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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Better error message when missing #include<new> and using placement new"
href="https://bugs.llvm.org/show_bug.cgi?id=49260">49260</a>
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<th>Summary</th>
<td>Better error message when missing #include<new> and using placement new
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>All
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>kirshamir@gmail.com
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
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<pre>Use of placement new requires #include <new>
Without this include the error message is something like:
error: no matching function for call to 'operator new'
new (this) A(other);
^ ~~~~~~
note: candidate function not viable: no known conversion from 'A *' to
'std::align_val_t' for 2nd argument
note: candidate function not viable: requires 1 argument, but 2 were provided
Many std headers have #include <new> thus users just usually write placement
new without a special include and everything works fine, but when code moves
around above error message may just pop up.
A better error might be:
error: no matching function for call to 'operator new'
new (this) A(other);
^ ~~~~~~
Note: use of placement new requires #include <new>
...</pre>
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