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allow json to have missing NVP #214

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allow json to have missing NVP #214

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14 changes: 12 additions & 2 deletions lager/extra/derive/cereal.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -25,8 +25,18 @@
cereal::make_nvp(BOOST_PP_STRINGIZE(elem__), x.elem__)

#define LAGER_DERIVE_IMPL_CEREAL_MEMBERS_NON_EMPTY__(r__, members__) \
ar(BOOST_PP_SEQ_FOR_EACH_I_R( \
r__, LAGER_DERIVE_IMPL_CEREAL_ITER__, _, members__));
try { \
ar(BOOST_PP_SEQ_FOR_EACH_I_R( \
r__, LAGER_DERIVE_IMPL_CEREAL_ITER__, *, members__)); \
} catch (const cereal::Exception&) { \
/* Default construct all members */ \
BOOST_PP_SEQ_FOR_EACH_R( \
r__, LAGER_DERIVE_IMPL_DEFAULT__, *, members__); \
}

// Helper macro to default construct each member
#define LAGER_DERIVE_IMPL_DEFAULT__(r__, data__, elem__) \
x.elem__ = decltype(x.elem__){};

#define LAGER_DERIVE_IMPL_CEREAL_MEMBERS_EMPTY__(r__, members__)

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