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feat(types) Adds special Case for empty C++ tuple type annotation (#5214)

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* add special case and unit test

* add newline
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Michael Carlstrom 2024-06-30 12:52:37 -04:00 committed by Henry Schreiner
parent 639ca6a71a
commit a4dd41a18e
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2 changed files with 9 additions and 0 deletions
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7
include/pybind11/cast.h
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@ -740,6 +740,13 @@ class type_caster<std::pair<T1, T2>> : public tuple_caster<std::pair, T1, T2> {}
template <typename... Ts>
class type_caster<std::tuple<Ts...>> : public tuple_caster<std::tuple, Ts...> {};
template <>
class type_caster<std::tuple<>> : public tuple_caster<std::tuple> {
public:
// PEP 484 specifies this syntax for an empty tuple
static constexpr auto name = const_name("tuple[()]");
};
/// Helper class which abstracts away certain actions. Users can provide specializations for
/// custom holders, but it's only necessary if the type has a non-standard interface.
template <typename T>

2
tests/test_builtin_casters.py
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@ -368,6 +368,8 @@ def test_tuple(doc):
"""
)
assert doc(m.empty_tuple) == """empty_tuple() -> tuple[()]"""
assert m.rvalue_pair() == ("rvalue", "rvalue")
assert m.lvalue_pair() == ("lvalue", "lvalue")
assert m.rvalue_tuple() == ("rvalue", "rvalue", "rvalue")