http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51253
Bug #: 51253
Summary: [C++11][DR 1030] Evaluation order (sequenced-before
relation) among intializer-clauses in braced-init-list
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: ai.az...@gmail.com
Since DR 1030 http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1030
was accepted, I expect that the following code is well-defined and exits with
the status code 0. However, GCC 4.7.0 20111112 (experimental) with -std=c++11
produces a wrong executable. In addition, it spuriously warns about undefined
operations with -Wsequence-point option.
//////////////////////////////////
struct swallow{
template<typename... Types>
swallow(Types &&...){}
};
template<int... IS>
int f()
{
int i = 2;
swallow{ i = i * IS + IS... };
return i;
}
int main()
{
// `i = i * 2 + 2' should be sequenced before `i = i * 3 + 3'
return f<2, 3>() == 21 ? 0 : 1;
}
//////////////////////////////////
