From 5bae0794b5f3f71c10765de7e7df066a5c4a1914 Mon Sep 17 00:00:00 2001
From: Kenneth Leiter <kenneth.leiter@arl.army.mil>
Date: Fri, 28 Jun 2013 15:31:07 -0400
Subject: [PATCH] ENH: Store array type precision in string form.

Slight performance improvement for large file writes.
---
 core/XdmfArrayType.cpp | 7 ++++---
 core/XdmfArrayType.hpp | 5 +++--
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/core/XdmfArrayType.cpp b/core/XdmfArrayType.cpp
index 7b679fbb..d880559b 100644
--- a/core/XdmfArrayType.cpp
+++ b/core/XdmfArrayType.cpp
@@ -109,6 +109,9 @@ XdmfArrayType::XdmfArrayType(const std::string & name,
   mName(name),
   mPrecision(precision)
 {
+  std::stringstream precisionString;
+  precisionString << precision;
+  mPrecisionString = precisionString.str();
 }
 
 XdmfArrayType::~XdmfArrayType()
@@ -193,7 +196,5 @@ void
 XdmfArrayType::getProperties(std::map<std::string, std::string> & collectedProperties) const
 {
   collectedProperties.insert(std::make_pair("DataType", mName));
-  std::stringstream precision;
-  precision << mPrecision;
-  collectedProperties.insert(std::make_pair("Precision", precision.str()));
+  collectedProperties.insert(std::make_pair("Precision", mPrecisionString));
 }
diff --git a/core/XdmfArrayType.hpp b/core/XdmfArrayType.hpp
index cd611c6a..3ce38d3d 100644
--- a/core/XdmfArrayType.hpp
+++ b/core/XdmfArrayType.hpp
@@ -111,8 +111,9 @@ private:
   static shared_ptr<const XdmfArrayType>
   New(const std::map<std::string, std::string> & itemProperties);
 
-  std::string mName;
-  unsigned int mPrecision;
+  const std::string mName;
+  const unsigned int mPrecision;
+  std::string mPrecisionString;
 };
 
 #endif /* XDMFARRAYTYPE_HPP_ */
-- 
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