Move some code stubs

iban.cpp

@@ -30,13 +30,6 @@ extern "C"
 
 #include <regex>
 
-extern "C"
-{
-	PG_MODULE_MAGIC;
-
-	using Iban = char;
-}
-
 class Specification {
   public:
 	Specification(std::string structure, size_t length)
@@ -120,7 +113,7 @@ static bool iso7064Mod97_10(std::string iban) {
 }
 
 /**
-* parse the bban structure used to configure each iban specification and returns a matching regular expression.
+* Parse the IBAN structure used to configure each iban specification and returns a matching regular expression.
 * a structure is composed of blocks of 3 characters (one letter and 2 digits). each block represents
 * a logical group in the typical representation of the bban. for each group, the letter indicates which characters
 * are allowed in this group and the following 2-digits number tells the length of the group.
@@ -362,7 +355,7 @@ Validate::Validate() {
 
 /**
 * Separate CXX and C logic to minimize unexpected or malformed symbols due to
-* language conversions. Also catch all exceptions the std++ can throw since
+* language conversions. Also demark all exceptions the std++ can throw since
 * PostgreSQL is not able to handle them.
 *
 * @param {string} iban
@@ -403,6 +396,11 @@ bool account_validate_str(char *iban) {
 
 extern "C"
 {
+
+PG_MODULE_MAGIC;
+
+typedef char Iban;
+
 /**************************************************************************
  * Input/Output functions
  **************************************************************************/
@@ -477,4 +475,5 @@ extern "C"
 
 	PG_RETURN_BOOL(result);
 }
-}
+
+} // extern "C"