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15 lines
427 B
15 lines
427 B
5 years ago
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#pragma once
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#ifdef __has_include
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#if defined(__cplusplus) && __cplusplus >= 201606L && __has_include(<optional>)
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#include <optional> // IWYU pragma: export
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#elif __has_include(<experimental/optional>)
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#include <experimental/optional> // IWYU pragma: export
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#define optional experimental::optional
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#else
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#error "Missing support for <optional> or <experimental/optional>"
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#endif
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#else
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#error "__has_include unavailable"
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#endif
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