fix _nana_std_optional
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549b3d4353
@ -17,7 +17,7 @@
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#include <nana/c++defines.hpp>
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#include <nana/c++defines.hpp>
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#ifdef _nana_std_optional
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#ifndef _nana_std_optional
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#include <optional>
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#include <optional>
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#else
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#else
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#include <stdexcept>
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#include <stdexcept>
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