ByVal

```
@Documented
@Retention(RUNTIME)
@Target({METHOD,PARAMETER})
public @interface ByVal
```
Indicates that an argument gets passed or returned by value. When used alongside FunctionPointer, the Generator passes the underlying C++ function object (aka functor) instead of a function pointer.

See Also:

Generator

- Optional Element Summary
  
  Optional Elements
  Modifier and Type Optional Element Description
  
  java.lang.String nullValue
  A C++ expression to use when null is passed.

- Element Detail
  - nullValue
```
java.lang.String nullValue
```
    A C++ expression to use when null is passed. By default NullPointerException is thrown.
    
    Default:
    
    ""