From 65251a9d8685cbdb24b2b4f5ff65ef3e00a0d634 Mon Sep 17 00:00:00 2001
From: vng <viktor.govako@gmail.com>
Date: Fri, 27 Mar 2015 13:52:54 +0300
Subject: [PATCH] Added emplace_back to buffer_vector.

---
 base/base_tests/buffer_vector_test.cpp |  6 +++---
 base/buffer_vector.hpp                 | 22 ++++++++++++++++++++++
 2 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/base/base_tests/buffer_vector_test.cpp b/base/base_tests/buffer_vector_test.cpp
index 4e85d4ca96..3a209197f4 100644
--- a/base/base_tests/buffer_vector_test.cpp
+++ b/base/base_tests/buffer_vector_test.cpp
@@ -275,8 +275,8 @@ typedef buffer_vector<CopyCtorChecker, 2> VectorT;
 VectorT GetVector()
 {
   VectorT v;
-  v.push_back("0");
-  v.push_back("1");
+  v.emplace_back("0");
+  v.emplace_back("1");
   return v;
 }
 
@@ -294,7 +294,7 @@ UNIT_TEST(BufferVectorMove)
   VectorT v1 = GetVector();
   TestVector(v1, 2);
 
-  v1.push_back("2");
+  v1.emplace_back("2");
   TestVector(v1, 3);
 
   VectorT v2(move(v1));
diff --git a/base/buffer_vector.hpp b/base/buffer_vector.hpp
index 61e45fc300..31fd71bb7f 100644
--- a/base/buffer_vector.hpp
+++ b/base/buffer_vector.hpp
@@ -316,6 +316,28 @@ public:
     }
   }
 
+  template <class... Args>
+  void emplace_back(Args &&... args)
+  {
+    if (IsDynamic())
+      m_dynamic.emplace_back(args...);
+    else
+    {
+      if (m_size < N)
+      {
+        value_type v(args...);
+        Swap(v, m_static[m_size++]);
+      }
+      else
+      {
+        ASSERT_EQUAL(m_size, N, ());
+        SwitchToDynamic();
+        m_dynamic.emplace_back(args...);
+        ASSERT_EQUAL(m_dynamic.size(), N + 1, ());
+      }
+    }
+  }
+
   template <typename IterT> void insert(const_iterator where, IterT beg, IterT end)
   {
     ptrdiff_t const pos = where - data();