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ckerr/gist:b5313021e52b3060f8b678152f177095

Created September 14, 2021 00:03
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gcc 5.5-friendly way of including optional
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gistfile1.txt
#if !defined(__has_include) || __has_include(<optional>)
#include <optional>
#elif __has_include(<experimental/optional>)
#include <experimental/optional>
namespace std { template<typename T> using optional = experimental::optional<T>; }
#endif
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