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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - explicit refuses the call to other implicit constructors"
href="https://bugs.llvm.org/show_bug.cgi?id=42317">42317</a>
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<th>Summary</th>
<td>explicit refuses the call to other implicit constructors
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</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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<tr>
<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>zhonghao@pku.org.cn
</td>
</tr>
<tr>
<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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<p>
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<pre>My clang is 9.0.0, and the code is:
struct A;
struct B
{
B(A const &);
B(B const &);
};
struct A
{
A(B) {}
};
B f(A const &a) {
B r(a);
return r;
}
clang accepts the code, but after I modify it to:
struct A;
struct B
{
B(A const &);
explicit B(B const &);
};
struct A
{
A(B) {}
};
B f(A const &a) {
B r(a);
return r;
}
clang rejects it:
<source>:16:10: error: no matching constructor for initialization of 'B'
return r;
^
<source>:5:2: note: candidate constructor not viable: no known conversion from
'B' to 'const A &' for 1st argument
B(A const &);
^
<source>:11:5: note: passing argument to parameter here
A(B) {}
^
1 error generated.
Compiler returned: 1
It is strange to refuse the call to B(A const &), after I modify to the other
constructor to explicit. The buggy location is also strange, since return r
does not call any constructors.
BTW, gcc accepts both code samples.</pre>
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