C++: Add a clarifying comment and TODO
C++: Add a clarifying comment and TODO

Change-Id: If6e6db7c4ca011159e78a27755ff9f665b179300
Reviewed-by: Wang Hoi <9a66326c311f9167f10fbc9ee0d2307d5357a18c@126.com>
Reviewed-by: Erik Verbruggen <5edfe905d082749f2ac3f4e6b42937f39f083771@digia.com>

farseerri/git_code,xianian/qt-creator,Distrotech/qtcreator,kuba1/qtcreator,farseerri/git_code,AltarBeastiful/qt-creator,danimo/qt-creator,amyvmiwei/qt-creator,danimo/qt-creator,Distrotech/qtcreator,AltarBeastiful/qt-creator,xianian/qt-creator,martyone/sailfish-qtcreator,kuba1/qtcreator,martyone/sailfish-qtcreator,Distrotech/qtcreator,martyone/sailfish-qtcreator,kuba1/qtcreator,danimo/qt-creator,AltarBeastiful/qt-creator,danimo/qt-creator,amyvmiwei/qt-creator,Distrotech/qtcreator,kuba1/qtcreator,farseerri/git_code,danimo/qt-creator,maui-packages/qt-creator,Distrotech/qtcreator,AltarBeastiful/qt-creator,farseerri/git_code,maui-packages/qt-creator,amyvmiwei/qt-creator,xianian/qt-creator,farseerri/git_code,martyone/sailfish-qtcreator,AltarBeastiful/qt-creator,martyone/sailfish-qtcreator,kuba1/qtcreator,xianian/qt-creator,maui-packages/qt-creator,maui-packages/qt-creator,Distrotech/qtcreator,danimo/qt-creator,AltarBeastiful/qt-creator,AltarBeastiful/qt-creator,kuba1/qtcreator,kuba1/qtcreator,amyvmiwei/qt-creator,AltarBeastiful/qt-creator,martyone/sailfish-qtcreator,maui-packages/qt-creator,amyvmiwei/qt-creator,maui-packages/qt-creator,danimo/qt-creator,maui-packages/qt-creator,xianian/qt-creator,xianian/qt-creator,Distrotech/qtcreator,danimo/qt-creator,farseerri/git_code,amyvmiwei/qt-creator,xianian/qt-creator,danimo/qt-creator,martyone/sailfish-qtcreator,xianian/qt-creator,farseerri/git_code,kuba1/qtcreator,xianian/qt-creator,martyone/sailfish-qtcreator,martyone/sailfish-qtcreator,kuba1/qtcreator,amyvmiwei/qt-creator,farseerri/git_code,amyvmiwei/qt-creator