text: // Copyright (c) 2009-2010 Satoshi Nakamoto
  // Copyright (c) 2009-2015 The Bitcoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #ifndef GASBIT_SCRIPT_STANDARD_H
  #define GASBIT_SCRIPT_STANDARD_H
  
  #include "script/interpreter.h"
  #include "uint256.h"
  
  #include <boost/variant.hpp>
  
  #include <stdint.h>
  
  static const bool DEFAULT_ACCEPT_DATACARRIER = true;
  
  class CKeyID;
  class CScript;
  
  /** A reference to a CScript: the Hash160 of its serialization (see script.h) */
  class CScriptID : public uint160
  {
  public:
      CScriptID() : uint160() {}
      CScriptID(const CScript& in);
      CScriptID(const uint160& in) : uint160(in) {}
  };
  
  static const unsigned int MAX_OP_RETURN_RELAY = 83; //! bytes (+1 for OP_RETURN, +2 for the pushdata opcodes)
  extern bool fAcceptDatacarrier;
  extern unsigned nMaxDatacarrierBytes;
  
  /**
   * Mandatory script verification flags that all new blocks must comply with for
   * them to be valid. (but old blocks may not comply with) Currently just P2SH,
   * but in the future other flags may be added, such as a soft-fork to enforce
   * strict DER encoding.
   * 
   * Failing one of these tests may trigger a DoS ban - see CheckInputs() for
   * details.
   */
  static const unsigned int MANDATORY_SCRIPT_VERIFY_FLAGS = SCRIPT_VERIFY_P2SH;
  
  enum txnouttype
  {
      TX_NONSTANDARD,
      // 'standard' transaction types:
      TX_PUBKEY,
      TX_PUBKEYHASH,
      TX_SCRIPTHASH,
      TX_MULTISIG,
      TX_NULL_DATA,
  };
  
  class CNoDestination {
  public:
      friend bool operator==(const CNoDestination &a, const CNoDestination &b) { return true; }
      friend bool operator<(const CNoDestination &a, const CNoDestination &b) { return true; }
  };
  
  /** 
   * A txout script template with a specific destination. It is either:
   *  * CNoDestination: no destination set
   *  * CKeyID: TX_PUBKEYHASH destination
   *  * CScriptID: TX_SCRIPTHASH destination
   *  A CTxDestination is the internal data type encoded in a CGasbitAddress
   */
  typedef boost::variant<CNoDestination, CKeyID, CScriptID> CTxDestination;
  
  const char* GetTxnOutputType(txnouttype t);
  
  bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<std::vector<unsigned char> >& vSolutionsRet);
  bool ExtractDestination(const CScript& scriptPubKey, CTxDestination& addressRet);
  bool ExtractDestinations(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<CTxDestination>& addressRet, int& nRequiredRet);
  
  CScript GetScriptForDestination(const CTxDestination& dest);
  CScript GetScriptForRawPubKey(const CPubKey& pubkey);
  CScript GetScriptForMultisig(int nRequired, const std::vector<CPubKey>& keys);
  
  #endif // GASBIT_SCRIPT_STANDARD_H
  