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Address a GCC parsing failure (compiler bug)

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* See https://travis-ci.org/Naios/continuable/jobs/348056527#L723
This commit is contained in:
Denis Blank 2018-03-02 02:51:53 +01:00
parent 83752502dc
commit 178f590aa9
1 changed files with 9 additions and 4 deletions
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13
include/continuable/detail/composition-all.hpp
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@ -85,10 +85,15 @@ constexpr auto deduce_from_pack(traits::identity<T>)
// We must guard the mapped type against to be void since this represents an
// empty signature hint.
template <typename Composition>
constexpr auto deduce_hint(Composition && /*composition*/)
-> decltype(deduce_from_pack(
traits::identity<decltype(map_pack(all_hint_deducer{},
std::declval<Composition>()))>{})){};
constexpr auto deduce_hint(Composition&& /*composition*/) {
// Don't change this way since it addresses a GCC compiler bug:
// error: extra ';' [-Werror=pedantic]
// std::declval<Composition>()))>{})){};
using mapped_t =
decltype(map_pack(all_hint_deducer{}, std::declval<Composition>()));
using deduced_t = decltype(deduce_from_pack(traits::identity<mapped_t>{}));
return deduced_t{};
}
/// Caches the partial results and invokes the callback when all results
/// are arrived. This class is thread safe.