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15 lines
480 B
15 lines
480 B
#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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#define nullopt experimental::nullopt |
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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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