<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 --- - Class constructor default argument fails to compile"
href="http://llvm.org/bugs/show_bug.cgi?id=15686">15686</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Class constructor default argument fails to compile
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</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>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>MyAdEss@seznam.cz
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>If a class constructor has an argument that takes a default value that itself
is a template of more than one parameter, it fails to compile.
Example of a full program:
<a href="http://ideone.com/mv9Qco">http://ideone.com/mv9Qco</a>
/***************************************************/
#include <functional>
using namespace std;
/* a function template */
template <typename A, typename B>
A f(B) { return A(); }
/* a class template */
template <typename A, typename B>
class X {};
template <typename A, typename B>
class Y
{
/** All these constructors fail to compile **/
Y(X<A,B> = X<A,B>())
//Y(A (*arg)(B) = f<A, B>)
//Y(std::function<A(B)> arg = f<A, B>)
{ }
};
int main()
{ return 0; }
/***************************************************/
It compiles successfully on GCC and MSVC.
Compiler error:
clangtest.cpp:17:19: error: expected ')'
Y(X<A,B> = X<A,B>())
^
clangtest.cpp:17:4: note: to match this '('
Y(X<A,B> = X<A,B>())
^
clangtest.cpp:17:17: error: expected '>'
Y(X<A,B> = X<A,B>())
^
2 errors generated.
--Floop</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>