Remove all explicitly typed for loops.

src/FlatLayerVisualisation.cpp

@@ -2,6 +2,7 @@
 #include <GL/gl.h>
 
 #include "FlatLayerVisualisation.hpp"
+#include "Range.hpp"
 
 using namespace std;
 using namespace fmri;
@@ -39,7 +40,7 @@ FlatLayerVisualisation::FlatLayerVisualisation(const LayerData &layer, Ordering
     auto scalingMax = max(abs(*minElem), abs(*maxElem));
 
     int v = 0;
-    for (int i = 0; i < limit; ++i) {
+    for (int i : Range(limit)) {
         setVertexPositions(i, vertexBuffer.get() + 12 * i);
         const int vertexBase = i * 4;
 

src/MultiImageVisualisation.cpp

@@ -1,6 +1,7 @@
 #include <glog/logging.h>
 #include "MultiImageVisualisation.hpp"
 #include "glutils.hpp"
+#include "Range.hpp"
 
 using namespace fmri;
 using namespace std;
@@ -28,7 +29,7 @@ MultiImageVisualisation::MultiImageVisualisation(const fmri::LayerData &layer)
 
     auto dataPtr = layer.data();
 
-    for (int i = 0; i < channels; ++i) {
+    for (auto i : Range(channels)) {
         textureReferences[i] = loadTexture(dataPtr, width, height);
         vertexBuffer[v++] = 0;
         vertexBuffer[v++] = 0 + 3 * r;

src/Range.hpp

@@ -2,6 +2,14 @@
 
 namespace fmri
 {
+
+    /**
+     * Iterable that produces a specific range of integers.
+     *
+     * Useful to make an automatically typed for loop over an unknown integer type.
+     *
+     * @tparam T The integer type to use.
+     */
     template<class T>
     class Range
     {
@@ -10,9 +18,20 @@ namespace fmri
         T end_;
 
     public:
-        explicit Range(const T &num) : start_(0), end_(num) {};
+        /**
+         * Construct a range from 0 to num, non inclusive.
+         *
+         * @param num
+         */
+        constexpr explicit Range(const T &num) : start_(0), end_(num) {};
 
-        Range(const T &start, const T &end) : start_(start), end_(end) {};
+        /**
+         * Construct a range from start to end, non inclusive.
+         *
+         * @param start
+         * @param end
+         */
+        constexpr Range(const T &start, const T &end) : start_(start), end_(end) {};
 
         class Iter
         {
@@ -20,18 +39,28 @@ namespace fmri
             T cur_;
 
         public:
-            explicit Iter(const T &cur) : cur_(cur)
+            constexpr explicit Iter(const T &cur) : cur_(cur)
             {};
 
-            bool operator!=(const Iter& o) { return o.cur_ != cur_; }
-            Iter&operator++() { ++cur_; return *this; }
+            typedef std::bidirectional_iterator_tag iterator_category;
+            typedef T value_type;
+            typedef typename std::make_signed<T>::type difference_type;
+            typedef T& reference;
+            typedef T* pointer;
 
-            T &operator*() { return cur_; }
+            constexpr bool operator!=(const Iter& o) { return o.cur_ != cur_; }
+            constexpr Iter&operator++() { ++cur_; return *this; }
+            constexpr Iter&operator--() { --cur_; return *this; }
+
+            constexpr const T &operator*() { return cur_; }
         };
 
         typedef Iter const_iterator;
+        typedef std::reverse_iterator<Iter> const_reverse_iterator;
 
-        const_iterator begin() const { return Iter(start_); }
-        const_iterator end() const { return Iter(end_); }
+        constexpr const_iterator begin() const { return Iter(start_); }
+        constexpr const_iterator end() const { return Iter(end_); }
+        constexpr const_reverse_iterator rbegin() const { return std::make_reverse_iterator(end()); }
+        constexpr const_reverse_iterator rend() const { return std::make_reverse_iterator(begin()); }
     };
 }

src/Simulator.cpp

@@ -9,6 +9,7 @@
 #include <opencv2/imgproc/imgproc.hpp>
 
 #include "Simulator.hpp"
+#include "Range.hpp"
 
 using namespace caffe;
 using namespace std;
@@ -78,7 +79,8 @@ void Simulator::Impl::loadMeans(const string &means_file)
 
     vector<cv::Mat> channels;
     float *data = mean_blob.mutable_cpu_data();
-    for (unsigned int i = 0; i < this->num_channels; ++i) {
+    for (auto i : Range(num_channels)) {
+        (void)i;// Suppress unused warning
         channels.emplace_back(mean_blob.height(), mean_blob.width(), CV_32FC1, data);
         data += mean_blob.height() * mean_blob.width();
     }
@@ -86,7 +88,7 @@ void Simulator::Impl::loadMeans(const string &means_file)
     cv::Mat mean;
     merge(channels, mean);
 
-    this->means = cv::Mat(this->input_geometry, mean.type(), cv::mean(mean));
+    this->means = cv::Mat(input_geometry, mean.type(), cv::mean(mean));
 }
 
 vector<LayerData> Simulator::Impl::simulate(const string& image_file)
@@ -107,7 +109,7 @@ vector<LayerData> Simulator::Impl::simulate(const string& image_file)
 	const auto& names = net.layer_names();
 	const auto& results = net.top_vecs();
 
-	for (unsigned int i = 0; i < names.size(); ++i) {
+	for (auto i : Range(names.size())) {
 		CHECK_EQ(results[i].size(), 1) << "Multiple outputs per layer are not supported!" << endl;
 		const auto blob = results[i][0];
 
@@ -126,7 +128,8 @@ vector<cv::Mat> Simulator::Impl::getWrappedInputLayer()
     const int height = input_geometry.height;
 
     DType* input_data = input_layer->mutable_cpu_data();
-    for (unsigned int i = 0; i < num_channels; i++) {
+    for (auto i : Range(num_channels)) {
+        (void)i;// Suppress unused warning
         channels.emplace_back(height, width, CV_32FC1, input_data);
         input_data += width * height;
     }
@@ -195,7 +198,9 @@ void Simulator::Impl::computeLayerInfo()
     const auto& names = net.layer_names();
     const auto& layers = net.layers();
 
-    for (auto i = 0u; i < names.size() && i < layers.size(); ++i) {
+    CHECK_EQ(names.size(), layers.size()) << "Size mismatch";
+
+    for (auto i : Range(names.size())) {
         auto& layer = layers[i];
         layerInfo_.emplace(names[i], LayerInfo(names[i], layer->type(), layer->blobs()));
     }

src/camera.cpp

@@ -43,7 +43,7 @@ static void move(unsigned char key)
         speed *= -1;
     }
 
-    for (unsigned int i = 0; i < 3; ++i) {
+    for (auto i = 0; i < 3; ++i) {
         camera.pos[i] += speed * dir[i];
     }
 }

src/main.cpp

@@ -13,6 +13,7 @@
 #include "LayerVisualisation.hpp"
 #include "FlatLayerVisualisation.hpp"
 #include "MultiImageVisualisation.hpp"
+#include "Range.hpp"
 
 using namespace std;
 using namespace fmri;
@@ -75,7 +76,7 @@ static void render()
     glPushMatrix();
     glTranslatef(5 * dataSet.size(), 0, 0);
 
-    for (unsigned int i = 0; i < dataSet.size(); ++i) {
+    for (auto i : Range(dataSet.size())) {
         glPushMatrix();
         renderLayerName(dataSet[i]);
         rendererData.layerVisualisations[i]->render();