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Workaround for gcc < 5 #33

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Workaround for gcc < 5 #33

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11 changes: 11 additions & 0 deletions flat_hash_map.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -263,7 +263,18 @@ inline size_t next_power_of_two(size_t i)
return i;
}

/* Workaround from https://stackoverflow.com/questions/53469491/stdhash-no-type-named-hash-policy-when-running-skaflat-hash-map
This case was underspecified and fixed in http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1558.
This only affects gcc with major version < 5
*/
#if defined(__GNUC__) && !defined(__clang__)
# if __GNUC__ >= 5
template<typename...> using void_t = void;
# else
template <typename...> struct voider { using type = void; };
template <typename... Ts> using void_t = typename voider<Ts...>::type;
# endif
#endif

template<typename T, typename = void>
struct HashPolicySelector
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