IO/config: declare some variables as constant

Author: andrea-iob

src/IO/configuration_JSON.cpp

@@ -263,7 +263,7 @@ void writeConfiguration(const std::string &filename, const Config *rootConfig, b
 void writeNode(const Config *config, rapidjson::Value &rootJSONData, rapidjson::Document::AllocatorType &allocator)
 {
     // Write the options
-    for (auto &entry : config->getOptions()) {
+    for (const auto &entry : config->getOptions()) {
         const std::string &configKey   = entry.first;
         const std::string &configValue = entry.second;
 

src/IO/configuration_XML.cpp

@@ -84,7 +84,7 @@ void readNode(xmlNodePtr root, Config *config)
 void writeNode(xmlTextWriterPtr writer, const Config *config, const std::string &encoding)
 {
     // Write the options
-    for (auto &entry : config->getOptions()) {
+    for (const auto &entry : config->getOptions()) {
         const std::string &key   = entry.first;
         const std::string &value = entry.second;
 

src/IO/configuration_config.cpp

@@ -408,15 +408,15 @@ void Config::dump(std::ostream &out, int indentLevel) const
     out << std::endl;
     out << indent << "Options..." << std::endl;
     if (getOptionCount() > 0) {
-        for (auto &entry : getOptions()) {
+        for (const auto &entry : getOptions()) {
             out << indent << padding << entry.first << " = " << entry.second << std::endl;
         }
     } else {
         out << indent << padding << "No options." << std::endl;
     }
 
     ++indentLevel;
-    for (auto &entry : getSections()) {
+    for (const auto &entry : getSections()) {
         out << std::endl;
         out << indent << padding << "::: Section " << entry.first << " :::" << std::endl;
         entry.second->dump(out, indentLevel);