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5e14aa6aa7
The main point of `py::module_local` is to make the C++ -> Python cast unique so that returning/casting a C++ instance is well-defined. Unfortunately it also makes loading unique, but this isn't particularly desirable: when an instance contains `Type` instance there's no reason it shouldn't be possible to pass that instance to a bound function taking a `Type` parameter, even if that function is in another module. This commit solves the issue by allowing foreign module (and global) type loaders have a chance to load the value if the local module loader fails. The implementation here does this by storing a module-local loading function in a capsule in the python type, which we can then call if the local (and possibly global, if the local type is masking a global type) version doesn't work.
61 lines
1.9 KiB
C++
61 lines
1.9 KiB
C++
#pragma once
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#include "pybind11_tests.h"
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/// Simple class used to test py::local:
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template <int> class LocalBase {
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public:
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LocalBase(int i) : i(i) { }
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int i = -1;
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};
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/// Registered with py::local in both main and secondary modules:
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using LocalType = LocalBase<0>;
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/// Registered without py::local in both modules:
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using NonLocalType = LocalBase<1>;
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/// A second non-local type (for stl_bind tests):
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using NonLocal2 = LocalBase<2>;
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/// Tests within-module, different-compilation-unit local definition conflict:
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using LocalExternal = LocalBase<3>;
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/// Mixed: registered local first, then global
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using MixedLocalGlobal = LocalBase<4>;
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/// Mixed: global first, then local
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using MixedGlobalLocal = LocalBase<5>;
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using LocalVec = std::vector<LocalType>;
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using LocalVec2 = std::vector<NonLocal2>;
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using LocalMap = std::unordered_map<std::string, LocalType>;
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using NonLocalVec = std::vector<NonLocalType>;
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using NonLocalVec2 = std::vector<NonLocal2>;
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using NonLocalMap = std::unordered_map<std::string, NonLocalType>;
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using NonLocalMap2 = std::unordered_map<std::string, uint8_t>;
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PYBIND11_MAKE_OPAQUE(LocalVec);
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PYBIND11_MAKE_OPAQUE(LocalVec2);
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PYBIND11_MAKE_OPAQUE(LocalMap);
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PYBIND11_MAKE_OPAQUE(NonLocalVec);
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//PYBIND11_MAKE_OPAQUE(NonLocalVec2); // same type as LocalVec2
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PYBIND11_MAKE_OPAQUE(NonLocalMap);
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PYBIND11_MAKE_OPAQUE(NonLocalMap2);
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// Simple bindings (used with the above):
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template <typename T, int Adjust, typename... Args>
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py::class_<T> bind_local(Args && ...args) {
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return py::class_<T>(std::forward<Args>(args)...)
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.def(py::init<int>())
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.def("get", [](T &i) { return i.i + Adjust; });
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};
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// Simulate a foreign library base class (to match the example in the docs):
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namespace pets {
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class Pet {
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public:
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Pet(std::string name) : name_(name) {}
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std::string name_;
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const std::string &name() { return name_; }
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};
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}
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struct MixGL { int i; MixGL(int i) : i{i} {} };
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struct MixGL2 { int i; MixGL2(int i) : i{i} {} };
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