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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Should LFTS be restricted to C++14?"
href="https://llvm.org/bugs/show_bug.cgi?id=23338">23338</a>
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<th>Summary</th>
<td>Should LFTS be restricted to C++14?
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<th>Product</th>
<td>libc++
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>PC
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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>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>eric@efcs.ca
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu, mclow.lists@gmail.com
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>We need to decide on a policy for restricting the use of LFTS features. Most of
LFTS can be implemented using only C++11. I think these new features are useful
enough that there is a strong motivation to provide them whenever possible.
So should we allow users to use parts of the LFTS in C++11?
I think the rational for keeping it C++14 only is:
- N4335 references the C++14 standard as its base document
- C++11 should be "stable". Additions added to the language after C++11 not
break valid code.
Some other considerations:
- What restrictions do other standard libraries place on the use of the LFTS?
Should we try and match these restrictions?
- Should including the headers in C++98/C++11 explicitly cause compile errors?
(Similar to how libstdc++ handles C++11 only headers).
I'll write up documentation and rational for whatever we decide here.</pre>
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