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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - default member initializer for 'm' needed within definition of enclosing class for default argument of function"
href="https://bugs.llvm.org/show_bug.cgi?id=36684">36684</a>
</td>
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<tr>
<th>Summary</th>
<td>default member initializer for 'm' needed within definition of enclosing class for default argument of function
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>6.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jvapen@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=20047" name="attach_20047" title="Complete Reproduction">attachment 20047</a> <a href="attachment.cgi?id=20047&action=edit" title="Complete Reproduction">[details]</a></span>
Complete Reproduction
Following code compiles with MSVC 2015 and not with Clang-Cl:
run.bat
=======
cl.exe /EHsc t.cpp
llvm_6_0_0-RC3\bin\clang-cl.exe -fms-compatibility-version=19 /EHsc t.cpp
t.cpp
=====
#include <limits>
class A
{
public:
class B
{
public:
explicit B() = default;
~B() = default;
private:
double m = std::numeric_limits<double>::max();
};
void f(double d, const B &b = B{}) {}
};
int main()
{
A a{};
a.f(0.);
}
error
=====
t.cpp(15,34): error: default member initializer for 'm' needed within
definition of enclosing class 'A' outside of member functions
void f(double d, const B &b = B{}) {}
^
t.cpp(12,20): note: default member initializer declared here
double m = std::numeric_limits<double>::max();
^
1 error generated.</pre>
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