A more lightweight O[U]StringConcatenation

...compared to a full-blown O[U]String, for temporary objects holding an
O[U]StringConcat result that can then be used as a std::[u16]string_view.

It's instructive to see how some invocations of operator ==, operator !=, and
O[U]StringBuffer::insert with an O[U]StringConcat argument required implicit
materialization of an O[U]String temporary, and how that expensive operation has
now been made explicit with the explicit O[U]StringConcatenation ctor.

(The additional operator == and operator != overloads are necessary because the
overloads taking two std::[u16]string_view parameters wouldn't even be found
here with ADL.  And the OUString-related ones would cause ambiguities in at
least sal/qa/rtl/strings/test_oustring_stringliterals.cxx built with
RTL_STRING_UNITTEST, so have simply been disabled for that special test-code
case.)

Change-Id: Id29799fa8da21a09ff9794cbc7cc9b366e6803b8
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/122890
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/svtools/source/svhtml/HtmlWriter.cxx b/svtools/source/svhtml/HtmlWriter.cxx
index 8cd7dc8705b4..f7c35a644706 100644
--- a/svtools/source/svhtml/HtmlWriter.cxx
+++ b/svtools/source/svhtml/HtmlWriter.cxx
@@ -52,7 +52,7 @@ void HtmlWriter::start(const OString& aElement)
     }
 
     mrStream.WriteChar('<');
-    mrStream.WriteOString(OString(maNamespace + aElement));
+    mrStream.WriteOString(OStringConcatenation(maNamespace + aElement));
     mbElementOpen = true;
 }
 
@@ -107,7 +107,7 @@ void HtmlWriter::end()
             }
         }
         mrStream.WriteCharPtr("</");
-        mrStream.WriteOString(OString(maNamespace + maElementStack.back()));
+        mrStream.WriteOString(OStringConcatenation(maNamespace + maElementStack.back()));
         mrStream.WriteCharPtr(">");
         if (mbPrettyPrint)
             mrStream.WriteCharPtr("\n");