https://bugs.llvm.org/show_bug.cgi?id=37822
Bug ID: 37822
Summary: An unfixed bug?
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: zhong...@pku.org.cn
CC: dgre...@apple.com, llvm-bugs@lists.llvm.org
The code is as follow:
template<bool, typename> struct enable_if {};
template<typename T> struct enable_if<true,T> {
typedef T type;
};
template<typename _Tp, int _Nm> struct array {
void at(int n) {
_M_check<_Nm>(n);
}
template<int _Mm> typename enable_if<_Mm, void>::type _M_check(int) const { }
// template<int _Mm> typename enable_if<_Mm!=0, void>::type _M_check(int)
const { }
};
int main(){
array<double,3> a;
a.at(0);
}
It comes from a previous bug report: https://bugs.llvm.org/show_bug.cgi?id=8650
It is said to be fixed. However, when I compile the above code with the latest
clang++, it produces the following errors:
/home/haozhong/project/approach/otherreport/llvm/tmp/llvm_8650/code0.c.cpp:7:2:
error: no matching member function for call to '_M_check'
_M_check<_Nm>(n);
^~~~~~~~~~~~~
/home/haozhong/project/approach/otherreport/llvm/tmp/llvm_8650/code0.c.cpp:14:4:
note: in instantiation of member function 'array<double, 3>::at' requested here
a.at(0);
^
/home/haozhong/project/approach/otherreport/llvm/tmp/llvm_8650/code0.c.cpp:9:56:
note: candidate template ignored: substitution failure [with _Mm = 3]: non-type
template argument evaluates to 3, which cannot be narrowed to type 'bool'
template<int _Mm> typename enable_if<_Mm, void>::type _M_check(int) const
{ }
~~~ ^
1 error generated.
Is the bug not fully fixed?
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