# NAG CL Interfacee04rzc (handle_​free)

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## 1Purpose

e04rzc is a part of the NAG optimization modelling suite. It is used to deallocate the memory used within the problem handle and to destroy the handle itself.

## 2Specification

 #include
 void e04rzc (void **handle, NagError *fail)
The function may be called by the names: e04rzc or nag_opt_handle_free.

## 3Description

Each initialized problem handle (e.g., by e04rac) should be deallocated to avoid memory leaks. Therefore, e04rzc should be called on all the handles which are no longer needed, typically after obtaining results from the solver. Please note that passing a handle which has not been properly initialized might cause unpredictable behaviour, including a crash of your program. See Section 4.1 in the E04 Chapter Introduction for more details about the NAG optimization modelling suite.

None.

## 5Arguments

1: $\mathbf{handle}$void ** Input/Output
On entry: the handle to the problem. It needs to be initialized (e.g., by e04rac) and must not be changed between calls to the NAG optimization modelling suite.
On exit: the handle is destroyed and set to NULL.
2: $\mathbf{fail}$NagError * Input/Output
The NAG error argument (see Section 7 in the Introduction to the NAG Library CL Interface).

## 6Error Indicators and Warnings

NE_ALLOC_FAIL
Dynamic memory allocation failed.
See Section 3.1.2 in the Introduction to the NAG Library CL Interface for further information.
On entry, argument $⟨\mathit{\text{value}}⟩$ had an illegal value.
NE_HANDLE
The supplied handle does not define a valid handle to the data structure for the NAG optimization modelling suite. It has not been properly initialized or it has been corrupted.
NE_INTERNAL_ERROR
An internal error has occurred in this function. Check the function call and any array sizes. If the call is correct then please contact NAG for assistance.
See Section 7.5 in the Introduction to the NAG Library CL Interface for further information.
NE_NO_LICENCE
Your licence key may have expired or may not have been installed correctly.
See Section 8 in the Introduction to the NAG Library CL Interface for further information.

Not applicable.

## 8Parallelism and Performance

Background information to multithreading can be found in the Multithreading documentation.
e04rzc is not threaded in any implementation.