some more fixes

Author: Enchufa2

.gitignore

@@ -6,3 +6,4 @@
 inst/doc
 docs
 __pycache__
+smoke_test*

src/multiset.h

@@ -42,9 +42,12 @@ class MultisetPartitions {
 
     explicit operator bool() const { return !done; }
     value_type operator*() { return get(); }
-    pointer operator->() const { return &get(); }
 
-    iterator& operator++() { done = next(); return *this; }
+    iterator& operator++() {
+      done = next();
+      Rcpp::checkUserInterrupt();
+      return *this;
+    }
     iterator operator++(int) { auto it = *this; ++*this; return it; }
 
     friend bool operator==(const iterator& lhs, const iterator& rhs) {
@@ -139,14 +142,13 @@ class MultisetPartitions {
 
     value_type get() {
       value_type partition;
+      partition.reserve(l + 1);
       for (int i = 0; i <= l; i++) {
         std::vector<T> part;
-        for (int j = f[i]; j < f[i + 1]; j++) {
+        for (int j = f[i]; j < f[i + 1]; j++)
           for (int k = 0; k < v[j]; k++)
             part.push_back(obj->comp[c[j]]);
-          Rcpp::checkUserInterrupt();
-        }
-        partition.push_back(part);
+        partition.push_back(std::move(part));
       }
       return partition;
     }