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# addcbbarlog

Purpose
Declares a barrier log callback function, called at each iteration during the interior point algorithm.
Synopsis
`addcbbarlog(prob, cb, prio = 0)`
Arguments

prob | The problem pointer to which the callback is added.
cb | The callback function to add.
prio | The priority of the callback. If multiple callbacks are registered for the same event then they are invoked according to their priority ordering.

Return value
Always returns 0 (zero).
Further information
Note the general callback conventions:

- a callback function may return either an integer or a list.
- if the C callback function has an integer return type then the value returned to the optimizer is the integer value returned or the list's "ret" element (if it exists).
- if the C callback function has output arguments then these arguments are taken from the list that is returned by the callback function.
- the R callback function will only receive the input arguments of the C callback

The barlog callback supports the following input arguments (in this order):

cbprob
  The problem passed to the callback function, barlog.

The barlog callback supports the following output arguments:

ret
  An integer that will interrupt the search if non-zero.

Parent Topic R interface reference manual

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