Use unsigned types for non-negative integers

src/bisection-simpler-example2-gradient.cc

@@ -45,7 +45,7 @@ class SampleFunctional : public SmallFunctional<dimension> {
     return d(x) * dir;
   }
 
-  SmallVector minimise(const SmallVector x, int iterations) const {
+  SmallVector minimise(const SmallVector x, unsigned int iterations) const {
     SmallVector descDir = d(x);
     descDir *= -1; // The negative gradient
 
@@ -80,7 +80,7 @@ class SampleFunctional : public SmallFunctional<dimension> {
 
     double m = l / 2 + r / 2;
     SmallVector middle;
-    for (size_t count = 0; count < iterations; ++count) {
+    for (unsigned int count = 0; count < iterations; ++count) {
       Dune::dverb << "now at m = " << m << std::endl;
       Dune::dverb << "Value of J here: " << operator()(x + middle) << std::endl;