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  • Dmitri Naumov's avatar
    065d256b
    [MeL] Return PropertyVector* instead of opt refs. · 065d256b
    Dmitri Naumov authored 
    Since boost-1.61 (and also not in the std::optional)
optionals holding references do have some restrictions
and are difficult to use. In this special case
optional<PropertyVector&> is equivalent semantically
to a PropertyVector*. The pointer indicates that it is
not owning (contrary to usage of unique_ptr).

Thanks to Christoph pointing this issue out.
    065d256b
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    [MeL] Return PropertyVector* instead of opt refs.
    Dmitri Naumov authored 
    Since boost-1.61 (and also not in the std::optional)
optionals holding references do have some restrictions
and are difficult to use. In this special case
optional<PropertyVector&> is equivalent semantically
to a PropertyVector*. The pointer indicates that it is
not owning (contrary to usage of unique_ptr).

Thanks to Christoph pointing this issue out.
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