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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang does not correctly compile constexpr function for literal types that have a non-constexpr copy constructor"
href="http://llvm.org/bugs/show_bug.cgi?id=21103">21103</a>
</td>
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<th>Summary</th>
<td>clang does not correctly compile constexpr function for literal types that have a non-constexpr copy constructor
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<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>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++11
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>ryan.burn@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>clang gives an error when compiling the code below.
But this should be valid c++ code, since B<-1> is a literal_type and the
requirements for f being a constexpr function call should be met. (also it
compiles with g++)
#include <array>
#include <type_traits>
#include <iostream>
template<class T, int N>
class A {
public:
T values[N];
public:
constexpr A() : values{} {}
A(const A&) {}
A(int x) {}
};
template<int... Extents>
class B
: A<int, 10>
{
};
template<class T>
constexpr int f(T) {
return 0;
}
int main() {
std::array<int, f(B<-1>())> a;
// std::cout << std::is_literal_type<B<-1>>::value << "\n"; prints true
return 0;
}</pre>
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