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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Unambiguous use of operator==considered ambiguous."
href="https://bugs.llvm.org/show_bug.cgi?id=51887">51887</a>
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<th>Summary</th>
<td>Unambiguous use of operator==considered ambiguous.
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>12.0
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
</td>
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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>qtom.boehmer@googlemail.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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<p>
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<pre>The following compiles fine with gcc, but with clang gives the error: "use of
overloaded operator '==' is ambiguous".
----------------------------------------------------
#include <cassert>
template<typename T>
bool operator==(T const&, T const&)
{
return false;
}
template<int I>
struct S
{
template<int J>
constexpr
bool operator==(S<J> const&) const
{
return true;
}
};
int main()
{
auto i = S<0>{};
auto j = S<0>{};
assert(i == j);
}
----------------------------------------------------</pre>
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