D14956: avoid any heap allocation for default constructed Format() as used as "invalid"

[Volker Krause]

vkrause added a comment.


  A shared static null object should work with QExplicitlySharedDataPointer as with any other d pointer type: just copy the null object into d in the default ctor. Trades the conditions per call for an atomic increment/decrement per instance.

REPOSITORY
  R216 Syntax Highlighting

REVISION DETAIL
  https://phabricator.kde.org/D14956

To: cullmann, vkrause
Cc: dhaumann, kwrite-devel, kde-frameworks-devel, michaelh, kevinapavew, ngraham, bruns, demsking, cullmann, sars
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