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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Adding static_asserts suppresses errors"
href="http://llvm.org/bugs/show_bug.cgi?id=19385">19385</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Adding static_asserts suppresses errors
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.4
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<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++11
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jw2wjw2@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=12359" name="attach_12359" title="File demonstrating the bug">attachment 12359</a> <a href="attachment.cgi?id=12359&action=edit" title="File demonstrating the bug">[details]</a></span>
File demonstrating the bug
This program fails to compile with the error:
%%%% clang++ -std=c++11 static_assert.cpp %%%%
static_assert.cpp:17:38: error: no matching function for call to 'memoize'
std::cout << "1+" << val <<" = " << memoize<decltype(&increment),
int>(increment,std::move(val)) << std::endl;
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
static_assert.cpp:6:1: note: candidate template ignored: substitution failure
[with function_t = int (*)(int), Args = <int>]: implicit instantiation of
undefined template 'std::result_of<int (*(int))(int)>'
memoize(function_t f, Args&&...a) {
^
When the debug flag is enabled, compilation succeeds. (clang++ -std=c++11
-DDEBUG static_assert.cpp)
Since the only difference between the two is the presence of a static_assert,
this violates ยง7.0.4: "... If the value of the expression when so converted is
true, the declaration has no effect."</pre>
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