[Bug c++/86596] New: non-type template argument evaluates to an integer

zhonghao at pku dot org.cn gcc-bugzilla@gcc.gnu.org
Fri Jul 20 00:41:00 GMT 2018


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86596

            Bug ID: 86596
           Summary: non-type template argument evaluates to an integer
           Product: gcc
           Version: 9.0
            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<char i> struct A {};

typedef A<255> B;

int main() { return 0; }

g++ accepts the code, but clang++ rejects it:

char.cpp:3:11: error: non-type template argument evaluates to 255, which
      cannot be narrowed to type 'char' [-Wc++11-narrowing]
typedef A<255> B;
          ^
1 error generated.


The code looks illegal, so the diagnose of clang++ is right?


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