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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Cannot pass exact expression of `__int128_t()` or `__uint128_t()` as template argument"
href="https://bugs.llvm.org/show_bug.cgi?id=46464">46464</a>
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<th>Summary</th>
<td>Cannot pass exact expression of `__int128_t()` or `__uint128_t()` as template argument
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</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>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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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>david@doublewise.net
</td>
</tr>
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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>In the following code, all lines are accepted except the two marked "fails".
The results are the same if `__int128_t` is replaced by `__uint128_t`. I would
expect this entire program to be valid.
```
constexpr auto x = __int128_t();
static_assert(__int128_t() == __int128_t(0), "");
int a[__int128_t()];
template<__int128_t>
void f() {
}
void g() {
f<__int128_t(0)>();
f<__int128_t() + __int128_t()>();
f<+__int128_t()>();
f<__int128_t()>(); // fails
using T = __int128_t;
f<T()>(); // fails
}
```
when compiled, outputs
```
<source>:13:5: error: no matching function for call to 'f'
f<__int128_t()>(); // fails
^~~~~~~~~~~~~~~
<source>:6:6: note: candidate template ignored: invalid explicitly-specified
argument for 1st template parameter
void f() {
^
<source>:15:5: error: no matching function for call to 'f'
f<T()>(); // fails
^~~~~~
<source>:6:6: note: candidate template ignored: invalid explicitly-specified
argument for 1st template parameter
void f() {
^
2 errors generated.
Compiler returned: 1
```</pre>
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