separate vao for each kind of slice

examples/CMakeLists.txt

@@ -4,3 +4,5 @@ target_link_libraries(memo PRIVATE tc vis-util)
 add_executable(geom geomtest.cpp)
 target_link_libraries(geom PRIVATE tc vis-util)
 
+add_executable(sub subtest.cpp)
+target_link_libraries(sub PRIVATE vis-util)

examples/subtest.cpp

@@ -0,0 +1,24 @@
+#include <iostream>
+#include <vector>
+
+#include <combo_iterator.hpp>
+#include <numeric>
+
+template<class T>
+std::ostream &operator<<(std::ostream &o, const std::vector<T> &v) {
+    for (const auto &e : v) o << e << " ";
+    return o;
+}
+
+int main() {
+    std::vector<int> gens(5);
+    std::iota(gens.begin(), gens.end(), 0);
+
+    const Combos<int> &combos = Combos(gens, 2);
+
+    for (const auto &e : combos) {
+        std::cout << e << std::endl;
+    }
+
+    return EXIT_SUCCESS;
+}