http://llvm.org/bugs/show_bug.cgi?id=17537
Bug ID: 17537
Summary: Explicit specialization of deleted function template
not possible
Product: clang
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C++11
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
The following code fails to compile with clang r192096:
template <typename T>
void foo() = delete;
template <>
void foo<int>()
{
}
int main()
{
foo<int>();
}
This results in:
% ~/LLVM/build/Release+Asserts/bin/clang++ -std=c++11 clang.cpp
clang.cpp:5:6: error: redefinition of 'foo'
void foo<int>()
^
clang.cpp:5:6: note: previous definition is here
clang.cpp:11:5: error: no matching function for call to 'foo'
foo<int>();
^~~~~~~~
clang.cpp:2:6: note: candidate template ignored: substitution failure [with T =
int]
void foo() = delete;
^
2 errors generated.
According to ยง14.7.3p1 [temp.expl.spec], it should be allowed to delete a
function template while explicitly specializing it for a few types. This was
introduced by DR941:
| According to 14.7.3 [temp.expl.spec] paragraph 1, only non-deleted function
| templates may be explicitly specialized. There doesn't appear to be a
compelling
| need for this restriction, however, and it could be useful to forbid use of
| implicitly-instantiated specializations while still allowing use of
explicitly-
| specialized versions.
<http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#941>
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