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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Initializer list {{}} for tuple<tuple<>&&> fails but succeeds for tuple<tuple<> const &>"
href="https://bugs.llvm.org/show_bug.cgi?id=38409">38409</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Initializer list {{}} for tuple<tuple<>&&> fails but succeeds for tuple<tuple<> const &>
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Macintosh
</td>
</tr>
<tr>
<th>OS</th>
<td>MacOS X
</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>davidfink314@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=20630" name="attach_20630" title="program demonstrating the bug">attachment 20630</a> <a href="attachment.cgi?id=20630&action=edit" title="program demonstrating the bug">[details]</a></span>
program demonstrating the bug
Attempting to compile the attached file yields the following error.
Note that a temporary tuple binding to const & works (y), but it errors out
trying to bind to && (x).
This error is from Apple LLVM version 9.0.0 (clang-900.0.38),
but this is reproducible in clang (trunk) on godbolt.org.
clang_rvalue_bug.cpp:7:22: error: no matching constructor for initialization of
'tuple<tuple<> &&>'
tuple<tuple<>&&> x{{}};
^~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/tuple:620:5:
note:
candidate constructor not viable: cannot convert initializer list
argument to 'const
std::__1::tuple<std::__1::tuple<> &&>'
tuple(tuple const&) = default;
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/tuple:621:5:
note:
candidate constructor not viable: cannot convert initializer list
argument to
'std::__1::tuple<std::__1::tuple<> &&>'
tuple(tuple&&) = default;
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/tuple:827:9:
note:
candidate template ignored: couldn't infer template argument '_Tuple'
tuple(_Tuple&& __t) _NOEXCEPT_((is_nothrow_constructible<base,
_Tuple>::value))
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/tuple:842:9:
note:
candidate template ignored: couldn't infer template argument '_Tuple'
tuple(_Tuple&& __t) _NOEXCEPT_((is_nothrow_constructible<base,
_Tuple>::value))
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/tuple:639:26:
note:
candidate template ignored: disabled by 'enable_if' [with _Dummy = true]
_CheckArgsConstructor<
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/tuple:657:26:
note:
candidate template ignored: disabled by 'enable_if' [with _Dummy = true]
_CheckArgsConstructor<
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/tuple:715:26:
note:
candidate template ignored: disabled by 'enable_if' [with _Up = <>,
_PackIsTuple = false]
_CheckArgsConstructor<
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/tuple:747:26:
note:
candidate template ignored: disabled by 'enable_if' [with _Up = <>]
_CheckArgsConstructor<
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/tuple:617:23:
note:
candidate constructor template not viable: requires 0 arguments, but 1
was provided
_LIBCPP_CONSTEXPR tuple()
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/tuple:630:5:
note:
candidate constructor template not viable: requires 2 arguments, but 1
was provided
tuple(_AllocArgT, _Alloc const& __a)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/tuple:682:7:
note:
candidate constructor template not viable: requires 3 arguments, but 1
was provided
tuple(allocator_arg_t, const _Alloc& __a, const _Tp& ... __t)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/tuple:702:7:
note:
candidate constructor template not viable: requires 3 arguments, but 1
was provided
tuple(allocator_arg_t, const _Alloc& __a, const _Tp& ... __t)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/tuple:788:9:
note:
candidate constructor template not viable: requires at least 2 arguments,
but 1 was provided
tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/tuple:808:9:
note:
candidate constructor template not viable: requires at least 2 arguments,
but 1 was provided
tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/tuple:855:9:
note:
candidate constructor template not viable: requires 3 arguments, but 1
was provided
tuple(allocator_arg_t, const _Alloc& __a, _Tuple&& __t)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/tuple:869:9:
note:
candidate constructor template not viable: requires 3 arguments, but 1
was provided
tuple(allocator_arg_t, const _Alloc& __a, _Tuple&& __t)</pre>
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