# NAG Library Function Document

## 1Purpose

nag_opt_handle_free (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 #include
 void nag_opt_handle_free (void **handle, NagError *fail)

## 3Description

Each problem handle initialized by nag_opt_handle_init (e04rac) should be deallocated to avoid memory leaks. Therefore nag_opt_handle_free (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 initialized by nag_opt_handle_init (e04rac) might cause unpredictable behaviour, including a crash of your program. See nag_opt_handle_init (e04rac) for a generic description of the suite.

None.

## 5Arguments

1:    $\mathbf{handle}$void **Input/Output
On entry: the handle to the problem. It needs to be initialized by nag_opt_handle_init (e04rac) and must not be changed before the call to nag_opt_handle_free (e04rzc).
On exit: the handle is destroyed and set to $0$.
2:    $\mathbf{fail}$NagError *Input/Output
The NAG error argument (see Section 3.7 in How to Use the NAG Library and its Documentation).

## 6Error Indicators and Warnings

NE_ALLOC_FAIL
Dynamic memory allocation failed.
See Section 2.3.1.2 in How to Use the NAG Library and its Documentation 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 initialized by nag_opt_handle_init (e04rac) 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 2.7.6 in How to Use the NAG Library and its Documentation for further information.
NE_NO_LICENCE
Your licence key may have expired or may not have been installed correctly.
See Section 2.7.5 in How to Use the NAG Library and its Documentation for further information.

Not applicable.

## 8Parallelism and Performance

nag_opt_handle_free (e04rzc) is not threaded in any implementation.