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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - creating object of abstract class allowed in all versions of clang++"
href="https://llvm.org/bugs/show_bug.cgi?id=27637">27637</a>
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<th>Summary</th>
<td>creating object of abstract class allowed in all versions of clang++
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.8
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>pravasimeet999@yahoo.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=16308" name="attach_16308" title="bug in clang++">attachment 16308</a> <a href="attachment.cgi?id=16308&action=edit" title="bug in clang++">[details]</a></span>
bug in clang++
clang++ compiles ill formed C++ program successfully.
The following program is ill formed C++ program because it is not allowed to
create objects of abstract class. But in all versions of g++ the program
compiles successfully.
This question originally asked on stackoverflow by user Matt. See here:
<a href="http://stackoverflow.com/questions/37017094/why-do-gcc-and-clang-allow-me-to-construct-an-abstract-class">http://stackoverflow.com/questions/37017094/why-do-gcc-and-clang-allow-me-to-construct-an-abstract-class</a>
.
(See live demo here: <a href="http://melpon.org/wandbox/permlink/uT43g5lw26HWAbog">http://melpon.org/wandbox/permlink/uT43g5lw26HWAbog</a> )
#include <stdio.h>
class A
{
public:
A() {
printf("A()\n");
}
virtual void b() const = 0;
};
int main()
{
const A& a{};
a.b();
return 0;
}
The program is clearly invalid & implementation is required to produce a
diagnosis for this according to C++ standard.</pre>
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