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# problem.addSlpIterStartCallback

Purpose
Add a user callback to be called at the start of each SLP iteration
Topic areas
Callback, SLP
Synopsis
`problem.addSlpIterStartCallback(slpiterstart, data=None, priority=0)`
`slpiterstart(cbprob, cbdata)`
Arguments

slpiterstart | The function to be called at the start of each SLP iteration. slpiterstart returns an integer value. If the return value is nonzero, the SLP iterations will stop.
data: Any | A user-defined object, which can be used for any purpose by the function. data is passed to slpiterstart as cbdata.
priority: int | An integer that determines the order in which callbacks of this type will be invoked. The callback added with a higher priority will be called before a callback with a lower priority. Set to 0 if not required.
cbprob: problem | The problem passed to the callback function.
cbdata: Any | The user-defined object passed as data to problem.addSlpIterStartCallback.

Further information
This callback can be used at the start of each SLP iteration before the optimization begins.
Related topics
problem.addSlpIterEndCallback, problem.addSlpIterVarCallback problem.removeSlpIterStartCallback
Parent Topic Xpress problem object methods

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