Internal change

PiperOrigin-RevId: 368762888

pybind11_abseil/absl_casters.h

@@ -269,6 +269,18 @@ struct type_caster<absl::Span<const T>> {
       : vector_converter_(std::move(other.vector_converter_)),
         value_(get_vector()) {}
 
+  type_caster& operator=(const type_caster<absl::Span<const T>>& other) {
+    vector_converter_ = other.vector_converter_;
+    value_ = get_vector();
+    return *this;
+  }
+
+  type_caster& operator=(type_caster<absl::Span<const T>>&& other) {
+    vector_converter_ = std::move(other.vector_converter_);
+    value_ = get_vector();
+    return *this;
+  }
+
   static constexpr auto name = _("Span[") + make_caster<T>::name + _("]");
 
   // We do not allow moving because 1) spans are super lightweight, so there's

pybind11_abseil/tests/absl_example.cc

@@ -43,6 +43,13 @@ bool CheckSpan(absl::Span<const int> span, const std::vector<int>& values) {
   return true;
 }
 
+bool CheckSpanCasterCopy(const handle& span, const std::vector<int>& values) {
+  pybind11::detail::make_caster<absl::Span<const int>> caster;
+  caster = pybind11::detail::load_type<absl::Span<const int>>(span);
+  return CheckSpan(pybind11::detail::cast_op<absl::Span<const int>>(caster),
+                   values);
+}
+
 absl::CivilSecond MakeCivilSecond(double secs) {
   return absl::ToCivilSecond(absl::FromUnixSeconds(static_cast<int64_t>(secs)),
                              absl::UTCTimeZone());
@@ -246,6 +253,8 @@ PYBIND11_MODULE(absl_example, m) {
 
   // absl::Span bindings.
   m.def("check_span", &CheckSpan, arg("span"), arg("values"));
+  m.def("check_span_caster_copy", &CheckSpanCasterCopy, arg("span"),
+        arg("values"));
   class_<VectorContainer>(m, "VectorContainer")
       .def(init())
       .def("make_span", &VectorContainer::MakeSpan, arg("values"));

pybind11_abseil/tests/absl_test.py

@@ -227,6 +227,7 @@ class AbslSpanTest(parameterized.TestCase):
     # Pass values twice- one will be converted to a span, the other to a vector
     # (which is known to work), and then they will be compared.
     self.assertTrue(absl_example.check_span(values, values))
+    self.assertTrue(absl_example.check_span_caster_copy(values, values))
 
   def test_span_with_pointers(self):
     objs = [absl_example.ObjectForSpan(3), absl_example.ObjectForSpan(5)]