Use transparent comparator in mColumnNames to avoid creating std::string when comparing

Author: Kacperos155

include/SQLiteCpp/Statement.h

@@ -703,7 +703,7 @@ class Statement
     bool                    mbDone{false};          //!< true when the last executeStep() had no more row to fetch
 
     /// Map of columns index by name (mutable so getColumnIndex can be const)
-    mutable std::map<std::string, int>  mColumnNames{};
+    mutable std::map<std::string, int, std::less<>>  mColumnNames{};
 };
 
 

src/Statement.cpp

@@ -275,7 +275,7 @@ int Statement::getColumnIndex(const char* apName) const
         for (int i = 0; i < mColumnCount; ++i)
         {
             const char* pName = sqlite3_column_name(getPreparedStatement(), i);
-            mColumnNames[pName] = i;
+            mColumnNames.emplace(pName, i);
         }
     }
 
@@ -288,7 +288,7 @@ int Statement::getColumnIndex(const char* apName) const
     return iIndex->second;
 }
 
-const char * Statement::getColumnDeclaredType(const int aIndex) const
+const char* Statement::getColumnDeclaredType(const int aIndex) const
 {
     checkIndex(aIndex);
     const char * result = sqlite3_column_decltype(getPreparedStatement(), aIndex);