From 334d4c7b69c0feb63744f04e1fc46a84996a481a Mon Sep 17 00:00:00 2001
From: Marc Mutz <marc.mutz@qt.io>
Date: Tue, 18 Jun 2024 17:06:03 +0200
Subject: [PATCH] qfloat16format.h: fix compilation

You can't specialize a class using a qualified name as class-name.
Open and close namespace std instead.

The std:: qualification on the base class is ok, so leave it. Prevents
accidental picking up of a non-std formatting struct.

Amends ffac33964d51971a1c1f61308b6f0a60a4133296.

Pick-to: 6.8
Task-number: QTBUG-104654
Task-number: QTBUG-126385
Change-Id: I92e1b02b0e8b8676c5750c8f9621ae262c53b946
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
---
 src/corelib/io/qfloat16format.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/corelib/io/qfloat16format.h b/src/corelib/io/qfloat16format.h
index 2d507800b62..96b3fdab767 100644
--- a/src/corelib/io/qfloat16format.h
+++ b/src/corelib/io/qfloat16format.h
@@ -45,8 +45,9 @@ using QFloat16FormatterBaseType =
 
 QT_END_NAMESPACE
 
+namespace std {
 template <typename CharT>
-struct std::formatter<QT_PREPEND_NAMESPACE(qfloat16), CharT>
+struct formatter<QT_PREPEND_NAMESPACE(qfloat16), CharT>
     : std::formatter<QT_PREPEND_NAMESPACE(QtPrivate::QFloat16FormatterBaseType<CharT>), CharT>
 {
     template <typename FormatContext>
@@ -56,6 +57,7 @@ struct std::formatter<QT_PREPEND_NAMESPACE(qfloat16), CharT>
         return std::formatter<FloatType, CharT>::format(FloatType(val), ctx);
     }
 };
+} // namespace std
 
 #endif // QT_SUPPORTS_STD_FORMAT