PFNGLFLUSHMAPPEDNAMEDBUFFERRANGEEXTPROC typedef
        PFNGLFLUSHMAPPEDNAMEDBUFFERRANGEEXTPROC =
     Void Function(Uint32 buffer, Pointer<NativeType>  offset, Pointer<Uint32>  length)
    
    
    
Implementation
typedef PFNGLFLUSHMAPPEDNAMEDBUFFERRANGEEXTPROC =
    Void Function(
      Uint32 buffer,
      Pointer<NativeType> offset,
      Pointer<Uint32> length,
    );