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Fix void_t for older compilers #25

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Fix void_t for older compilers #25

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5 changes: 4 additions & 1 deletion flat_hash_map.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -263,7 +263,10 @@ inline size_t next_power_of_two(size_t i)
return i;
}

template<typename...> using void_t = void;
// Implementation taken from http://en.cppreference.com/w/cpp/types/void_t
// (it takes CWG1558 into account and also works for older compilers)
template<typename... Ts> struct make_void { typedef void type;};
template<typename... Ts> using void_t = typename make_void<Ts...>::type;

template<typename T, typename = void>
struct HashPolicySelector
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