Creating uCalc instances

ID: 78

See: (Constructor), Clone, Release 
				
					using uCalcSoftware;

var uc = new uCalc();
uc.DefineVariable("x = 123");

var uc1 = new uCalc(); // Creates a new instance
Console.WriteLine(uc1.EvalStr("x")); // uc1 does not have a variable named x
uc1.Release(); // Releases uc1 if it is no longer needed

var uc2 = uc.Clone(); // Creates new instance that is a clone of uc
Console.WriteLine(uc2.EvalStr("x")); // starts with the value of x obtained from uc
uc2.Eval("x = 456"); // Changes the value of x in uc1 but not uc
Console.WriteLine(uc2.EvalStr("x"));
Console.WriteLine(uc.EvalStr("x")); // The original x in uc remains unchanged
uc2.Release();

// Language specific - auto-releasing uCalc object

{ // Instances pointed to by neither uCalc1 nor uCalc2 will be released when they go out of scope
   var uCalc1 = new uCalc();
   var uCalc2 = uc.Clone();
   // Call uCalc1.Release() and uCalc2.Release() explicitly if want to release them
}

{ // The instances that both uCalc1 and uCalc2 point to will be released when uCalc1 and uCalc2 go out of scope
   using var uCalc1 = new uCalc();
   using var uCalc2 = uc.Clone();

   // No need for uCalc1.Release() or uCalc2.Release(), they will automatically be released
}

				
			
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					#include <iostream>
#include "uCalc.h"

using namespace std;
using namespace uCalcSoftware;

int main() {
   uCalc uc;
   uc.DefineVariable("x = 123");

   uCalc uc1; // Creates a new instance
   cout << uc1.EvalStr("x") << endl; // uc1 does not have a variable named x
   uc1.Release(); // Releases uc1 if it is no longer needed

   auto uc2 = uc.Clone(); // Creates new instance that is a clone of uc
   cout << uc2.EvalStr("x") << endl; // starts with the value of x obtained from uc
   uc2.Eval("x = 456"); // Changes the value of x in uc1 but not uc
   cout << uc2.EvalStr("x") << endl;
   cout << uc.EvalStr("x") << endl; // The original x in uc remains unchanged
   uc2.Release();

   // Language specific - auto-releasing uCalc object

   { // Instances pointed to by neither uCalc1 nor uCalc2 will be released when they go out of scope
      auto uCalc1 = new uCalc();
      auto uCalc2 = uc.Clone();
      // Call uCalc1.Release() and uCalc2.Release() explicitly if want to release them
   }

   { // The instances that both uCalc1 and uCalc2 point to will be released when uCalc1 and uCalc2 go out of scope
      
      uCalc uCalc1;
      uCalc uCalc2(uc.Clone());
      // No need for uCalc1.Release() or uCalc2.Release(), they will automatically be released
   }

}
				
			
Undefined identifier
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					Imports System
Imports uCalcSoftware
Public Module Program
   Public Sub Main()
      Dim uc As New uCalc()
      uc.DefineVariable("x = 123")
      
      Dim uc1 As New uCalc() '// Creates a new instance
      Console.WriteLine(uc1.EvalStr("x")) '// uc1 does not have a variable named x
      uc1.Release() '// Releases uc1 if it is no longer needed
      
      Dim uc2 = uc.Clone() '// Creates new instance that is a clone of uc
      Console.WriteLine(uc2.EvalStr("x")) '// starts with the value of x obtained from uc
      uc2.Eval("x = 456") '// Changes the value of x in uc1 but not uc
      Console.WriteLine(uc2.EvalStr("x"))
      Console.WriteLine(uc.EvalStr("x")) '// The original x in uc remains unchanged
      uc2.Release()
      
      '// Language specific - auto-releasing uCalc object
      #If False
         { '// Instances pointed to by neither uCalc1 nor uCalc2 will be released when they go out of scope
         Dim uCalc1 = new uCalc()
         Dim uCalc2 = uc.Clone()
         '// Call uCalc1.Release() and uCalc2.Release() explicitly if want to release them
         }
         
         { '// The instances that both uCalc1 and uCalc2 point to will be released when uCalc1 and uCalc2 go out of scope
         
         
         '// No need for uCalc1.Release() or uCalc2.Release(), they will automatically be released
         }
         #End If
      End Sub
   End Module
				
			
Undefined identifier
123
456
123
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