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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Structured bindings on struct failing with clang-cl"
href="https://bugs.llvm.org/show_bug.cgi?id=41701">41701</a>
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<th>Summary</th>
<td>Structured bindings on struct failing with clang-cl
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>7.0
</td>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>jvapen@gmail.com
</td>
</tr>
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
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<p>
<div>
<pre>This issue seems to be specific to building with clang-cl (or link with MSVC
STL).
I've tested it on version 7.0.0 with MSVC2017.
I'm using the example of
<a href="https://en.cppreference.com/w/cpp/language/structured_binding">https://en.cppreference.com/w/cpp/language/structured_binding</a>, which works with
MSVC and Clang on linux. (See <a href="https://gcc.godbolt.org/z/EW5TN">https://gcc.godbolt.org/z/EW5TN</a>-), however, fails
with clang-cl.
t.cpp
-----
struct S {
int x1 : 2;
volatile double y1;
};
S f();
const auto [x, y] = f(); // x is a const int lvalue identifying the 2-bit bit
field
// y is a const volatile double lvalue
run.bat
-------
clang-cl.exe /O2 /std:c++17 t.cpp
error:
------
t.cpp(7,11): error: cannot decompose this type; 'std::tuple_size<const
S>::value' is not a valid integral constant expression
const auto[x, y] = f(); // x is a const int lvalue identifying the 2-bit bit
field
^
1 error generated.</pre>
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