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// PR c++/81957
// { dg-do compile { target c++11 } }
template <class T, T v>
struct integral_constant { };
struct f {
template<bool b, typename Int>
void operator()(integral_constant<bool,b>, Int i) {
}
};
template<bool...Bs, typename F, typename ...T>
auto dispatch(F f, T...t) -> decltype(f(integral_constant<bool,Bs>()..., t...)) {
return f(integral_constant<bool,Bs>()..., t...);
}
template<bool...Bs, typename F, typename ...T>
auto dispatch(F f, bool b, T...t) -> decltype(dispatch<Bs..., true>(f, t...)) {
if (b)
return dispatch<Bs..., true>(f, t...);
else
return dispatch<Bs..., false>(f, t...);
}
int main() {
dispatch(f(), true, 5);
}
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