[embind] Add support for argument policies to val methods. #26020
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This change adds support for using argument policies with val::set, val::operator(), val::call, val::new_, and the val constructor. Previously, these methods used default behavior (usually copy) or required manual handling. Now policies like policy::take_ownership or policy::reference can be used directly to control how values are passed between C++ and JS. See test/embind/test_val.cpp for usage examples. Fixes emscripten-core#25412
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Another idea I've been toying with is to rely more on the C++ semantics. i.e. values are moved if possible, otherwise they're copied. Pointers would be how you reference an object. The downside of that approach is it doesn't really signal whether JS should delete the object or it's managed by C++. |
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This change adds support for using argument policies with val::set, val::operator(), val::call, val::new_, and the val constructor.
Previously, these methods used default behavior (usually copy) or required manual handling. Now policies like policy::take_ownership or policy::reference can be used directly to control how values are passed between C++ and JS.
See test/embind/test_val.cpp for usage examples.
Fixes #25412