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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang allows creation of objects of abstract class type"
href="https://bugs.llvm.org/show_bug.cgi?id=36429">36429</a>
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<th>Summary</th>
<td>clang allows creation of objects of abstract class type
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>5.0
</td>
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>richard-llvm@metafoo.co.uk
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
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<p>
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<pre>Testcase:
struct Abs { virtual void f() = 0; };
struct C { C(Abs) {} };
struct Q { operator Abs() { __builtin_unreachable(); } };
C c = Q().operator Abs();
At least the second and third lines of this should report an error -- defining
functions that take and return an abstract class type. The fourth line should
likely generate an error too, as it creates an object of abstract class type.
Only the fourth line generates an error, and even that error disappears in
C++17 mode (as no temporary is created, just a parameter object).</pre>
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