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Brief absl::optional description
#if __cplusplus >= 201703 && __has_include(<optional>)
#include <optional>
namespace absl {
using std::bad_optional_access;
using std::optional;
using std::make_optional;
using std::nullopt_t;
using std::nullopt;
} // namespace absl
#else // __cplusplus >= 201703 && __has_include(<optional>)
// Internal abseil implementation.
// Under define not to generate more code to a compiler because std::optional
// and absl::optional claim to be compatible.
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