From 45c4f2039b2fbee26e88971fceae39834f7a7b95 Mon Sep 17 00:00:00 2001
From: Kefu Chai <kefu.chai@scylladb.com>
Date: Sat, 20 Jan 2024 14:43:40 +0800
Subject: [PATCH] cql3: add formatter for cql3::ut_name

before this change, we rely on the default-generated fmt::formatter
created from operator<<, but fmt v10 dropped the default-generated
formatter.

in this change, we define a formatter for cql3::ut_name, and remove
their operator<<().

Refs #13245

Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>

Closes scylladb/scylladb#16890
---
 cql3/ut_name.hh | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/cql3/ut_name.hh b/cql3/ut_name.hh
index f73f612104..37860fabd3 100644
--- a/cql3/ut_name.hh
+++ b/cql3/ut_name.hh
@@ -12,6 +12,7 @@
 
 #include <seastar/core/shared_ptr.hh>
 #include <seastar/core/sstring.hh>
+#include <fmt/core.h>
 #include "seastarx.hh"
 #include "bytes.hh"
 
@@ -38,10 +39,13 @@ public:
     sstring get_string_type_name() const;
 
     sstring to_cql_string() const;
-
-    friend std::ostream& operator<<(std::ostream& os, const ut_name& n) {
-        return os << n.to_cql_string();
-    }
 };
 
 }
+
+template <> struct fmt::formatter<cql3::ut_name> {
+    constexpr auto parse(format_parse_context& ctx) { return ctx.begin(); }
+    auto format(const cql3::ut_name& n, fmt::format_context& ctx) const {
+        return fmt::format_to(ctx.out(), "{}", n.to_cql_string());
+    }
+};