Reset state info in copy CTOR

Refactor reset code

Author: Blake-Madden

tinyexpr.cpp

@@ -2273,20 +2273,7 @@ te_expr* te_parser::te_compile(const std::string_view expression, std::set<te_va
 //--------------------------------------------------
 bool te_parser::compile(const std::string_view expression)
     {
-    // reset everything from previous call
-    m_errorPos = te_parser::npos;
-    m_lastErrorMessage.clear();
-    m_result = te_nan;
-    m_parseSuccess = false;
-    te_free(m_compiledExpression);
-    m_compiledExpression = nullptr;
-    m_currentVar = m_functions.cend();
-    m_varFound = false;
-#ifndef TE_NO_BOOKKEEPING
-    m_usedFunctions.clear();
-    m_usedVars.clear();
-#endif
-    m_resolvedVariables.clear();
+    reset_state();
     if (get_list_separator() == get_decimal_separator())
         {
         throw std::runtime_error("List and decimal separators cannot be the same");

tinyexpr.h

@@ -262,6 +262,8 @@ class te_parser
         m_decimalSeparator = that.m_decimalSeparator;
         m_listSeparator = that.m_listSeparator;
 
+        reset_state();
+
         return *this;
         }
 
@@ -624,6 +626,24 @@ class te_parser
     static std::string info();
 
   private:
+    /// Reset everything from previous call.
+    void reset_state()
+        {
+        m_errorPos = te_parser::npos;
+        m_lastErrorMessage.clear();
+        m_result = te_nan;
+        m_parseSuccess = false;
+        te_free(m_compiledExpression);
+        m_compiledExpression = nullptr;
+        m_currentVar = m_functions.cend();
+        m_varFound = false;
+#ifndef TE_NO_BOOKKEEPING
+        m_usedFunctions.clear();
+        m_usedVars.clear();
+#endif
+        m_resolvedVariables.clear();
+        }
+
     /// @brief Resets any resolved variables from USR if not being cached.
     void reset_usr_resolved_if_necessary()
         {