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b57281bb00
This updates the std::tuple, std::pair and `stl.h` type casters to forward their contained value according to whether the container being cast is an lvalue or rvalue reference. This fixes an issue where subcaster casts were always called with a const lvalue which meant nested type casters didn't have the desired `cast()` overload invoked. For example, this caused Eigen values in a tuple to end up with a readonly flag (issue #935) and made it impossible to return a container of move-only types (issue #853). This fixes both issues by adding templated universal reference `cast()` methods to the various container types that forward container elements according to the container reference type.
65 lines
2.1 KiB
C++
65 lines
2.1 KiB
C++
#pragma once
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#include <pybind11/pybind11.h>
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#if defined(_MSC_VER) && _MSC_VER < 1910
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// We get some really long type names here which causes MSVC 2015 to emit warnings
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# pragma warning(disable: 4503) // warning C4503: decorated name length exceeded, name was truncated
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#endif
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namespace py = pybind11;
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using namespace pybind11::literals;
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class test_initializer {
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using Initializer = void (*)(py::module &);
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public:
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test_initializer(Initializer init);
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test_initializer(const char *submodule_name, Initializer init);
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};
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#define TEST_SUBMODULE(name, variable) \
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void test_submodule_##name(py::module &); \
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test_initializer name(#name, test_submodule_##name); \
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void test_submodule_##name(py::module &variable)
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/// Dummy type which is not exported anywhere -- something to trigger a conversion error
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struct UnregisteredType { };
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/// A user-defined type which is exported and can be used by any test
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class UserType {
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public:
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UserType() = default;
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UserType(int i) : i(i) { }
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int value() const { return i; }
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private:
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int i = -1;
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};
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/// Like UserType, but increments `value` on copy for quick reference vs. copy tests
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class IncType : public UserType {
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public:
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using UserType::UserType;
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IncType() = default;
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IncType(const IncType &other) : IncType(other.value() + 1) { }
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IncType(IncType &&) = delete;
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IncType &operator=(const IncType &) = delete;
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IncType &operator=(IncType &&) = delete;
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};
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/// Custom cast-only type that casts to a string "rvalue" or "lvalue" depending on the cast context.
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/// Used to test recursive casters (e.g. std::tuple, stl containers).
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struct RValueCaster {};
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NAMESPACE_BEGIN(pybind11)
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NAMESPACE_BEGIN(detail)
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template<> class type_caster<RValueCaster> {
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public:
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PYBIND11_TYPE_CASTER(RValueCaster, _("RValueCaster"));
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static handle cast(RValueCaster &&, return_value_policy, handle) { return py::str("rvalue").release(); }
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static handle cast(const RValueCaster &, return_value_policy, handle) { return py::str("lvalue").release(); }
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};
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NAMESPACE_END(detail)
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NAMESPACE_END(pybind11)
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