Makes decltype on a call expression not require the return type to be complete (US22/DE9).
Other papers in auto, decltype & trailing return types
N1984Deducing the type of variable from its initializer expression (revision 4)Berlin 2006N2194decltype for the C++0x Standard LibraryToronto 2007N2343Decltype (revision 7): proposed wordingToronto 2007N2541New Function Declarator Syntax WordingBellevue 2008N3049Core issues 743 and 950: Additional decltype(...) uses (Revision 1)Pittsburgh 2010N3282Type of class member in trailing-return-type/Member access transformation in unevaluated operandsMadrid 2011All 7 papers in auto, decltype & trailing return types →