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enum serialization support (fixes #380)

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Wenzel Jakob 2016-09-05 17:20:50 +09:00
parent 70f5a4dc8b
commit 8ac9715f84
1 changed files with 13 additions and 9 deletions
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22
include/pybind11/pybind11.h
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@ -1017,30 +1017,34 @@ private:
/// Binds C++ enumerations and enumeration classes to Python /// Binds C++ enumerations and enumeration classes to Python
template <typename Type> class enum_ : public class_<Type> { template <typename Type> class enum_ : public class_<Type> {
public: public:
using class_<Type>::def;
using UnderlyingType = typename std::underlying_type<Type>::type; using UnderlyingType = typename std::underlying_type<Type>::type;
template <typename... Extra> template <typename... Extra>
enum_(const handle &scope, const char *name, const Extra&... extra) enum_(const handle &scope, const char *name, const Extra&... extra)
: class_<Type>(scope, name, extra...), m_parent(scope) { : class_<Type>(scope, name, extra...), m_parent(scope) {
auto entries = new std::unordered_map<UnderlyingType, const char *>(); auto entries = new std::unordered_map<UnderlyingType, const char *>();
this->def("__repr__", [name, entries](Type value) -> std::string { def("__repr__", [name, entries](Type value) -> std::string {
auto it = entries->find((UnderlyingType) value); auto it = entries->find((UnderlyingType) value);
return std::string(name) + "." + return std::string(name) + "." +
((it == entries->end()) ? std::string("???") ((it == entries->end()) ? std::string("???")
: std::string(it->second)); : std::string(it->second));
}); });
this->def("__init__", [](Type& value, UnderlyingType i) { value = (Type)i; }); def("__init__", [](Type& value, UnderlyingType i) { value = (Type)i; });
this->def("__init__", [](Type& value, UnderlyingType i) { new (&value) Type((Type) i); }); def("__init__", [](Type& value, UnderlyingType i) { new (&value) Type((Type) i); });
this->def("__int__", [](Type value) { return (UnderlyingType) value; }); def("__int__", [](Type value) { return (UnderlyingType) value; });
this->def("__eq__", [](const Type &value, Type *value2) { return value2 && value == *value2; }); def("__eq__", [](const Type &value, Type *value2) { return value2 && value == *value2; });
this->def("__ne__", [](const Type &value, Type *value2) { return !value2 || value != *value2; }); def("__ne__", [](const Type &value, Type *value2) { return !value2 || value != *value2; });
if (std::is_convertible<Type, UnderlyingType>::value) { if (std::is_convertible<Type, UnderlyingType>::value) {
// Don't provide comparison with the underlying type if the enum isn't convertible, // Don't provide comparison with the underlying type if the enum isn't convertible,
// i.e. if Type is a scoped enum, mirroring the C++ behaviour. (NB: we explicitly // i.e. if Type is a scoped enum, mirroring the C++ behaviour. (NB: we explicitly
// convert Type to UnderlyingType below anyway because this needs to compile). // convert Type to UnderlyingType below anyway because this needs to compile).
this->def("__eq__", [](const Type &value, UnderlyingType value2) { return (UnderlyingType) value == value2; }); def("__eq__", [](const Type &value, UnderlyingType value2) { return (UnderlyingType) value == value2; });
this->def("__ne__", [](const Type &value, UnderlyingType value2) { return (UnderlyingType) value != value2; }); def("__ne__", [](const Type &value, UnderlyingType value2) { return (UnderlyingType) value != value2; });
} }
this->def("__hash__", [](const Type &value) { return (UnderlyingType) value; }); def("__hash__", [](const Type &value) { return (UnderlyingType) value; });
// Pickling and unpickling -- needed for use with the 'multiprocessing' module
def("__getstate__", [](const Type &value) { return pybind11::make_tuple((UnderlyingType) value); });
def("__setstate__", [](Type &p, tuple t) { new (&p) Type((Type) t[0].cast<UnderlyingType>()); });
m_entries = entries; m_entries = entries;
} }