From 56dd9f04c701aa3ac340e95065bf83de20373c8b Mon Sep 17 00:00:00 2001
From: Russell Yanofsky <russ@yanofsky.org>
Date: Sat, 15 Feb 2020 19:09:09 -0800
Subject: Make VectorFormatter support stateful formatters

---
 src/prevector.h | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

(limited to 'src/prevector.h')

diff --git a/src/prevector.h b/src/prevector.h
index 09debedc4f..6d690e7f96 100644
--- a/src/prevector.h
+++ b/src/prevector.h
@@ -424,15 +424,20 @@ public:
         return first;
     }
 
-    void push_back(const T& value) {
+    template<typename... Args>
+    void emplace_back(Args&&... args) {
         size_type new_size = size() + 1;
         if (capacity() < new_size) {
             change_capacity(new_size + (new_size >> 1));
         }
-        new(item_ptr(size())) T(value);
+        new(item_ptr(size())) T(std::forward<Args>(args)...);
         _size++;
     }
 
+    void push_back(const T& value) {
+        emplace_back(value);
+    }
+
     void pop_back() {
         erase(end() - 1, end());
     }
-- 
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