make combo_iterator more std::iterator-y

vis/include/combo_iterator.hpp

@@ -6,6 +6,13 @@
 
 template<class T>
 struct ComboIterator {
+    typedef ComboIterator<T> self_type;
+    typedef const std::vector<T> value_type;;
+    typedef const std::vector<T> *pointer;
+    typedef const std::vector<T> &reference;
+    typedef size_t difference_type;
+    typedef std::forward_iterator_tag iterator_category;
+
     const std::vector<T> &vals;
     const size_t k;
     size_t n;
@@ -23,28 +30,43 @@ struct ComboIterator {
         set_curr();
     }
 
+    ~ComboIterator() = default;
+
     void set_curr() {
         for (size_t i = 0, j = 0; i < vals.size(); ++i) {
             if (bits[i]) curr[j++] = vals[i];
         }
     }
 
-    const std::vector<T> &operator*() const {
-        return curr;
-    }
-
-    void operator++() {
-        std::next_permutation(bits.begin(), bits.end());
-        set_curr();
-        ++n;
+    [[nodiscard]] bool operator==(const ComboIterator<T> &o) const {
+        return n == o.n;
     }
 
     [[nodiscard]] bool operator!=(const ComboIterator<T> &o) const {
         return n != o.n;
     }
 
-    [[nodiscard]] bool operator==(const ComboIterator<T> &o) const {
-        return n == o.n;
+    reference operator*() const {
+        return curr;
+    }
+
+    pointer operator->() const {
+        return &curr;
+    }
+
+    self_type operator++(int) {
+        std::next_permutation(bits.begin(), bits.end());
+        set_curr();
+        ++n;
+        return *this;
+    }
+
+    self_type operator++() {
+        self_type r = *this;
+        std::next_permutation(bits.begin(), bits.end());
+        set_curr();
+        ++n;
+        return r;
     }
 };
 

vis/src/main.cpp

@@ -113,8 +113,16 @@ int main(int argc, char *argv[]) {
     std::vector<GLuint> ibos;
     std::vector<unsigned> counts;
 
-    for (auto sg_gens : Combos(g_gens, 3)) {
-        const std::vector<int> data = gg.tile(g_gens, sg_gens, gg.triangulate(sg_gens)).vals;
+    auto combos = Combos(g_gens, 3);
+    std::vector<std::vector<int>> chosen = {
+        {1, 2, 3},
+        {0, 2, 3},
+    };
+//    chosen = std::vector<std::vector<int>>(combos.begin(), combos.end());
+
+    for (auto sg_gens : chosen) {
+        auto s = gg.tile(g_gens, sg_gens, gg.triangulate(sg_gens));
+        const std::vector<int> data = s.vals;
 
         GLuint vao = utilCreateVertexArray();
         GLuint ibo = utilCreateBuffer();
@@ -162,9 +170,11 @@ int main(int argc, char *argv[]) {
 
         for (int i = 0; i < vaos.size(); ++i) {
             auto c = glm::mix(
-                glm::vec3(.3, .2, .5),
-                glm::vec3(.9, .9, .95),
-                (float) (i + 1) / vaos.size()
+                glm::vec3(1,0,0),
+                glm::vec3(.2,.2,.3),
+//                glm::vec3(.3, .2, .5),
+//                glm::vec3(.9, .9, .95),
+                (float) (i) / (vaos.size()-1.f)
             );
 
             glBindProgramPipeline(pipe);