https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71223
Bug ID: 71223
Summary: [fold expression] Incorrect processing a fold
expression
Product: gcc
Version: 6.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: sergstrukovlink at gmail dot com
Target Milestone: ---
Created attachment 38539
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38539&action=edit
example
In the attached example compiler fails to compile the following line
Test2<short,int,long>(); // emits error
If I change the definition of
template <class T>
using AddType = TypeBox<T> ; // int
to
template <class T>
using AddType = int ;
the error disappeares.
main.cpp: In instantiation of 'struct Test2<short int, int, long int>':
main.cpp:41:25: required from here
main.cpp:23:74: error: invalid use of pack expansion expression
using IndexList = decltype( ( IndexListBox<>() + ... + AddType<TT>() ) ) ;
^
make: *** [main.o] Error 1
