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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Calling make_shared<int> with a unique_ptr<int>&& should not compile"
href="http://llvm.org/bugs/show_bug.cgi?id=17295">17295</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Calling make_shared<int> with a unique_ptr<int>&& should not compile
</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>ali.baharev@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 compiles without any warning.
#include <iostream>
#include <memory>
int main()
{
std::unique_ptr<int> u_ptr(new int(42));
std::cout << " u_ptr.get() = " << u_ptr.get() << std::endl;
std::cout << "*u_ptr = " << *u_ptr << std::endl;
auto s_ptr = std::make_shared<int>(std::move(u_ptr));
std::cout << "After move" << std::endl;
std::cout << " u_ptr.get() = " << u_ptr.get() << std::endl;
std::cout << "*u_ptr = " << *u_ptr << std::endl;
std::cout << " s_ptr.get() = " << s_ptr.get() << std::endl;
std::cout << "*s_ptr = " << *s_ptr << std::endl;
}
It prints:
u_ptr.get() = 0x1a5c010
*u_ptr = 42
After move
u_ptr.get() = 0x1a5c010
*u_ptr = 42
s_ptr.get() = 0x1a5c048
*s_ptr = 1
I believe the above code should not compile, int doesn't have ctor taking
unique_ptr<int>&& as an argument. GCC 4.7.2 rejects the above code with the
following error:
/usr/include/c++/4.7/ext/new_allocator.h:110:4: error: invalid user-defined
conversion from ‘std::unique_ptr<int>’ to ‘int’ [-fpermissive]
In file included from /usr/include/c++/4.7/memory:86:0,
from ptr.cpp:2:
/usr/include/c++/4.7/bits/unique_ptr.h:233:16: note: candidate is:
std::unique_ptr<_Tp, _Dp>::operator bool() const [with _Tp = int; _Dp =
std::default_delete<int>] <near match>
/usr/include/c++/4.7/bits/unique_ptr.h:233:16: note: return type ‘bool’ of
explicit conversion function cannot be converted to ‘int’ with a qualification
conversion</pre>
</div>
</p>
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