text: //------------------------------------------------------------------------------
  /*
      This file is part of rippled: https://github.com/ripple/rippled
      Copyright (c) 2012, 2013 Ripple Labs Inc.
  
      Permission to use, copy, modify, and/or distribute this software for any
      purpose  with  or without fee is hereby granted, provided that the above
      copyright notice and this permission notice appear in all copies.
  
      THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
      MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
      ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
      WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
      ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
      OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
  //==============================================================================
  
  #ifndef RIPPLE_LEDGER_APPLYVIEWIMPL_H_INCLUDED
  #define RIPPLE_LEDGER_APPLYVIEWIMPL_H_INCLUDED
  
  #include <ripple/ledger/OpenView.h>
  #include <ripple/ledger/detail/ApplyViewBase.h>
  #include <ripple/protocol/STAmount.h>
  #include <ripple/protocol/TER.h>
  #include <boost/optional.hpp>
  
  namespace ripple {
  
  /** Editable, discardable view that can build metadata for one tx.
  
      Iteration of the tx map is delegated to the base.
  
      @note Presented as ApplyView to clients.
  */
  class ApplyViewImpl
      : public detail::ApplyViewBase
  {
  public:
      ApplyViewImpl() = delete;
      ApplyViewImpl (ApplyViewImpl const&) = delete;
      ApplyViewImpl& operator= (ApplyViewImpl&&) = delete;
      ApplyViewImpl& operator= (ApplyViewImpl const&) = delete;
  
  #ifdef _MSC_VER
      ApplyViewImpl (ApplyViewImpl&& other)
          : ApplyViewBase (std::move(other))
          , deliver_ (std::move(other.deliver_))
      {
      }
  #else
      ApplyViewImpl (ApplyViewImpl&&) = default;
  #endif
  
      ApplyViewImpl(
          ReadView const* base, ApplyFlags flags);
  
      /** Apply the transaction.
  
          After a call to `apply`, the only valid
          operation on this object is to call the
          destructor.
      */
      void
      apply (OpenView& to,
          STTx const& tx, TER ter,
              beast::Journal j);
  
      /** Set the amount of currency delivered.
  
          This value is used when generating metadata
          for payments, to set the DeliveredAmount field.
          If the amount is not specified, the field is
          excluded from the resulting metadata.
      */
      void
      deliver (STAmount const& amount)
      {
          deliver_ = amount;
      }
  
      /** Get the number of modified entries
      */
      std::size_t
      size ();
  
      /** Visit modified entries
      */
      void
      visit (
          OpenView& target,
          std::function <void (
              uint256 const& key,
              bool isDelete,
              std::shared_ptr <SLE const> const& before,
              std::shared_ptr <SLE const> const& after)> const& func);
  private:
      boost::optional<STAmount> deliver_;
  };
  
  } // ripple
  
  #endif
  