compile tutorial with namespace

tutorial/305_QuadraticProgramming/main.cpp

@@ -14,7 +14,7 @@ Eigen::VectorXi b;
 Eigen::VectorXd B,bc,lx,ux,Beq,Bieq,Z;
 Eigen::SparseMatrix<double> Q,Aeq,Aieq;
 
-void solve(igl::Viewer &viewer)
+void solve(igl::viewer::Viewer &viewer)
 {
   using namespace std;
   igl::active_set_params as;
@@ -26,7 +26,7 @@ void solve(igl::Viewer &viewer)
   viewer.data.set_colors(C);
 }
 
-bool key_down(igl::Viewer &viewer, unsigned char key, int mod)
+bool key_down(igl::viewer::Viewer &viewer, unsigned char key, int mod)
 {
   switch(key)
   {
@@ -56,7 +56,7 @@ int main(int argc, char *argv[])
   igl::readOFF("../shared/cheburashka.off",V,F);
 
   // Plot the mesh
-  igl::Viewer viewer;
+  igl::viewer::Viewer viewer;
   viewer.data.set_mesh(V, F);
   viewer.core.show_lines = false;
   viewer.callback_key_down = &key_down;