c_m, c_mc, c_c = (
51  cstats["MoveOnlyInt"],
52  cstats["MoveOrCopyInt"],
53  cstats["CopyOnlyInt"],
54  )
55 
56  assert m.move_only(10) == 10 # 1 move, c_m
57  assert m.move_or_copy(11) == 11 # 1 move, c_mc
58  assert m.copy_only(12) == 12 # 1 copy, c_c
59  assert m.move_pair((13, 14)) == 27 # 1 c_m move, 1 c_mc move
60  assert m.move_tuple((15, 16, 17)) == 48 # 2 c_m moves, 1 c_mc move
61  assert m.copy_tuple((18, 19)) == 37 # 2 c_c copies
62  # Direct constructions: 2 c_m moves, 2 c_mc moves, 1 c_c copy
63  # Extra moves/copies when moving pairs/tuples: 3 c_m, 3 c_mc, 2 c_c
64  assert m.move_copy_nested((1, ((2, 3, (4,)), 5))) == 15
65 
66  assert c_m.copy_assignments + c_m.copy_constructions == 0
67  assert c_m.move_assignments == 6
68  assert c_m.move_constructions == 9
69  assert c_mc.copy_assignments + c_mc.copy_constructions == 0
70  assert c_mc.move_assignments == 5
71  assert c_mc.move_constructions == 8
72  assert c_c.copy_assignments == 4
73  assert c_c.copy_constructions == 6
74  assert c_m.alive() + c_mc.alive() + c_c.alive() == 0
75 
76 
77 @pytest.mark.skipif(not m.has_optional, reason="no <optional>")
79  """Tests move/copy loads of std::optional arguments"""
80 
81  cstats = m.move_and_copy_cstats()
82  c_m, c_mc, c_c = (
83  cstats["MoveOnlyInt"],
84  cstats["MoveOrCopyInt"],
85  cstats["CopyOnlyInt"],
86  )
87 
88  # The extra move/copy constructions below come from the std::optional move (which has to move
89  # its arguments):
90  assert m.move_optional(10) == 10 # c_m: 1 move assign, 2 move construct
91  assert m.move_or_copy_optional(11) == 11 # c_mc: 1 move assign, 2 move construct
92  assert m.copy_optional(12) == 12 # c_c: 1 copy assign, 2 copy construct
93  # 1 move assign + move construct moves each of c_m, c_mc, 1 c_c copy
94  # +1 move/copy construct each from moving the tuple
95  # +1 move/copy construct each from moving the optional (which moves the tuple again)
96  assert m.move_optional_tuple((3, 4, 5)) == 12
97 
98  assert c_m.copy_assignments + c_m.copy_constructions == 0
99  assert c_m.move_assignments == 2
100  assert c_m.move_constructions == 5
101  assert c_mc.copy_assignments + c_mc.copy_constructions == 0
102  assert c_mc.move_assignments == 2
103  assert c_mc.move_constructions == 5
104  assert c_c.copy_assignments == 2
105  assert c_c.copy_constructions == 5
106  assert c_m.alive() + c_mc.alive() + c_c.alive() == 0
107 
108 
110  """An object with a private `operator new` cannot be returned by value"""
111 
112  with pytest.raises(RuntimeError) as excinfo:
113  m.private_op_new_value()
114  assert "is neither movable nor copyable" in str(excinfo.value)
115 
116  assert m.private_op_new_reference().value == 1
117 
118 
120  """#389: rvp::move should fall-through to copy on non-movable objects"""
121 
122  m1 = m.get_moveissue1(1)
123  assert m1.value == 1
124  m2 = m.get_moveissue2(2)
125  assert m2.value == 2
126 
127 
129  """Make sure that cast from pytype rvalue to other pytype works"""
130 
131  value = m.get_pytype_rvalue_castissue(1.0)
132  assert value == 1
def test_lacking_move_ctor()
def test_pytype_rvalue_cast()
Definition: pytypes.h:1403
def test_private_op_new()
def test_lacking_copy_ctor()
def test_move_and_copy_casts()
def test_move_and_copy_loads()
def test_move_and_copy_load_optional()
def test_move_fallback()


gtsam
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autogenerated on Tue Jul 4 2023 02:37:45