[Solved] How to replace std::is_same_v with std::is_same

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The error got resolved by @Someprogrammerdude comment about a is_same_v helper variable template defined here. My final code is

#ifdef My_OLD_TOOL_CHAIN

template< class T, class U >
inline constexpr bool is_same_v = std::is_same<T, U>::value;

template<class T, class O = T>
using IteratorOnly = std::enable_if_t<
    !is_same_v<typename std::iterator_traits<T>::value_type, void>, O
>;

#else // My_OLD_TOOL_CHAIN

template<class T, class O = T>
using IteratorOnly = std::enable_if_t<
    !std::is_same_v<typename std::iterator_traits<T>::value_type, void>, O
>;

#endif // My_OLD_TOOL_CHAIN

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solved How to replace std::is_same_v with std::is_same