MT#59962 AmUtils: add string to double conversion

Add support for floating types.

Change-Id: I75ee2ff1a6f545a7a3cd2f27014029ca9880d207

core/AmUtils.cpp

@@ -284,6 +284,12 @@ bool str2int(const string& str, int& result)
   return str2int(s,result);
 }
 
+bool str2int(const string& str, double& result)
+{
+  char* s = (char*)str.c_str();
+  return atof(s);
+}
+
 bool str2int(char*& str, int& result, char sep)
 {
   int ret=0;

core/AmUtils.h

@@ -148,6 +148,8 @@ bool str2int(char*& str, unsigned int& result, char sep = ' ');
  */
 bool str2int(const string& str, int& result);
 
+bool str2int(const string& str, double& result);
+
 /** 
  * Internal version of preceeding 'str2int' method.
  * @param str    [in,out] gets incremented until sep char or error occurs