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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - SFINAE emits a substitution error even though it shouldn't when checking an overload"
href="http://bugs.llvm.org/show_bug.cgi?id=32179">32179</a>
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<th>Summary</th>
<td>SFINAE emits a substitution error even though it shouldn't when checking an overload
</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>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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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>arphaman@gmail.com
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=18065" name="attach_18065" title="The test file that reproduces the problem">attachment 18065</a> <a href="attachment.cgi?id=18065&action=edit" title="The test file that reproduces the problem">[details]</a></span>
The test file that reproduces the problem
Clang trunk emits a substitution error when checking if a particular overload
of 'invoke' can be selected:
test.cpp:135:50: error: type 'decay_t<double>' (aka 'double') cannot be used
prior to '::' because it has no members
using functor_type = function_traits<decltype(&decay_t<F>::operator())>;
^
test.cpp:184:25: note: in instantiation of template class
'function_traits<double>' requested here
make_index_sequence<function_traits<Functor>::arity> { }))>
^
test.cpp:224:29: note: while substituting deduced template arguments into
function template 'invoke' [with Functor = double, Runpackable = double]
constexpr double result = invoke(test { }, 0.5, 2.5);
Even though we get this SFINAE error, Clang still selects the correct version
of 'invoke' (verified by AST inspection and static assert check).
GCC compiles the test file successfully.</pre>
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