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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - false different type error message with templates and using"
href="http://llvm.org/bugs/show_bug.cgi?id=20340">20340</a>
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<th>Summary</th>
<td>false different type error message with templates and using
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>andrea.bressan@jku.at
</td>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=12782" name="attach_12782" title="test case">attachment 12782</a> <a href="attachment.cgi?id=12782&action=edit" title="test case">[details]</a></span>
test case
clang wrongly reports that the return type of the out-of-line definition of a
member function differs from the declared one.
I tested the attached test code with clang 3.3 and 5.0, g++, icc and vc++.
Only clang reports the following error:
not_same_return.cpp:32:41: error: out-of-line definition of 'Derived::f'
differs from the declaration in the return type
typename BaseClass<T>::Type Derived<T>::f ()
^
not_same_return.cpp:19:18: note: previous declaration is here
virtual Type f ();
^
1 error generated.
I triede the two following workarounds:
1: Changing
template <typename T>
typename BaseClass<T>::Type Derived<T>::f (){...}
to
template <typename T>
typename Derived<T>::Type Derived<T>::f (){...}
makes compilation with clang succeed and that with g++ fail.
2: Replacing
using BaseClass<T>::Type;
with
typedef BaseClass<T>::Type Type;
in the derived class makes both clang and g++ compile
(I cannot test with icc and vc++ at the moment)</pre>
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