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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - use of overloaded operator '[]' is ambiguous (with template conversion operator)"
href="https://bugs.llvm.org/show_bug.cgi?id=40610">40610</a>
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<th>Summary</th>
<td>use of overloaded operator '[]' is ambiguous (with template conversion operator)
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</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
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>chabster@gmail.com
</td>
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>#include <type_traits>
struct abc
{
operator bool *() { return {}; }
template <typename T> operator T *() { return {}; }
//template <typename T, typename U = std::enable_if_t<std::is_same_v<T,
std::remove_cv_t<T>>> > operator T *() = delete;
};
int main() {
abc{}[0];
return 0;
}
#1 with x86-64 clang 7.0.0
<source>:11:10: error: use of overloaded operator '[]' is ambiguous (with
operand types 'abc' and 'int')
abc{}[0];
~~~~~^~
<source>:11:10: note: built-in candidate operator[](_Bool *, long)
<source>:11:10: note: built-in candidate operator[](const _Bool *, long)
<source>:11:10: note: built-in candidate operator[](volatile _Bool *, long)
<source>:11:10: note: built-in candidate operator[](const volatile _Bool *,
long)
If second template is used instead - it compiles just fine.
GCC, MSVC and ICC all are happy with this code.</pre>
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