luau/tests/IostreamOptional.h

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// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
#pragma once
#include <ostream>
#include <optional>
namespace std
{
inline std::ostream& operator<<(std::ostream& lhs, const std::nullopt_t&)
{
return lhs << "none";
}
template<typename T>
auto operator<<(std::ostream& lhs, const std::optional<T>& t) -> decltype(lhs << *t) // SFINAE to only instantiate << for supported types
{
if (t)
return lhs << *t;
else
return lhs << "none";
}
} // namespace std