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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - std::basic_stringbuf only works with DefaultConstructible allocators"
href="https://bugs.llvm.org/show_bug.cgi?id=33727">33727</a>
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<th>Summary</th>
<td>std::basic_stringbuf only works with DefaultConstructible allocators
</td>
</tr>
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<th>Product</th>
<td>libc++
</td>
</tr>
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<th>Version</th>
<td>4.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<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>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>zilla@kayari.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
</tr></table>
<p>
<div>
<pre>This doesn't compile:
#include <memory>
#include <sstream>
#include <cassert>
template<typename T>
struct Alloc : std::allocator<T>
{
template<typename U> struct rebind { using other = Alloc<U>; };
Alloc(int id) : id(id) { }
template<typename U> Alloc(const Alloc<U>& a) : id(a.id) { }
int id;
};
using string = std::basic_string<char, std::char_traits<char>, Alloc<char>>;
using stringbuf = std::basic_stringbuf<char, std::char_traits<char>,
Alloc<char>>;
int main()
{
string s(Alloc<char>(1));
stringbuf b(s);
assert( b.str().get_allocator() == s.get_allocator() );
}
The basic_stringbuf constructor default-initializes its basic_string member,
which default-initializes its allocator.</pre>
</div>
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