127 lines
4.5 KiB
Python
127 lines
4.5 KiB
Python
# -*- coding: utf-8 -*-
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import pytest
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from pybind11_tests import copy_move_policies as m
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def test_lacking_copy_ctor():
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with pytest.raises(RuntimeError) as excinfo:
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m.lacking_copy_ctor.get_one()
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assert "is non-copyable!" in str(excinfo.value)
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def test_lacking_move_ctor():
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with pytest.raises(RuntimeError) as excinfo:
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m.lacking_move_ctor.get_one()
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assert "is neither movable nor copyable!" in str(excinfo.value)
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def test_move_and_copy_casts():
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"""Cast some values in C++ via custom type casters and count the number of moves/copies."""
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cstats = m.move_and_copy_cstats()
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c_m, c_mc, c_c = (
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cstats["MoveOnlyInt"],
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cstats["MoveOrCopyInt"],
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cstats["CopyOnlyInt"],
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)
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# The type move constructions/assignments below each get incremented: the move assignment comes
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# from the type_caster load; the move construction happens when extracting that via a cast or
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# loading into an argument.
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assert m.move_and_copy_casts(3) == 18
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assert c_m.copy_assignments + c_m.copy_constructions == 0
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assert c_m.move_assignments == 2
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assert c_m.move_constructions >= 2
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assert c_mc.alive() == 0
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assert c_mc.copy_assignments + c_mc.copy_constructions == 0
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assert c_mc.move_assignments == 2
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assert c_mc.move_constructions >= 2
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assert c_c.alive() == 0
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assert c_c.copy_assignments == 2
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assert c_c.copy_constructions >= 2
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assert c_m.alive() + c_mc.alive() + c_c.alive() == 0
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def test_move_and_copy_loads():
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"""Call some functions that load arguments via custom type casters and count the number of
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moves/copies."""
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cstats = m.move_and_copy_cstats()
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c_m, c_mc, c_c = (
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cstats["MoveOnlyInt"],
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cstats["MoveOrCopyInt"],
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cstats["CopyOnlyInt"],
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)
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assert m.move_only(10) == 10 # 1 move, c_m
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assert m.move_or_copy(11) == 11 # 1 move, c_mc
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assert m.copy_only(12) == 12 # 1 copy, c_c
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assert m.move_pair((13, 14)) == 27 # 1 c_m move, 1 c_mc move
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assert m.move_tuple((15, 16, 17)) == 48 # 2 c_m moves, 1 c_mc move
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assert m.copy_tuple((18, 19)) == 37 # 2 c_c copies
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# Direct constructions: 2 c_m moves, 2 c_mc moves, 1 c_c copy
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# Extra moves/copies when moving pairs/tuples: 3 c_m, 3 c_mc, 2 c_c
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assert m.move_copy_nested((1, ((2, 3, (4,)), 5))) == 15
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assert c_m.copy_assignments + c_m.copy_constructions == 0
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assert c_m.move_assignments == 6
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assert c_m.move_constructions == 9
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assert c_mc.copy_assignments + c_mc.copy_constructions == 0
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assert c_mc.move_assignments == 5
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assert c_mc.move_constructions == 8
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assert c_c.copy_assignments == 4
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assert c_c.copy_constructions == 6
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assert c_m.alive() + c_mc.alive() + c_c.alive() == 0
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@pytest.mark.skipif(not m.has_optional, reason="no <optional>")
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def test_move_and_copy_load_optional():
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"""Tests move/copy loads of std::optional arguments"""
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cstats = m.move_and_copy_cstats()
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c_m, c_mc, c_c = (
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cstats["MoveOnlyInt"],
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cstats["MoveOrCopyInt"],
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cstats["CopyOnlyInt"],
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)
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# The extra move/copy constructions below come from the std::optional move (which has to move
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# its arguments):
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assert m.move_optional(10) == 10 # c_m: 1 move assign, 2 move construct
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assert m.move_or_copy_optional(11) == 11 # c_mc: 1 move assign, 2 move construct
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assert m.copy_optional(12) == 12 # c_c: 1 copy assign, 2 copy construct
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# 1 move assign + move construct moves each of c_m, c_mc, 1 c_c copy
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# +1 move/copy construct each from moving the tuple
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# +1 move/copy construct each from moving the optional (which moves the tuple again)
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assert m.move_optional_tuple((3, 4, 5)) == 12
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assert c_m.copy_assignments + c_m.copy_constructions == 0
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assert c_m.move_assignments == 2
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assert c_m.move_constructions == 5
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assert c_mc.copy_assignments + c_mc.copy_constructions == 0
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assert c_mc.move_assignments == 2
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assert c_mc.move_constructions == 5
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assert c_c.copy_assignments == 2
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assert c_c.copy_constructions == 5
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assert c_m.alive() + c_mc.alive() + c_c.alive() == 0
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def test_private_op_new():
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"""An object with a private `operator new` cannot be returned by value"""
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with pytest.raises(RuntimeError) as excinfo:
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m.private_op_new_value()
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assert "is neither movable nor copyable" in str(excinfo.value)
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assert m.private_op_new_reference().value == 1
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def test_move_fallback():
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"""#389: rvp::move should fall-through to copy on non-movable objects"""
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m1 = m.get_moveissue1(1)
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assert m1.value == 1
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m2 = m.get_moveissue2(2)
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assert m2.value == 2
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