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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Clang-CL diagnoses ternary ambiguity which cl.exe allows"
href="https://llvm.org/bugs/show_bug.cgi?id=31816">31816</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Clang-CL diagnoses ternary ambiguity which cl.exe allows
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows NT
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>steveire@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Given
struct MyBool
{
MyBool(bool b = false) {}
operator bool() const { return false; }
};
int main()
{
MyBool mb;
bool result = true ? false : mb;
return 0;
}
C:\dev\tmp>cl /c main.cpp
Microsoft (R) C/C++ Optimizing Compiler Version 19.00.24325.6 for x86
Copyright (C) Microsoft Corporation. All rights reserved.
main.cpp
C:\dev\tmp>"c:\dev\src\llvm\build\Release\msbuild-bin\cl.exe" /c main.cpp
main.cpp(11,21): error: conditional expression is ambiguous; 'bool' can be
converted to 'MyBool' and vice versa
bool result = true ? false : mb;
^ ~~~~~ ~~
1 error generated.
It could be considered to match the behavior of cl.exe</pre>
</div>
</p>
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