test_copy_move.py revision 12391
112391Sjason@lowepower.comimport pytest 212391Sjason@lowepower.comfrom pybind11_tests import copy_move_policies as m 312391Sjason@lowepower.com 412391Sjason@lowepower.com 512391Sjason@lowepower.comdef test_lacking_copy_ctor(): 612391Sjason@lowepower.com with pytest.raises(RuntimeError) as excinfo: 712391Sjason@lowepower.com m.lacking_copy_ctor.get_one() 812391Sjason@lowepower.com assert "the object is non-copyable!" in str(excinfo.value) 912391Sjason@lowepower.com 1012391Sjason@lowepower.com 1112391Sjason@lowepower.comdef test_lacking_move_ctor(): 1212391Sjason@lowepower.com with pytest.raises(RuntimeError) as excinfo: 1312391Sjason@lowepower.com m.lacking_move_ctor.get_one() 1412391Sjason@lowepower.com assert "the object is neither movable nor copyable!" in str(excinfo.value) 1512391Sjason@lowepower.com 1612391Sjason@lowepower.com 1712391Sjason@lowepower.comdef test_move_and_copy_casts(): 1812391Sjason@lowepower.com """Cast some values in C++ via custom type casters and count the number of moves/copies.""" 1912391Sjason@lowepower.com 2012391Sjason@lowepower.com cstats = m.move_and_copy_cstats() 2112391Sjason@lowepower.com c_m, c_mc, c_c = cstats["MoveOnlyInt"], cstats["MoveOrCopyInt"], cstats["CopyOnlyInt"] 2212391Sjason@lowepower.com 2312391Sjason@lowepower.com # The type move constructions/assignments below each get incremented: the move assignment comes 2412391Sjason@lowepower.com # from the type_caster load; the move construction happens when extracting that via a cast or 2512391Sjason@lowepower.com # loading into an argument. 2612391Sjason@lowepower.com assert m.move_and_copy_casts(3) == 18 2712391Sjason@lowepower.com assert c_m.copy_assignments + c_m.copy_constructions == 0 2812391Sjason@lowepower.com assert c_m.move_assignments == 2 2912391Sjason@lowepower.com assert c_m.move_constructions >= 2 3012391Sjason@lowepower.com assert c_mc.alive() == 0 3112391Sjason@lowepower.com assert c_mc.copy_assignments + c_mc.copy_constructions == 0 3212391Sjason@lowepower.com assert c_mc.move_assignments == 2 3312391Sjason@lowepower.com assert c_mc.move_constructions >= 2 3412391Sjason@lowepower.com assert c_c.alive() == 0 3512391Sjason@lowepower.com assert c_c.copy_assignments == 2 3612391Sjason@lowepower.com assert c_c.copy_constructions >= 2 3712391Sjason@lowepower.com assert c_m.alive() + c_mc.alive() + c_c.alive() == 0 3812391Sjason@lowepower.com 3912391Sjason@lowepower.com 4012391Sjason@lowepower.comdef test_move_and_copy_loads(): 4112391Sjason@lowepower.com """Call some functions that load arguments via custom type casters and count the number of 4212391Sjason@lowepower.com moves/copies.""" 4312391Sjason@lowepower.com 4412391Sjason@lowepower.com cstats = m.move_and_copy_cstats() 4512391Sjason@lowepower.com c_m, c_mc, c_c = cstats["MoveOnlyInt"], cstats["MoveOrCopyInt"], cstats["CopyOnlyInt"] 4612391Sjason@lowepower.com 4712391Sjason@lowepower.com assert m.move_only(10) == 10 # 1 move, c_m 4812391Sjason@lowepower.com assert m.move_or_copy(11) == 11 # 1 move, c_mc 4912391Sjason@lowepower.com assert m.copy_only(12) == 12 # 1 copy, c_c 5012391Sjason@lowepower.com assert m.move_pair((13, 14)) == 27 # 1 c_m move, 1 c_mc move 5112391Sjason@lowepower.com assert m.move_tuple((15, 16, 17)) == 48 # 2 c_m moves, 1 c_mc move 5212391Sjason@lowepower.com assert m.copy_tuple((18, 19)) == 37 # 2 c_c copies 5312391Sjason@lowepower.com # Direct constructions: 2 c_m moves, 2 c_mc moves, 1 c_c copy 5412391Sjason@lowepower.com # Extra moves/copies when moving pairs/tuples: 3 c_m, 3 c_mc, 2 c_c 5512391Sjason@lowepower.com assert m.move_copy_nested((1, ((2, 3, (4,)), 5))) == 15 5612391Sjason@lowepower.com 5712391Sjason@lowepower.com assert c_m.copy_assignments + c_m.copy_constructions == 0 5812391Sjason@lowepower.com assert c_m.move_assignments == 6 5912391Sjason@lowepower.com assert c_m.move_constructions == 9 6012391Sjason@lowepower.com assert c_mc.copy_assignments + c_mc.copy_constructions == 0 6112391Sjason@lowepower.com assert c_mc.move_assignments == 5 6212391Sjason@lowepower.com assert c_mc.move_constructions == 8 6312391Sjason@lowepower.com assert c_c.copy_assignments == 4 6412391Sjason@lowepower.com assert c_c.copy_constructions == 6 6512391Sjason@lowepower.com assert c_m.alive() + c_mc.alive() + c_c.alive() == 0 6612391Sjason@lowepower.com 6712391Sjason@lowepower.com 6812391Sjason@lowepower.com@pytest.mark.skipif(not m.has_optional, reason='no <optional>') 6912391Sjason@lowepower.comdef test_move_and_copy_load_optional(): 7012391Sjason@lowepower.com """Tests move/copy loads of std::optional arguments""" 7112391Sjason@lowepower.com 7212391Sjason@lowepower.com cstats = m.move_and_copy_cstats() 7312391Sjason@lowepower.com c_m, c_mc, c_c = cstats["MoveOnlyInt"], cstats["MoveOrCopyInt"], cstats["CopyOnlyInt"] 7412391Sjason@lowepower.com 7512391Sjason@lowepower.com # The extra move/copy constructions below come from the std::optional move (which has to move 7612391Sjason@lowepower.com # its arguments): 7712391Sjason@lowepower.com assert m.move_optional(10) == 10 # c_m: 1 move assign, 2 move construct 7812391Sjason@lowepower.com assert m.move_or_copy_optional(11) == 11 # c_mc: 1 move assign, 2 move construct 7912391Sjason@lowepower.com assert m.copy_optional(12) == 12 # c_c: 1 copy assign, 2 copy construct 8012391Sjason@lowepower.com # 1 move assign + move construct moves each of c_m, c_mc, 1 c_c copy 8112391Sjason@lowepower.com # +1 move/copy construct each from moving the tuple 8212391Sjason@lowepower.com # +1 move/copy construct each from moving the optional (which moves the tuple again) 8312391Sjason@lowepower.com assert m.move_optional_tuple((3, 4, 5)) == 12 8412391Sjason@lowepower.com 8512391Sjason@lowepower.com assert c_m.copy_assignments + c_m.copy_constructions == 0 8612391Sjason@lowepower.com assert c_m.move_assignments == 2 8712391Sjason@lowepower.com assert c_m.move_constructions == 5 8812391Sjason@lowepower.com assert c_mc.copy_assignments + c_mc.copy_constructions == 0 8912391Sjason@lowepower.com assert c_mc.move_assignments == 2 9012391Sjason@lowepower.com assert c_mc.move_constructions == 5 9112391Sjason@lowepower.com assert c_c.copy_assignments == 2 9212391Sjason@lowepower.com assert c_c.copy_constructions == 5 9312391Sjason@lowepower.com assert c_m.alive() + c_mc.alive() + c_c.alive() == 0 9412391Sjason@lowepower.com 9512391Sjason@lowepower.com 9612391Sjason@lowepower.comdef test_private_op_new(): 9712391Sjason@lowepower.com """An object with a private `operator new` cannot be returned by value""" 9812391Sjason@lowepower.com 9912391Sjason@lowepower.com with pytest.raises(RuntimeError) as excinfo: 10012391Sjason@lowepower.com m.private_op_new_value() 10112391Sjason@lowepower.com assert "the object is neither movable nor copyable" in str(excinfo.value) 10212391Sjason@lowepower.com 10312391Sjason@lowepower.com assert m.private_op_new_reference().value == 1 10412391Sjason@lowepower.com 10512391Sjason@lowepower.com 10612391Sjason@lowepower.comdef test_move_fallback(): 10712391Sjason@lowepower.com """#389: rvp::move should fall-through to copy on non-movable objects""" 10812391Sjason@lowepower.com 10912391Sjason@lowepower.com m2 = m.get_moveissue2(2) 11012391Sjason@lowepower.com assert m2.value == 2 11112391Sjason@lowepower.com m1 = m.get_moveissue1(1) 11212391Sjason@lowepower.com assert m1.value == 1 113