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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Non-type template argument parse error"
href="https://bugs.llvm.org/show_bug.cgi?id=48090">48090</a>
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<th>Summary</th>
<td>Non-type template argument parse error
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows XP
</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>oleg-derevenetz@yandex.ru
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Consider the following code:
namespace BitOp
{
enum Op
{
Copy
};
};
template<typename T>
class Bits
{
public:
template <BitOp::Op op = BitOp::Copy>
static T& bitop(T& dst, T src) {
if (op == BitOp::Copy)
dst = src;
return dst;
};
};
template<typename T>
struct Bitmap3D
{
template <BitOp::Op op = BitOp::Copy>
void exportBits(T* bits) const
{
Bits<T>::bitop<op>(bits[0], bits[0]);
};
};
int main(int, char *[])
{
Bitmap3D<int> bm3d;
int *bits;
bm3d.exportBits(bits);
}
It fails to compile with the following error:
<source>:27:18: error: reference to overloaded function could not be resolved;
did you mean to call it?
Bits<T>::bitop<op>(bits[0], bits[0]);
~~~~~~~~~^~~~~
<source>:36:10: note: in instantiation of function template specialization
'Bitmap3D<int>::exportBits<BitOp::Copy>' requested here
bm3d.exportBits(bits);
^
<source>:14:15: note: possible target for call
static T& bitop(T& dst, T src) {
^
1 error generated.
This code compiles just fine with MSVC 19.27 though:
<a href="https://godbolt.org/z/KqMKnv">https://godbolt.org/z/KqMKnv</a>
It seems that clang parser interprets "Bits<T>::bitop<op" part like call of
operator<(Bits<T>::bitop, op), but it's just a guess.</pre>
</div>
</p>
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