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67a0cc4eed
PR #936 broke the ability to return a pointer to a stl container (and, likewise, to a tuple) because the added deduced type matched a non-const pointer argument: the pointer-accepting `cast` in PYBIND11_TYPE_CASTER had a `const type *`, which is a worse match for a non-const pointer than the universal reference template #936 added. This changes the provided TYPE_CASTER cast(ptr) to take the pointer by template arg (so that it will accept either const or non-const pointer). It has two other effects: it slightly reduces .so size (because many type casters never actually need the pointer cast at all), and it allows type casters to provide their untemplated pointer `cast()` that will take precedence over the templated version provided in the macro.
179 lines
5.9 KiB
Python
179 lines
5.9 KiB
Python
import pytest
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from pybind11_tests import stl as m
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from pybind11_tests import UserType
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def test_vector(doc):
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"""std::vector <-> list"""
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l = m.cast_vector()
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assert l == [1]
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l.append(2)
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assert m.load_vector(l)
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assert m.load_vector(tuple(l))
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assert doc(m.cast_vector) == "cast_vector() -> List[int]"
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assert doc(m.load_vector) == "load_vector(arg0: List[int]) -> bool"
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# Test regression caused by 936: pointers to stl containers weren't castable
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assert m.cast_ptr_vector() == ["lvalue", "lvalue"]
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def test_array(doc):
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"""std::array <-> list"""
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l = m.cast_array()
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assert l == [1, 2]
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assert m.load_array(l)
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assert doc(m.cast_array) == "cast_array() -> List[int[2]]"
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assert doc(m.load_array) == "load_array(arg0: List[int[2]]) -> bool"
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def test_valarray(doc):
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"""std::valarray <-> list"""
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l = m.cast_valarray()
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assert l == [1, 4, 9]
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assert m.load_valarray(l)
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assert doc(m.cast_valarray) == "cast_valarray() -> List[int]"
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assert doc(m.load_valarray) == "load_valarray(arg0: List[int]) -> bool"
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def test_map(doc):
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"""std::map <-> dict"""
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d = m.cast_map()
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assert d == {"key": "value"}
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d["key2"] = "value2"
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assert m.load_map(d)
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assert doc(m.cast_map) == "cast_map() -> Dict[str, str]"
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assert doc(m.load_map) == "load_map(arg0: Dict[str, str]) -> bool"
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def test_set(doc):
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"""std::set <-> set"""
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s = m.cast_set()
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assert s == {"key1", "key2"}
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s.add("key3")
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assert m.load_set(s)
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assert doc(m.cast_set) == "cast_set() -> Set[str]"
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assert doc(m.load_set) == "load_set(arg0: Set[str]) -> bool"
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def test_recursive_casting():
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"""Tests that stl casters preserve lvalue/rvalue context for container values"""
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assert m.cast_rv_vector() == ["rvalue", "rvalue"]
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assert m.cast_lv_vector() == ["lvalue", "lvalue"]
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assert m.cast_rv_array() == ["rvalue", "rvalue", "rvalue"]
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assert m.cast_lv_array() == ["lvalue", "lvalue"]
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assert m.cast_rv_map() == {"a": "rvalue"}
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assert m.cast_lv_map() == {"a": "lvalue", "b": "lvalue"}
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assert m.cast_rv_nested() == [[[{"b": "rvalue", "c": "rvalue"}], [{"a": "rvalue"}]]]
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assert m.cast_lv_nested() == {
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"a": [[["lvalue", "lvalue"]], [["lvalue", "lvalue"]]],
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"b": [[["lvalue", "lvalue"], ["lvalue", "lvalue"]]]
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}
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# Issue #853 test case:
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z = m.cast_unique_ptr_vector()
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assert z[0].value == 7 and z[1].value == 42
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def test_move_out_container():
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"""Properties use the `reference_internal` policy by default. If the underlying function
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returns an rvalue, the policy is automatically changed to `move` to avoid referencing
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a temporary. In case the return value is a container of user-defined types, the policy
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also needs to be applied to the elements, not just the container."""
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c = m.MoveOutContainer()
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moved_out_list = c.move_list
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assert [x.value for x in moved_out_list] == [0, 1, 2]
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@pytest.mark.skipif(not hasattr(m, "has_optional"), reason='no <optional>')
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def test_optional():
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assert m.double_or_zero(None) == 0
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assert m.double_or_zero(42) == 84
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pytest.raises(TypeError, m.double_or_zero, 'foo')
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assert m.half_or_none(0) is None
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assert m.half_or_none(42) == 21
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pytest.raises(TypeError, m.half_or_none, 'foo')
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assert m.test_nullopt() == 42
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assert m.test_nullopt(None) == 42
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assert m.test_nullopt(42) == 42
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assert m.test_nullopt(43) == 43
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assert m.test_no_assign() == 42
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assert m.test_no_assign(None) == 42
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assert m.test_no_assign(m.NoAssign(43)) == 43
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pytest.raises(TypeError, m.test_no_assign, 43)
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assert m.nodefer_none_optional(None)
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@pytest.mark.skipif(not hasattr(m, "has_exp_optional"), reason='no <experimental/optional>')
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def test_exp_optional():
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assert m.double_or_zero_exp(None) == 0
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assert m.double_or_zero_exp(42) == 84
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pytest.raises(TypeError, m.double_or_zero_exp, 'foo')
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assert m.half_or_none_exp(0) is None
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assert m.half_or_none_exp(42) == 21
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pytest.raises(TypeError, m.half_or_none_exp, 'foo')
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assert m.test_nullopt_exp() == 42
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assert m.test_nullopt_exp(None) == 42
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assert m.test_nullopt_exp(42) == 42
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assert m.test_nullopt_exp(43) == 43
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assert m.test_no_assign_exp() == 42
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assert m.test_no_assign_exp(None) == 42
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assert m.test_no_assign_exp(m.NoAssign(43)) == 43
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pytest.raises(TypeError, m.test_no_assign_exp, 43)
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@pytest.mark.skipif(not hasattr(m, "load_variant"), reason='no <variant>')
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def test_variant(doc):
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assert m.load_variant(1) == "int"
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assert m.load_variant("1") == "std::string"
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assert m.load_variant(1.0) == "double"
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assert m.load_variant(None) == "std::nullptr_t"
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assert m.load_variant_2pass(1) == "int"
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assert m.load_variant_2pass(1.0) == "double"
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assert m.cast_variant() == (5, "Hello")
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assert doc(m.load_variant) == "load_variant(arg0: Union[int, str, float, None]) -> str"
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def test_vec_of_reference_wrapper():
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"""#171: Can't return reference wrappers (or STL structures containing them)"""
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assert str(m.return_vec_of_reference_wrapper(UserType(4))) == \
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"[UserType(1), UserType(2), UserType(3), UserType(4)]"
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def test_stl_pass_by_pointer(msg):
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"""Passing nullptr or None to an STL container pointer is not expected to work"""
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with pytest.raises(TypeError) as excinfo:
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m.stl_pass_by_pointer() # default value is `nullptr`
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assert msg(excinfo.value) == """
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stl_pass_by_pointer(): incompatible function arguments. The following argument types are supported:
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1. (v: List[int]=None) -> List[int]
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Invoked with:
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""" # noqa: E501 line too long
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with pytest.raises(TypeError) as excinfo:
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m.stl_pass_by_pointer(None)
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assert msg(excinfo.value) == """
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stl_pass_by_pointer(): incompatible function arguments. The following argument types are supported:
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1. (v: List[int]=None) -> List[int]
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Invoked with: None
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""" # noqa: E501 line too long
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assert m.stl_pass_by_pointer([1, 2, 3]) == [1, 2, 3]
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