Created
September 14, 2021 00:03
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gcc 5.5-friendly way of including optional
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| #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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