From e496e7eaf12894c1bb7a3b7debdf90c9d55c5937 Mon Sep 17 00:00:00 2001
From: Jonathan Conder <jonathan.conder@soulmachines.com>
Date: Thu, 17 Jun 2021 14:30:35 +1200
Subject: [PATCH] Avoid string copy if possible when passing a Python object to
 std::ostream

---
 include/pybind11/stl.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/pybind11/stl.h b/include/pybind11/stl.h
index 18fbafb1e2..5844d3de7b 100644
--- a/include/pybind11/stl.h
+++ b/include/pybind11/stl.h
@@ -377,7 +377,11 @@ 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;
 }