How to define a C++ function in VTK - c++

Question

I'm new with C++ and VTK. I'm trying to get cells ID into a rectilinearGrid basic example. I'm using this code, but the compiler say that is wrong with the error that I wrote in comment
#include <vtkActor.h>
#include <vtkCamera.h>
#include <vtkFloatArray.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRectilinearGrid.h>
#include <vtkRectilinearGridGeometryFilter.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <array>
int main()
{
vtkNew<vtkNamedColors> colors;
std::array<int, 16> x = {
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}};
std::array<int, 16> y = {
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}};
std::array<int, 16> z = {
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}};
// Create a rectilinear grid by defining three arrays specifying the
// coordinates in the x-y-z directions.
vtkNew<vtkFloatArray> xCoords;
for (auto&& i : x)
{
xCoords->InsertNextValue(i);
}
vtkNew<vtkFloatArray> yCoords;
for (auto&& i : y)
{
yCoords->InsertNextValue(i);
}
vtkNew<vtkFloatArray> zCoords;
for (auto&& i : z)
{
zCoords->InsertNextValue(i);
}
// The coordinates are assigned to the rectilinear grid. Make sure that
// the number of values in each of the XCoordinates, YCoordinates,
// and ZCoordinates is equal to what is defined in SetDimensions().
//
vtkNew<vtkRectilinearGrid> rgrid;
rgrid->SetDimensions(int(x.size()), int(y.size()), int(z.size()));
rgrid->SetXCoordinates(xCoords);
rgrid->SetYCoordinates(yCoords);
rgrid->SetZCoordinates(zCoords);
vtkCell* GetCell(vtkRectilinearGrid * rgrid, int i, int j, int k) //I SHOULD INSERT IN HERE ";" FOR
{ //CLOSING THE STATEMENT. BUT IN
int dims[3]; //THIS WAY THE FUNCTION PARAMETER
rgrid->GetDimensions(dims); // BEHIND WOULDN'T BE CONNECTED.
if (i < 0 || i > dims[0] - 1 ||
j < 0 || j > dims[1] - 1 ||
k < 0 || k > dims[2] - 1)
{
return NULL; // out of bounds!
}
int pos[3];
pos[0] = i;
pos[1] = j;
pos[2] = k;
vtkIdType id;
id = vtkStructuredData::ComputeCellId(dims, pos);
return rgrid->GetCell(id);
};
// Extract a plane from the grid to see what we've got.
vtkNew<vtkRectilinearGridGeometryFilter> plane;
plane->SetInputData(rgrid);
plane->SetExtent(0, 46, 16, 16, 0, 43);
vtkNew<vtkPolyDataMapper> rgridMapper;
rgridMapper->SetInputConnection(plane->GetOutputPort());
vtkNew<vtkActor> wireActor;
wireActor->SetMapper(rgridMapper);
wireActor->GetProperty()->SetRepresentationToWireframe();
wireActor->GetProperty()->SetColor(colors->GetColor3d("Black").GetData());
// Create the usual rendering stuff.
vtkNew<vtkRenderer> renderer;
vtkNew<vtkRenderWindow> renWin;
renWin->AddRenderer(renderer);
vtkNew<vtkRenderWindowInteractor> iren;
iren->SetRenderWindow(renWin);
renderer->AddActor(wireActor);
renderer->SetBackground(1, 1, 1);
renderer->ResetCamera();
renderer->GetActiveCamera()->Elevation(30.0);
renderer->GetActiveCamera()->Azimuth(15.0);
renderer->GetActiveCamera()->Zoom(1.0);
renderer->SetBackground(colors->GetColor3d("Beige").GetData());
renWin->SetSize(600, 600);
// interact with data
renWin->Render();
iren->Start();
return EXIT_SUCCESS;
}
How could be fixed?
UPDATE 1: I have inserted an image of the compiling error. Should be inserted ";" for closing the statement before {}
UPDATE 2: the exact error is
Errore (attivo) E0065 expected ';' RGrid C:\vtk\VTK-8.2.0\Examples\DataManipulation\Cxx\RGrid.cxx 73
I'm using Visual Studio. I have tried to drop the last ";" but nothing change
UPDATE 3: I have uploaded all the code

Answer 1

You have defined your GetCell function inside the body of the main function, which is not allowed in C++. Only a declaration would be allowed inside the body, hence the compiler expects a semicolon after the function header.
Move the whole GetCell function block outside the main function. If that leads to problems you cannot solve ask another question about them.