https://bugs.llvm.org/show_bug.cgi?id=47352
Bug ID: 47352
Summary: clang rejects valid code for error: no viable
constructor or deduction guide for deduction
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: tangyix...@mail.dlut.edu.cn
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
g++ compiles the code successfully, while clang++ rejects it.
$ cat s.cpp
template < int I > struct int_{};
template < typename T >
struct A{
template < typename U, int I >
struct B{
B(U u, int_< I >){}
};
};
int main(){
A< int >::B v(0, int_< 0 >());
(void)v;
}
$ clang -v
clang version 11.0.0 (https://github.com/llvm/llvm-project.git
ab4627364aefcaac751e757b721b7d07b48a545a)
Target: x86_64-unknown-linux-gnu
Thread model: posix
$ clang++ -c s.cpp
s.cpp:13:17: error: no viable constructor or deduction guide for deduction of
template arguments of 'B'
A< int >::B v(0, int_< 0 >());
^
s.cpp:6:12: note: candidate function template not viable: requires 1 argument,
but 2 were provided
struct B{
^
s.cpp:6:12: note: candidate function template not viable: requires 0 arguments,
but 2 were provided
1 error generated.
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