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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Clang does not find begin/end of std::array wrapped in range view"
href="https://bugs.llvm.org/show_bug.cgi?id=45841">45841</a>
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<th>Summary</th>
<td>Clang does not find begin/end of std::array wrapped in range view
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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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++2a
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>rhalbersma@gmail.com
</td>
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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 compiles on GCC-10 (which now implements the <ranges>
header) and produces 3,2,1 as output.
#include <array>
#include <iostream>
#include <ranges>
int main()
{
auto arr = std::array{1, 2, 3};
for (auto elem: std::ranges::reverse_view(arr)) {
std::cout << elem << ",";
}
}
Compiling this with Clang-trunk on godbolt.org (<a href="https://godbolt.org/z/UA7W_E">https://godbolt.org/z/UA7W_E</a>)
gives an error that it cannot find begin/end of the std::array wrapped in the
std::ranges::reverse_view adaptor, apparently because of misunderstood
deduction guide:
while substituting deduced template arguments into function template
'<deduction guide for reverse_view>' [with _Range = std::array<int, 3> &]</pre>
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