http://llvm.org/bugs/show_bug.cgi?id=22670
Bug ID: 22670
Summary: explicit specialization declarations don't work if
they appear after the template-id is mentioned
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Consider:
template<int> struct A {};
typedef A<1> A1;
template<> struct A<1>;
void f() { delete (A1*)0; }
template<> struct A<1> {};
Clang rejects this saying:
<stdin>:5:19: error: redefinition of 'A<1>'
template<> struct A<1> {};
^~~~
<stdin>:1:22: note: previous definition is here
template<int> struct A {};
^
But that's wrong: we should not have instantiated A<1> from the primary
template because we have a declaration of an explicit specialization for A<1>.
Instead, we should have treated the delete-expression as deleting an incomplete
type.
Creating the template-id A<1> should not cause the implicit instantiation of
A<1>, so we are not required to first declare the explicit specialization. And
even if we were incorrectly doing so, we should instead diagnose this as:
<stdin>:3:19: error: explicit specialization of 'A<1>' after instantiation
template<> struct A<1>;
^~~~
<stdin>:2:9: note: implicit instantiation first required here
typedef A<1> A1;
^
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