https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86298
Bug ID: 86298
Summary: template argument cannot be narrowed to type 'int'
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: zhonghao at pku dot org.cn
Target Milestone: ---
The code is as follow:
template <typename ,int, int = 9223372036854775807L >
struct as_nview { };
template <typename Sequence, int I0>
struct as_nview<Sequence, I0>
{ };
g++ produces only a warning message, and it points to a wrong location:
warning: overflow in conversion from 'long int' to 'int' changes value from
'9223372036854775807' to '-1' [-Woverflow]
struct as_nview<Sequence, I0>
^
Instead, clang++ rejects the code:
error: non-type template argument evaluates to
9223372036854775807, which cannot be narrowed to type 'int'
[-Wc++11-narrowing]
template <typename ,int, int = 9223372036854775807L >
The error message of clang++ seem to be more reasonable, right?
