Using Callbacks

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This chapter introduces callbacks. Callbacks allow you to monitor closely and to guide the behavior of ILOG CPLEX optimizers. In particular, ILOG CPLEX callbacks allow user code to be executed regularly during an optimization. To use callbacks with ILOG CPLEX, you must first write the callback function, and then pass it to ILOG CPLEX. There are two types of callbacks: diagnostic callbacks and control callbacks. You will find additional information about callbacks in this manual in Advanced MIP Control Interface. This chapter includes information about:

• Diagnostic Callbacks
• Implementing Callbacks in ILOG CPLEX with Concert Technology
• Example: Deriving the Simplex Callback ilolpex4.cpp
• Implementing Callbacks in the Callable Library
• Interaction Between Callbacks and ILOG CPLEX Parallel Optimizers
• Example: Using Callbacks lpex4.c
• Control Callbacks for IloCplex
• Example: Controlling Cuts iloadmipex5.cpp