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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - "friend Foo< args >;" sometimes gives friendship to other template instances"
href="https://bugs.llvm.org/show_bug.cgi?id=49472">49472</a>
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<th>Summary</th>
<td>"friend Foo< args >;" sometimes gives friendship to other template instances
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>jchl@arista.com
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>Given the following program [<a href="https://godbolt.org/z/c9Y895">https://godbolt.org/z/c9Y895</a>]:
#include <type_traits>
template< bool isFriend >
class Tester {
public:
template< typename T, typename = void >
struct IsAccessible : public std::false_type {};
template< typename T >
struct IsAccessible< T, decltype( std::declval< T >().f() ) > : public
std::true_type {};
};
class Foo {
friend Tester< true >;
void f() const;
};
static_assert( !Tester< false >::IsAccessible< Foo >::value );
static_assert( Tester< true >::IsAccessible< Foo >::value );
the first static_assert fails (with clang trunk), even though Tester< false >
isn't a friend of Foo, and therefore the partial specialization of IsAccessible
shouldn't be used for Tester< false >::IsAccessible< Foo >.
Note that this program works correctly in g++ (trunk), MSVC and ICC.</pre>
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