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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - constexpr function template specializations referenced from default initializers are not instantiated"
href="http://llvm.org/bugs/show_bug.cgi?id=16008">16008</a>
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<th>Summary</th>
<td>constexpr function template specializations referenced from default initializers are not instantiated
</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>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++11
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>richard-llvm@metafoo.co.uk
</td>
</tr>
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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>Example from DR1637:
struct A {
template <class T> constexpr void* f(T) { return nullptr; }
A* ap = (A*)f(A());
template <class ...T> constexpr A() {}
};
A *q = A().ap;
We do not instantiate a definition of A::f<A> here. Presumably this is because
we trigger the instantiation of the definition A::f<A> while parsing the
default initializer (before we've parsed the definition of A::f), and don't
make a note that we'll need to retry instantiation later if that instantiation
fails.
Reduced example:
template<typename T> constexpr int f(T);
int k = f(0);
template<typename T> constexpr int f(T) { return 0; }</pre>
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