Null()` checks
and function pointer opaque getter and setter as `long` types.
#### Example
Assume the following C Header file example:
```
typedef struct {
int32_t balance;
} T2_UserData;
typedef int32_t ( * T2_CustomFuncA)(void* aptr);
typedef int32_t ( * T2_CustomFuncB)(T2_UserData* pUserData);
typedef struct {
T2_CustomFuncA CustomFuncA1;
T2_CustomFuncB CustomFuncB1;
} T2_InitializeOptions;
```
and the following GlueGen *no-magic* configuration
```
Opaque long void*
EmitStruct T2_UserData
StructPackage T2_UserData com.jogamp.gluegen.test.junit.generation
EmitStruct T2_InitializeOptions
StructPackage T2_InitializeOptions com.jogamp.gluegen.test.junit.generation
```
This will lead to the following result for `T2_InitializeOptions.customFuncA1`
```
/** Interface to C language function:
int32_t CustomFuncA1(void * aptr)
*/
public final int CustomFuncA1(long aptr) { ... }
/**
* Returns `true` if native pointer CustomFuncA1 is `null`, otherwise `false`.
*
* Corresponds to native field CustomFuncA1, being a struct owned function pointer.
*
*
* Native Field Signature (PointerType) typedef 'T2_CustomFuncA' -> int32_t (*)(void * aptr), size [fixed false, lnx64 8], const[false], pointer*1, funcPointer
*
*/
public final boolean isCustomFuncA1Null() { .. }
/**
* Setter for native field CustomFuncA1, being a struct owned function pointer.
*
* Native Field Signature (PointerType) typedef 'T2_CustomFuncA' -> int32_t (*)(void * aptr), size [fixed false, lnx64 8], const[false], pointer*1, funcPointer
*
*/
public final T2_InitializeOptions setCustomFuncA1(long src) { .. }
/**
* Getter for native field CustomFuncA1, being a struct owned function pointer.
*
* Native Field Signature (PointerType) typedef 'T2_CustomFuncA' -> int32_t (*)(void * aptr), size [fixed false, lnx64 8], const[false], pointer*1, funcPointer
*
*/
public final long getCustomFuncA1() { .. }
```
and similar to `T2_InitializeOptions.customFuncB1`
```
/** Interface to C language function:
int32_t CustomFuncB1(T2_UserData * pUserData)
*/
public final int CustomFuncB1(T2_UserData pUserData) { .. }
/**
* Returns `true` if native pointer CustomFuncB1 is `null`, otherwise `false`.
*
* Corresponds to native field CustomFuncB1, being a struct owned function pointer.
*
*
* Native Field Signature (PointerType) typedef 'T2_CustomFuncB' -> int32_t (*)(T2_UserData * pUserData), size [fixed false, lnx64 8], const[false], pointer*1, funcPointer
*
*/
public final boolean isCustomFuncB1Null() { .. }
/**
* Setter for native field CustomFuncB1, being a struct owned function pointer.
*
* Native Field Signature (PointerType) typedef 'T2_CustomFuncB' -> int32_t (*)(T2_UserData * pUserData), size [fixed false, lnx64 8], const[false], pointer*1, funcPointer
*
*/
public final T2_InitializeOptions setCustomFuncB1(long src) { .. }
/**
* Getter for native field CustomFuncB1, being a struct owned function pointer.
*
* Native Field Signature (PointerType) typedef 'T2_CustomFuncB' -> int32_t (*)(T2_UserData * pUserData), size [fixed false, lnx64 8], const[false], pointer*1, funcPointer
*
*/
public final long getCustomFuncB1() { .. }
```
## Platform Header Files
GlueGen provides convenient platform headers,
which can be included in your C header files for native compilation and GlueGen code generation.
Example:
```
#include
#include
uint64_t test64;
size_t size1;
ptrdiff_t ptr1;
```
To compile this file you have to include the following folder to your compilers system includes, ie `-I`:
```
gluegen/make/stub_includes/platform
```
To generate code for this file you have to include the following folder to your GlueGen `includeRefid` element:
```
gluegen/make/stub_includes/gluegen
```
## Pre-Defined Macros
To identity a GlueGen code generation run, GlueGen defines the following macros:
```
#define __GLUEGEN__ 2
```