<html>
<head>
<base href="http://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang++ reports substitution failure with incorrect argument list"
href="http://llvm.org/bugs/show_bug.cgi?id=16646">16646</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang++ reports substitution failure with incorrect argument list
</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>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>
<tr>
<th>Component</th>
<td>C++11
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>sandipan.mohanty@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The following code produces a "substitution failure" in clang++ trunk, although
it seems ok and works as expected in GCC.
---- begin example code ---
#include <iostream>
#include <tuple>
template <typename T> struct DefaultValue { const T value=0;};
template <> struct DefaultValue<std::string> { const std::string
value="Uninitialized";};
template <typename ... Args>
using Zero = std::tuple<DefaultValue<Args> ...>;
template <typename ... Args>
void f(const Zero<Args ...> &t)
{
std::cout << sizeof...(Args) << std::endl;
}
int main()
{
Zero<int,double,double> T;
f(T);
// f<int,double,double>(T); // This works
}
---- end example code ---
The compiler error is :
v1.cc:19:5: error: no matching function for call to 'blaha'
blaha(T);
^~~~~
v1.cc:11:6: note: candidate template ignored: substitution failure [with Args =
<int>]
void f(const Zero<Args ...> &t)
^
1 error generated.
Note the "with Args =<int>" part. When I call f with T, Args should be inferred
as <int, double, double>. Shouldn't it ?</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>