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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - No Warning when converting an array of a subclass to its parent"
href="https://llvm.org/bugs/show_bug.cgi?id=25816">25816</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>No Warning when converting an array of a subclass to its parent
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>3.7
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</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>llvm-bugs@bluematt.me
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Without bringing up the deadly "warn when using arrays in function
declarations" quagmire, if you are converting an array of one type to that of
another due to pointer decay, there should probably at least be a huge warning.
eg the following prints "1 2" to the surprise of many unthinking programmers.
#include <stdio.h>
class A {
public:
int a;
};
class B : public A {
public:
int b;
};
void go(A b[2]) {
fprintf(stderr, "%d %d\n", b[0].a, b[1].a);
}
int main() {
B bs[2];
bs[0].a = 1;
bs[0].b = 2;
bs[1].a = 3;
bs[1].b = 4;
go(bs);
}</pre>
</div>
</p>
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