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# addcbintsol

Purpose
Declares a user integer solution callback function, called every time an integer solution is found by heuristics or during the Branch and Bound search.
Synopsis
`addcbintsol(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 intsol callback supports the following input arguments (in this order):

cbprob
  The problem passed to the callback function, intsol.

The intsol callback does not have any output arguments.
Parent Topic R interface reference manual

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