knx/examples/knxPython/pybind11/tests/pybind11_tests.h

#pragma once

#include <pybind11/eval.h>
#include <pybind11/pybind11.h>

#include <memory>

namespace py = pybind11;
using namespace pybind11::literals;

class test_initializer
{
        using Initializer = void (*)(py::module_&);

    public:
        explicit test_initializer(Initializer init);
        test_initializer(const char* submodule_name, Initializer init);
};

#define TEST_SUBMODULE(name, variable)                                                            \
    void test_submodule_##name(py::module_ &);                                                    \
    test_initializer name(#name, test_submodule_##name);                                          \
    void test_submodule_##name(py::module_ &(variable))

/// Dummy type which is not exported anywhere -- something to trigger a conversion error
struct UnregisteredType {};

/// A user-defined type which is exported and can be used by any test
class UserType
{
    public:
        UserType() = default;
        explicit UserType(int i) : i(i) {}

        int value() const
        {
            return i;
        }
        void set(int set)
        {
            i = set;
        }

    private:
        int i = -1;
};

/// Like UserType, but increments `value` on copy for quick reference vs. copy tests
class IncType : public UserType
{
    public:
        using UserType::UserType;
        IncType() = default;
        IncType(const IncType& other) : IncType(other.value() + 1) {}
        IncType(IncType&&) = delete;
        IncType& operator=(const IncType&) = delete;
        IncType& operator=(IncType&&) = delete;
};

/// A simple union for basic testing
union IntFloat
{
    int i;
    float f;
};

class UnusualOpRef
{
    public:
        using NonTrivialType = std::shared_ptr<int>; // Almost any non-trivial type will do.
        // Overriding operator& should not break pybind11.
        NonTrivialType operator&()
        {
            return non_trivial_member;
        }
        NonTrivialType operator&() const
        {
            return non_trivial_member;
        }

    private:
        NonTrivialType non_trivial_member;
};

/// Custom cast-only type that casts to a string "rvalue" or "lvalue" depending on the cast
/// context. Used to test recursive casters (e.g. std::tuple, stl containers).
struct RValueCaster {};
PYBIND11_NAMESPACE_BEGIN(pybind11)
PYBIND11_NAMESPACE_BEGIN(detail)
template <>
class type_caster<RValueCaster>
{
    public:
        PYBIND11_TYPE_CASTER(RValueCaster, const_name("RValueCaster"));
        static handle cast(RValueCaster&&, return_value_policy, handle)
        {
            return py::str("rvalue").release();
        }
        static handle cast(const RValueCaster&, return_value_policy, handle)
        {
            return py::str("lvalue").release();
        }
};
PYBIND11_NAMESPACE_END(detail)
PYBIND11_NAMESPACE_END(pybind11)

template <typename F>
void ignoreOldStyleInitWarnings(F&& body)
{
    py::exec(R"(
    message = "pybind11-bound class '.+' is using an old-style placement-new '(?:__init__|__setstate__)' which has been deprecated"

    import warnings
    with warnings.catch_warnings():
        warnings.filterwarnings("ignore", message=message, category=FutureWarning)
        body()
    )",
             py::dict(py::arg("body") = py::cpp_function(body)));
}