Avoid string copy if possible when passing a Python object to std::os…

…tream (#3042)
pybind · Jul 1, 2021 · 733f8de · 733f8de
1 parent cad79c1
commit 733f8de
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/include/pybind11/stl.h b/include/pybind11/stl.h
@@ -380,7 +380,11 @@ struct type_caster<std::variant<Ts...>> : variant_caster<std::variant<Ts...>> {
 PYBIND11_NAMESPACE_END(detail)
 
 inline std::ostream &operator<<(std::ostream &os, const handle &obj) {
+#ifdef PYBIND11_HAS_STRING_VIEW
+    os << str(obj).cast<std::string_view>();
+#else
     os << (std::string) str(obj);
+#endif
     return os;
 }