From 71344f78df2de0d3db9f36b47df087cd12074e55 Mon Sep 17 00:00:00 2001
From: artemp <artem@mapnik.org>
Date: Mon, 3 Jul 2017 15:18:23 +0200
Subject: [PATCH] wkb_reader : pre-allocate number of polygons in
 `multi_polygon` and number of geometries in `geometry_collection` via
 `vector.reserce(...)`

---
 src/wkb.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/wkb.cpp b/src/wkb.cpp
index 644ee81ae..6414e65d7 100644
--- a/src/wkb.cpp
+++ b/src/wkb.cpp
@@ -351,6 +351,7 @@ private:
     {
         int num_polys = read_integer();
         mapnik::geometry::multi_polygon<double> multi_poly;
+        multi_poly.reserve(num_polys);
         for (int i = 0; i < num_polys; ++i)
         {
             pos_ += 5;
@@ -363,6 +364,7 @@ private:
     {
         int num_geometries = read_integer();
         mapnik::geometry::geometry_collection<double> collection;
+        collection.reserve(num_geometries);
         for (int i = 0; i < num_geometries; ++i)
         {
             pos_ += 1; // skip byte order