Fix. Remove unused variable, use size_t counter.

dune/solvers/test/projectedgradienttest.cc

@@ -21,8 +21,8 @@
 #include <dune/solvers/iterationsteps/projectedgradientstep.hh>
 #include <dune/solvers/test/common.hh>
 
-template<class GridType, class MatrixType, class VectorType, class BitVector>
-bool solveObstacleProblemByProjectedGradientSolver(const GridType& grid, const MatrixType& mat, VectorType& x, const VectorType& rhs, const BitVector& ignore, int maxIterations=10000, double tolerance=1.0e-10)
+template<class MatrixType, class VectorType, class BitVector>
+bool solveObstacleProblemByProjectedGradientSolver(const MatrixType& mat, VectorType& x, const VectorType& rhs, const BitVector& ignore, int maxIterations=10000, double tolerance=1.0e-10)
 {
     // create double obstacle constraints
     const int blockSize = VectorType::block_type::dimension;
@@ -31,7 +31,7 @@ bool solveObstacleProblemByProjectedGradientSolver(const GridType& grid, const M
     BoxConstraintVector boxConstraints(rhs.size());
     for (size_t i = 0; i < boxConstraints.size(); ++i)
     {
-        for (int j = 0; j < blockSize; ++j)
+        for (size_t j = 0; j < blockSize; ++j)
         {
             boxConstraints[i].lower(j) = (ignore[i][j]==true) ? 0 : -1;
             boxConstraints[i].upper(j) = (ignore[i][j]==true) ? 0 : 1;
@@ -97,7 +97,7 @@ bool checkWithGrid(const GridType& grid, const std::string fileName, int maxIter
     markBoundaryDOFs(gridView, ignore);
 
 
-    solveObstacleProblemByProjectedGradientSolver(grid, A, u, rhs, ignore, maxIterations);
+    solveObstacleProblemByProjectedGradientSolver(A, u, rhs, ignore, maxIterations);
 
     if (fileName!="")
     {