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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Parallel algorithms fail to enforce Mandates: requirements"
href="https://bugs.llvm.org/show_bug.cgi?id=48557">48557</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Parallel algorithms fail to enforce Mandates: requirements
</td>
</tr>
<tr>
<th>Product</th>
<td>parallel STL
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</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>
<tr>
<th>Component</th>
<td>New
</td>
</tr>
<tr>
<th>Assignee</th>
<td>ldionne@apple.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>zilla@kayari.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>For example:
Mandates: All of
— binary_op(init, init),
— binary_op(init, unary_op(*first)),
— binary_op(unary_op(*first), init), and
— binary_op(unary_op(*first), unary_op(*first))
are convertible to T.
This was stated with "Requires:" in C++17, but in C++20 violating the
requirement must be diagnosed.
Example:
#include <numeric>
#include <execution>
int main() {
int a[]{ 1 };
auto r = std::transform_reduce(
std::execution::seq, a, a+1, 0,
[](int& a, int b) {
return a + b;
},
[](int i) { return i; });
}
This compiles without error using GCC's copy of the PSTL code.</pre>
</div>
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