optimise find/insert pattern

if we're doing a find/insert on a set or a map, it is better to just do
a conditional insert/emplace operation than triggering two lookups.

Change-Id: I80da5097f5a89fe30fa348ce5b6e747c34287a8d
Reviewed-on: https://gerrit.libreoffice.org/70937
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

1 files changed, 1 insertions, 3 deletions

diff --git a/sc/source/filter/excel/xestyle.cxx b/sc/source/filter/excel/xestyle.cxx
index 1af2b2187149..9e48fd5fc7b2 100644
--- a/sc/source/filter/excel/xestyle.cxx
+++ b/sc/source/filter/excel/xestyle.cxx
@@ -3020,10 +3020,8 @@ XclExpDxfs::XclExpDxfs( const XclExpRoot& rRoot )
                         aStyleName = pEntry->GetStyleName();
                     }
 
-                    if (maStyleNameToDxfId.find(aStyleName) == maStyleNameToDxfId.end())
+                    if (maStyleNameToDxfId.emplace(aStyleName, nIndex).second)
                     {
-                        maStyleNameToDxfId.insert(std::pair<OUString, sal_Int32>(aStyleName, nIndex));
-
                         SfxStyleSheetBase* pStyle = rRoot.GetDoc().GetStyleSheetPool()->Find(aStyleName);
                         if(!pStyle)
                             continue;