When exposing C++ code with pybind11, I was able to bind the assigment operator overload of MyDouble class as follows:
class MyDouble {
public:
MyDouble(double value) : _value(value) { }
// ...
MyDouble& operator=(double value) { _value = value; return *this; }
operator double() const { return _value; }
protected:
double _value;
};
class MyClass {
public:
MyClass(double value) : member(value) { }
// ...
MyDouble member;
std::string label;
};
// ...
py::class_< MyDouble >(module, "MyDouble")
.def(py::init< double >(), "value"_a)
.def("__float__", &MyDouble::operator double);
py::implicitly_convertible< double, MyDouble >();
py::class_< MyClass >(module, "MyClass")
.def(py::init< double >(), "value"_a)
.def("__setattr__", [](MyClass& c, const char* name, double value) { if (std::string(name) == "member") { c.member = value; } })
.def("__setattr__", [](MyClass& c, const char* name, const MyDouble& other) { if (std::string(name) == "member") { c.member = other; } })
.def("__setattr__", [](MyClass& c, const char* name, const std::string& label) { if (std::string(name) == "label") { c.label = label; } })
.def_readonly("label", &MyClass::label) // <- only getter
.def_readonly("member", &MyClass::member); // <- only getter
However, the main drawback of this approach is that one becomes unable to define any properties or public members, as __setattr__ will shadow any def_readwrite call.
Is there a for __setattr__ to only be called for specific argument types?