core: Relax lifetime constraint on msgs
in I2CTransfer::transfer()
#89
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This change enables users of
i2cdev
to create generic functions onT: I2CTransfer
that have output buffers constructed separately from theI2CMessage
array, like the following:Before this,
messages
would not satisfy the constraints of.transfer()
, becausemessages
does not live as long as one of the output buffersout
:The error message is a little confusing, but basically
&'a mut [Self::Message]
is forcing the array ofI2CMessage
s to match the lifetime of the buffers in the messages, which is not strictly necessary: the array of messages can have a different lifetime than the buffers. After this change, the above example compiles successfully.