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