OUStringBuffer: add append via operator<<(T&&)

... and use it to implement SalFrame::DumpSetPosSize.

Change-Id: I82301f7e1f6641d6167c9577ce9ef44ef8067297
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/135808
Tested-by: Jenkins
Reviewed-by: Jan-Marek Glogowski <glogow@fbihome.de>

1 files changed, 15 insertions, 0 deletions

diff --git a/include/rtl/ustrbuf.hxx b/include/rtl/ustrbuf.hxx
index 8c8cc54f8f01..605fb1efb6d0 100644
--- a/include/rtl/ustrbuf.hxx
+++ b/include/rtl/ustrbuf.hxx
@@ -34,6 +34,7 @@
 #if defined LIBO_INTERNAL_ONLY
 #include <string_view>
 #include <type_traits>
+#include <utility>
 #endif
 
 #include "rtl/ustrbuf.h"
@@ -974,6 +975,20 @@ public:
         return pData->buffer + n;
     }
 
+#if defined LIBO_INTERNAL_ONLY
+    /**
+       "Stream" operator to append a value to this OUStringBuffer.
+
+       @internal
+       @since LibreOffice 7.5
+     */
+    template<typename T>
+    OUStringBuffer& operator<<(T&& rValue)
+    {
+        return append(std::forward<T>(rValue));
+    }
+#endif
+
     /**
         Inserts the string into this string buffer.