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Set __hash__ to None for types that defines __eq__, but not __hash__ (#2291)

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fixes #2191
This commit is contained in:
Sergei Izmailov
2020-07-27 02:44:25 +03:00
committed by GitHub
parent aab701399a
commit 7b067cc387
3 changed files with 56 additions and 1 deletions
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9
include/pybind11/pybind11.h
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@@ -1047,6 +1047,13 @@ inline void call_operator_delete(void *p, size_t s, size_t a) {
#endif
}
inline void add_class_method(object& cls, const char *name_, const cpp_function &cf) {
cls.attr(cf.name()) = cf;
if (strcmp(name_, "__eq__") == 0 && !cls.attr("__dict__").contains("__hash__")) {
cls.attr("__hash__") = none();
}
}
PYBIND11_NAMESPACE_END(detail)
/// Given a pointer to a member function, cast it to its `Derived` version.
@@ -1144,7 +1151,7 @@ public:
class_ &def(const char *name_, Func&& f, const Extra&... extra) {
cpp_function cf(method_adaptor<type>(std::forward<Func>(f)), name(name_), is_method(*this),
sibling(getattr(*this, name_, none())), extra...);
attr(cf.name()) = cf;
add_class_method(*this, name_, cf);
return *this;
}