On Wed, Jun 27, 2012 at 2:11 PM, Andrew E Slaughter
<[email protected]> wrote:
> If I understand correctly, if my initialization is expensive then it should
> be coded directly into the component member of a class derived from
> AnalyticFunction, as follows. Then simply use the project_solution and skip
> the add_initial_function(...) and init() commands for the system. Is this
> correct?
>
> class AnalyticFunctionTest : public AnalyticFunction<Number>{
> public:
> AnalyticFunctionTest(){
> _initialized = true;
> }
>
> Number component(unsigned int i, const Point& p, Real time = 0){
> if (i == 0){
> return 1;
> } else {
> return 2;
> }
> }
> };
>
> I tried using this, but I get an error b/c I believe that AnalyticFunction
> needs a default constructor
> (http://www.cplusplus.com/doc/tutorial/inheritance/), but it doesn't have
> one.
>
> example3b.cpp:41:25: error: no matching function for call to
> ‘libMesh::AnalyticFunction<double>::AnalyticFunction()’
>
> So, then how do you do what you propose?
I think you want to write a forwarding constructor for your class that
takes a pointer-to-function and constructs the parent by passing it
along:
class AnalyticFunctionTest : public AnalyticFunction<Number>{
public:
AnalyticFunctionTest(void fptr(DenseVector<Output>& output,
const Point& p,
const Real time))
: AnalyticFunction(fptr) // <-- construct the parent
{
_initialized = true;
}
--
John
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