Added a streaming object for outputting XML strings (convenience wrapper).

src/utils.h

@@ -548,6 +548,30 @@ inline void xml_print(std::ostream& out,
   out << str;
 }
 
+struct xml_str
+{
+  const string&	    str;
+  const std::size_t depth;
+
+  xml_str(const string& _str, const std::size_t _depth)
+    : str(_str), depth(_depth) {
+    TRACE_CTOR(xml_str, "const string&, const std::size_t");
+  }
+  xml_str(const xml_str& other)
+    : str(other.str), depth(other.depth) {
+    TRACE_CTOR(xml_str, "copy");
+  }
+  ~xml_str() throw() {
+    TRACE_DTOR(xml_str);
+  }
+};
+
+inline std::ostream& operator<<(std::ostream& out, const xml_str& obj) {
+  xml_space(out, obj.depth);
+  out << obj.str;
+  return out;
+}
+
 #define READ_INTO(str, targ, size, var, cond) {				\
   char * _p = targ;							\
   var = str.peek();							\