Using wstring instead of wstringstream where appropriate (#881)

src/CalcManager/Ratpack/conv.cpp

@@ -1204,78 +1204,73 @@ wstring NumberToString(_Inout_ PNUMBER& pnum, int format, uint32_t radix, int32_
     }
 
     // Begin building the result string
-    wstringstream resultStream{};
+    wstring result;
 
     // Make sure negative zeros aren't allowed.
     if ((pnum->sign == -1) && (length > 0))
     {
-        resultStream << L'-';
+        result = L'-';
     }
 
     if (exponent <= 0 && !useSciForm)
     {
-        resultStream << L'0';
-        resultStream << g_decimalSeparator;
+        result += L'0';
+        result += g_decimalSeparator;
         // Used up a digit unaccounted for.
     }
 
     while (exponent < 0)
     {
-        resultStream << L'0';
+        result += L'0';
         exponent++;
     }
 
     while (length > 0)
     {
         exponent--;
-        resultStream << DIGITS[*pmant--];
+        result += DIGITS[*pmant--];
         length--;
 
         // Be more regular in using a decimal point.
         if (exponent == 0)
         {
-            resultStream << g_decimalSeparator;
+            result += g_decimalSeparator;
         }
     }
 
     while (exponent > 0)
     {
-        resultStream << L'0';
+        result += L'0';
         exponent--;
         // Be more regular in using a decimal point.
         if (exponent == 0)
         {
-            resultStream << g_decimalSeparator;
+            result += g_decimalSeparator;
         }
     }
 
     if (useSciForm)
     {
-        resultStream << (radix == 10 ? L'e' : L'^');
-        resultStream << (eout < 0 ? L'-' : L'+');
+        result += (radix == 10 ? L'e' : L'^');
+        result += (eout < 0 ? L'-' : L'+');
         eout = abs(eout);
-        wstringstream exponentStream{};
+        wstring expString{};
         do
         {
-            exponentStream << DIGITS[eout % radix];
+            expString += DIGITS[eout % radix];
             eout /= radix;
         } while (eout > 0);
 
-        auto expString = exponentStream.str();
-        for (auto ritr = expString.rbegin(); ritr != expString.rend(); ritr++)
-        {
-            resultStream << *ritr;
-        }
+        result.insert(result.end(), expString.crbegin(), expString.crend());
     }
 
     // Remove trailing decimal
-    auto resultString = resultStream.str();
-    if (!resultString.empty() && resultString.back() == g_decimalSeparator)
+    if (!result.empty() && result.back() == g_decimalSeparator)
     {
-        resultString.pop_back();
+        result.pop_back();
     }
 
-    return resultString;
+    return result;
 }
 
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