From 7b25c857ded357c0cb0b481dac6404c27ed0293d Mon Sep 17 00:00:00 2001
From: Willem Jan Palenstijn <Willem.Jan.Palenstijn@cwi.nl>
Date: Wed, 5 Jul 2017 15:15:42 +0200
Subject: Reduce stringstream creation/imbue overhead

---
 src/Utilities.cpp | 19 ++++++++++++++++++-
 src/XMLNode.cpp   | 17 +++++++++++------
 2 files changed, 29 insertions(+), 7 deletions(-)

diff --git a/src/Utilities.cpp b/src/Utilities.cpp
index eb06d8b..eb34092 100644
--- a/src/Utilities.cpp
+++ b/src/Utilities.cpp
@@ -73,7 +73,24 @@ std::vector<float> stringToFloatVector(const std::string &s)
 
 std::vector<double> stringToDoubleVector(const std::string &s)
 {
-	return stringToVector<double>(s);
+	std::vector<double> out;
+	out.reserve(100);
+	std::istringstream iss;
+	iss.imbue(std::locale::classic());
+	size_t current = 0;
+	size_t next;
+	do {
+		next = s.find_first_of(",;", current);
+		std::string t = s.substr(current, next - current);
+		iss.str(t);
+		iss.clear();
+		double f;
+		iss >> f;
+		out.push_back(f);
+		current = next + 1;
+	} while (next != std::string::npos);
+
+	return out;
 }
 
 template<typename T>
diff --git a/src/XMLNode.cpp b/src/XMLNode.cpp
index 3b7237f..0ddc511 100644
--- a/src/XMLNode.cpp
+++ b/src/XMLNode.cpp
@@ -30,6 +30,9 @@ along with the ASTRA Toolbox. If not, see <http://www.gnu.org/licenses/>.
 #include "rapidxml/rapidxml.hpp"
 #include "rapidxml/rapidxml_print.hpp"
 
+#include <sstream>
+#include <iomanip>
+
 
 using namespace rapidxml;
 using namespace astra;
@@ -399,8 +402,6 @@ void XMLNode::setContent(double* pfList, int _iSize)
 template<typename T>
 static std::string setContentMatrix_internal(T* _pfMatrix, int _iWidth, int _iHeight, bool transposed)
 {
-	std::string str = "";
-
 	int s1,s2;
 
 	if (!transposed) {
@@ -411,17 +412,21 @@ static std::string setContentMatrix_internal(T* _pfMatrix, int _iWidth, int _iHe
 		s2 = 1;
 	}
 
+	std::ostringstream s;
+	s.imbue(std::locale::classic());
+	s << std::setprecision(17);
+
 	for (int y = 0; y < _iHeight; ++y) {
 		if (_iWidth > 0)
-			str += StringUtil::toString(_pfMatrix[0*s1 + y*s2]);
+			s << _pfMatrix[0*s1 + y*s2];
 		for (int x = 1; x < _iWidth; x++)
-			str += "," + StringUtil::toString(_pfMatrix[x*s1 + y*s2]);
+			s << "," << _pfMatrix[x*s1 + y*s2];
 
 		if (y != _iHeight-1)
-			str += ";";
+			s << ";";
 	}
 
-	return str;
+	return s.str();
 }
 
 void XMLNode::setContent(float32* _pfMatrix, int _iWidth, int _iHeight, bool transposed)
-- 
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