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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [windows-only] #include <vector> breaks structured binding for aggregated types"
href="https://bugs.llvm.org/show_bug.cgi?id=41994">41994</a>
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<th>Summary</th>
<td>[windows-only] #include <vector> breaks structured binding for aggregated types
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>8.0
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++17
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>development@jordi.vilar.cat
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<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>The following code, compiled with -std=c++17, fails in windows build of
clang-8, compiles correctly in linux build of the same clang version. The
diagnostics message says:
error: cannot decompose this type; 'std::tuple_size<const
aggregated_type>::value' is not a valid integral constant expression
#include <vector>
struct aggregated_type
{
double a, b, c, d;
};
int main(int, char**)
{
const aggregated_type aggregate{};
const auto&[a, b, c, d] = aggregate;
}
commenting out the #include <vector> line, compiles as expected</pre>
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