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replace is_callable_v workaround with is_invocable_v; fixes build on clang12 #210

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replace is_callable_v workaround with is_invocable_v; fixes build on clang12 #210

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10 changes: 2 additions & 8 deletions include/eosio/vm/function_traits.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -72,12 +72,6 @@ namespace eosio { namespace vm {
inline constexpr U&& make_dependent(U&& u) { return static_cast<U&&>(u); }
}

template <auto FN>
inline constexpr static bool is_callable_v = EOS_VM_HAS_MEMBER(AUTO_PARAM_WORKAROUND(FN), operator());

template <typename F>
constexpr bool is_callable(F&& fn) { return EOS_VM_HAS_MEMBER(fn, operator()); }

namespace detail {
template <bool Decay, typename R, typename... Args>
constexpr auto get_types(R(Args...)) -> std::tuple<R, freestanding,
Expand All @@ -102,7 +96,7 @@ namespace eosio { namespace vm {
std::tuple<std::conditional_t<Decay, std::decay_t<Args>, Args>...>>;
template <bool Decay, typename F>
constexpr auto get_types(F&& fn) {
if constexpr (is_callable_v<decltype(fn)>)
if constexpr (std::is_invocable_v<decltype(fn)>)
return get_types<Decay>(&F::operator());
else
return get_types<Decay>(fn);
Expand Down Expand Up @@ -144,7 +138,7 @@ namespace eosio { namespace vm {
constexpr auto parameters_from_impl(R(Cls::*)(Args...)const &&) -> pack_from_t<N, Args...>;
template <std::size_t N, typename F>
constexpr auto parameters_from_impl(F&& fn) {
if constexpr (is_callable_v<decltype(fn)>)
if constexpr (std::is_invocable_v<decltype(fn)>)
return parameters_from_impl<N>(&F::operator());
else
return parameters_from_impl<N>(fn);
Expand Down