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Import nan from global namespace when < C++11.
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json_pack_base.h

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@@ -20,6 +20,14 @@
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#include <map>
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#include <cmath>
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#if defined(__cplusplus) && __cplusplus<201103L
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#include <math.h>
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namespace std
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{
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using ::nan;
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}
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#endif
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namespace classdesc
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{
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