Nico Lomuto would be proud... if he didn't hate that algo so much

include/gp/algorithms/partition.hpp

@@ -4,18 +4,17 @@
 namespace gp {
     template<typename it_t, typename pred>
     it_t lomuto_partition(it_t first, it_t last, pred predicate = pred{}) {
-        auto i = o">--it_t(first);
+        auto i = it_t(first);
         
         auto j = first;
-        ++j;
         for(; j != last; ++j) {
             if(predicate(*j)){
-                ++i;
                 gp::swap(*i, *j);
+                ++i;
             }
         }
 
-        return o">++i;
+        return i;
     }
 
     template<typename it_t, typename pred>

tests/dynarray_test.cpp

@@ -60,4 +60,50 @@ struct dynarray_test : public test_scaffold {
 	}
 };
 
-append_test dummy_afdglys543(new dynarray_test{});
+append_test dummy_afdglys543(new dynarray_test{});
+
+struct dynarray2_test : public test_scaffold {
+	uint32_t seed;
+
+	dynarray2_test() {
+		name = __FILE__ ":2_seed";
+		seed = std::random_device{}();
+		name += std::to_string(seed);
+	}
+
+	virtual int run() {
+        using val = gp::dynarray<int, 100>;
+		cheap_rand setter(seed);
+        
+        std::unique_ptr<gp::array<char, 4096*4096>> store = std::make_unique<gp::array<char, 4096*4096>>();
+        gp::buddy alloc{&*store->begin(), store->size()};
+
+        gp::vector<val> vals{alloc};
+        std::uniform_int_distribution<int> dist(0,49);
+        std::uniform_int_distribution<int> coin(false,true);
+        bool happened = false;
+        for(int i = 0; i < 1000; i++) {
+            val a;
+            if(coin(setter)) {
+                a.emplace_back(dist(setter));
+            }
+            a.emplace_back(dist(setter));
+            for(int j = 0; j < 1000; j++) {
+                val b;
+                if(coin(setter)) {
+                    b.emplace_back(dist(setter));
+                }
+                b.emplace_back(dist(setter));
+                if(a == b) {
+                    if(! (a != b)) {
+                        happened = true;
+                    }
+                }
+            }
+        }
+
+		return !happened;
+	}
+};
+
+append_test dummy_5dfqlys543(new dynarray2_test{});