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<body><span class="vcard"><a class="email" href="mailto:dblaikie@gmail.com" title="David Blaikie <dblaikie@gmail.com>"> <span class="fn">David Blaikie</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - std::map::emplace calls wrong value type constructor"
href="https://llvm.org/bugs/show_bug.cgi?id=24860">bug 24860</a>
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<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">CC</td>
<td>
</td>
<td>dblaikie@gmail.com
</td>
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<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>INVALID
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - std::map::emplace calls wrong value type constructor"
href="https://llvm.org/bugs/show_bug.cgi?id=24860#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - std::map::emplace calls wrong value type constructor"
href="https://llvm.org/bugs/show_bug.cgi?id=24860">bug 24860</a>
from <span class="vcard"><a class="email" href="mailto:dblaikie@gmail.com" title="David Blaikie <dblaikie@gmail.com>"> <span class="fn">David Blaikie</span></a>
</span></b>
<pre>This seems to be working as intended & doesn't seem to be related to std::map.
Your emplace call is roughly equivalent to this construction of a std::pair:
std::pair<int, Thing> p(0, std::string("hello"));
which exhibits the same compilation error as your std::map::emplace call.
The reason is that std::is_convertible<std::string, Thing>::value is false.
This is because Thing is not copy or move constructible, which is curious, but
technically the way that std::is_convertible is defined:
"the predicate condition for a template specialization is_convertible<From, To>
shall be satisfied if and only if the return expression in the following code
would be well-formed, including any implicit conversions to the return type of
the function:
To test() {
return create<From>();
}"</pre>
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