Avoid string copy if possible when passing a Python object to std::ostream (#3042)

733f8de2 · jonathan-conder-sm · GitHub · cad79c11 · 733f8de2
Unverified Commit 733f8de2 authored Jul 01, 2021 by jonathan-conder-sm Committed by GitHub Jun 30, 2021
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include/pybind11/stl.h include/pybind11/stl.h +4 -0

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--- 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;
 }