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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Strange compiler error about the subsequent template parameter when a std::size_t template parameter becomes negative"
href="https://bugs.llvm.org/show_bug.cgi?id=35866">35866</a>
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<th>Summary</th>
<td>Strange compiler error about the subsequent template parameter when a std::size_t template parameter becomes negative
</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>MacOS X
</td>
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<th>Status</th>
<td>NEW
</td>
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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++11
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>xaxxon@gmail.com
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
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<pre>Strange compiler error about the subsequent template parameter when a
std::size_t template parameter becomes negative
<a href="https://godbolt.org/g/TJRJYK">https://godbolt.org/g/TJRJYK</a>
#include <type_traits>
#include <tuple>
struct C2 {
template<int default_arg_position = -1, class DefaultArgsTuple =
std::tuple<>>
int operator()(){return 5;}
};
template<class... Ts>
void stuff(Ts&&...) {}
struct C1 {
template<std::size_t... ArgIndexes>
void operator()() {
constexpr int i = 1; // <=== THIS LINE
// constexpr int i = 0; // works OK
stuff(
C2{}.operator()<ArgIndexes - i>()...
);
}
};
int main() {
C1{}.operator()<0>();
}</pre>
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