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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang rejects valid code for error: no viable constructor or deduction guide for deduction"
href="https://bugs.llvm.org/show_bug.cgi?id=47352">47352</a>
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<th>Summary</th>
<td>clang rejects valid code for error: no viable constructor or deduction guide for deduction
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>tangyixuan@mail.dlut.edu.cn
</td>
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>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 (<a href="https://github.com/llvm/llvm-project.git">https://github.com/llvm/llvm-project.git</a>
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.</pre>
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