[trivial] add doxygen-compatible comments to CAffectedKeysVisitor

Author: PierreRochard

src/wallet/wallet.cpp

@@ -102,14 +102,25 @@ std::string COutput::ToString() const
     return strprintf("COutput(%s, %d, %d) [%s]", tx->GetHash().ToString(), i, nDepth, FormatMoney(tx->tx->vout[i].nValue));
 }
 
+/** A class to identify which pubkeys a script and a keystore have in common. */
 class CAffectedKeysVisitor : public boost::static_visitor<void> {
 private:
     const CKeyStore &keystore;
     std::vector<CKeyID> &vKeys;
 
 public:
+    /**
+     * @param[in] keystoreIn The CKeyStore that is queried for the presence of a pubkey.
+     * @param[out] vKeysIn A vector to which a script's pubkey identifiers are appended if they are in the keystore.
+     */
     CAffectedKeysVisitor(const CKeyStore &keystoreIn, std::vector<CKeyID> &vKeysIn) : keystore(keystoreIn), vKeys(vKeysIn) {}
 
+    /**
+     * Apply the visitor to each destination in a script, recursively to the redeemscript
+     * in the case of p2sh destinations.
+     * @param[in] script The CScript from which destinations are extracted.
+     * @post Any CKeyIDs that script and keystore have in common are appended to the visitor's vKeys.
+     */
     void Process(const CScript &script) {
         txnouttype type;
         std::vector<CTxDestination> vDest;