Initializing help system before first use

# problem.addPresolveCallback

Purpose
Declares a callback to be called after presolve has been performed.
Topic areas
Callback, Presolve
Synopsis
`problem.addPresolveCallback(presolve, data=None, priority=0)`
`presolve(cbprob, cbdata)`
Arguments

presolve | The callback function itself, which takes arguments cbprob and cbdata, and has no return value. This function is called after presolve is complete.
data: Any | A user-defined data to be passed to the callback function, presolve.
priority: int | An integer that determines the order in which multiple presolve callbacks 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 data passed as data when setting up the callback.

Related topics
problem.removePresolveCallback
Parent Topic Xpress problem object methods

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