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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - static constexpr data member of non static member not considered constant"
href="https://bugs.llvm.org/show_bug.cgi?id=35390">35390</a>
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<th>Summary</th>
<td>static constexpr data member of non static member not considered constant
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>5.0
</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++
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mpscogg@sandia.gov
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>/********************************************
The following code works and works as expected in g++, and not in clang++
The template is not necessary for the failure,
*********************************************/
template <unsigned int const SIGNAL_HASH>
class EventBase
{
public:
static constexpr unsigned int const signal { SIGNAL_HASH };
};
class Actor
{
public:
EventBase<42> actor_event;
int processEvent(unsigned int const _event)
{
switch(_event){
case actor_event.signal: //Compiles in g++ and NOT clang++
break;
default:
return 1;
}
return 0;
}
};
int main() {
}
/****************************************
Ubuntu14.04.1
g++ 5.4.1
clang++-5.0/6.0
CXX -std=c++14 clang-constexpr-switch-error.cpp
error:
clang-test-T.cpp:16:12: error: case value is not a constant expression
case actor_event.signal: //Compiles in g++ and NOT clang++
^~~~~~~~~~~~~~~~~~
clang-test-T.cpp:16:12: note: implicit use of 'this' pointer is only allowed
within the evaluation of a call to a 'constexpr' member function
*******************************************/</pre>
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