Introduce subclass wrappers for STL containers that make them a lot easier

src/zone-containers.h

Index: src/zone-containers.h
diff --git a/src/zone-containers.h b/src/zone-containers.h
index 1295ed7ab950e40f61c9d7d1928bde1166673a17..f3ac1a8598d5ffea9dc76fb8242ff9c8de694b5b 100644
--- a/src/zone-containers.h
+++ b/src/zone-containers.h
@@ -5,6 +5,8 @@
 #ifndef V8_ZONE_CONTAINERS_H_
 #define V8_ZONE_CONTAINERS_H_
 
+#include <deque>
+#include <queue>
 #include <vector>
 
 #include "src/zone-allocator.h"
@@ -12,12 +14,44 @@
 namespace v8 {
 namespace internal {
 
-typedef std::vector<bool, ZoneBoolAllocator> BoolVector;
-
-typedef std::vector<int, ZoneIntAllocator> IntVector;
-typedef IntVector::iterator IntVectorIter;
-typedef IntVector::reverse_iterator IntVectorRIter;
-
+// A wrapper subclass for std::vector to make it easy to construct one
+// that uses a zone allocator.
+template <typename T>
+class ZoneVector : public std::vector<T, zone_allocator<T>> {
+ public:
+  // Constructs an empty vector.
+  explicit ZoneVector(Zone* zone)
+      : std::vector<T, zone_allocator<T>>(zone_allocator<T>(zone)) {}
+
+  // Constructs a new vector and fills it with {size} elements, each
+  // having the value {def}.
+  ZoneVector(int size, T def, Zone* zone)
+      : std::vector<T, zone_allocator<T>>(size, def, zone_allocator<T>(zone)) {}
+};
+
+// A wrapper subclass std::deque to make it easy to construct one
+// that uses a zone allocator.
+template <typename T>
+class ZoneDeque : public std::deque<T, zone_allocator<T>> {
+ public:
+  explicit ZoneDeque(Zone* zone)
+      : std::deque<T, zone_allocator<T>>(zone_allocator<T>(zone)) {}
+};
+
+// A wrapper subclass for std::queue to make it easy to construct one
+// that uses a zone allocator.
+template <typename T>
+class ZoneQueue : public std::queue<T, std::deque<T, zone_allocator<T>>> {
+ public:
+  // Constructs an empty queue.
+  explicit ZoneQueue(Zone* zone)
+      : std::queue<T, std::deque<T, zone_allocator<T>>>(
+            std::deque<T, zone_allocator<T>>(zone_allocator<T>(zone))) {}
+};
+
+// Typedefs to shorten commonly used vectors.
+typedef ZoneVector<bool> BoolVector;
+typedef ZoneVector<int> IntVector;
 } }  // namespace v8::internal
 
 #endif  // V8_ZONE_CONTAINERS_H_