https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86859
Baptiste Parsy <baptiste.parsy at epita dot fr> changed:
What |Removed |Added
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CC| |baptiste.parsy at epita dot fr
--- Comment #1 from Baptiste Parsy <baptiste.parsy at epita dot fr> ---
I get a similar issue.
The following code compiles with clang 9.0.1 but fails with gcc 9.3.0:
#include <functional>
#include <iostream>
template<class, class = std::void_t<> >
struct needs_unapply : std::true_type {
};
template<class T>
struct needs_unapply<T, std::void_t<decltype(std::declval<T>()())>> :
std::false_type {
};
template<typename F>
auto curry(F&& f) {
if constexpr (needs_unapply<decltype(f)>::value) {
return [=](auto&& ...x) {
return curry(
[=](auto&& ...xs) -> decltype(f(x..., xs...)) {
return f(x..., xs...);
}
);
};
} else {
return f();
}
}
int main() {
auto f = [](auto a, auto b, auto c, auto d, auto e) {
return a * b * c * d * e;
};
std::cout << curry(f)(1, 2)(3)(4, 5);
}
