Added std_string support. Renamed SWIG_exception to SWIG_exc to avoid name collision with macro in Lib/exception.i.

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/branches/gsoc2008-maciekd@10720 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Lib/c/std_string.i

@@ -0,0 +1,50 @@
+%{
+#include <string>
+%}
+
+namespace std {
+
+// use "const string &" typemaps for wrapping member strings
+%naturalvar string;
+
+class string;
+
+%typemap(ctype) string "char *"
+%typemap(ctype) const string & "char *"
+%typemap(couttype) string  "char *"
+%typemap(couttype) const string & "char *"
+
+%typemap(in) string {
+  if ($input) {
+    $1.assign($input);
+  }
+  else {
+    $1.resize(0);
+  }
+}
+
+%typemap(in) const string & {
+  if ($input) {
+    $1 = new std::string($input);
+  }
+  else {
+    $1 = new std::string();
+    $1->resize(0);
+  }
+}
+
+%typemap(freearg) const string & {
+  if ($1)
+    delete $1;
+}
+
+%typemap(out) string, const string & {
+  const char *str = cppresult.c_str();
+  size_t len = strlen(str);
+  $result = (char *) malloc(len + 1);
+  memcpy($result, str, len);
+  $result[len] = '\0';
+}
+
+}
+