mql5/Include/Expert/ExpertMoney.mqh

//+------------------------------------------------------------------+
//|                                                  ExpertMoney.mqh |
//|                             Copyright 2000-2025, MetaQuotes Ltd. |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#include "ExpertBase.mqh"
//+------------------------------------------------------------------+
//| Class CExpertMoney.                                              |
//| Purpose: Base class money managment.                             |
//| Derives from class CExpertBase.                                  |
//+------------------------------------------------------------------+
class CExpertMoney : public CExpertBase
  {
protected:
   //--- input parameters
   double            m_percent;

public:
                     CExpertMoney(void);
                    ~CExpertMoney(void);
   //--- methods of setting adjustable parameters
   void              Percent(double percent) { m_percent=percent; }
   //--- method of verification of settings
   virtual bool      ValidationSettings();
   //---
   virtual double    CheckOpenLong(double price,double sl);
   virtual double    CheckOpenShort(double price,double sl);
   virtual double    CheckReverse(CPositionInfo *position,double sl);
   virtual double    CheckClose(CPositionInfo *position);
  };
//+------------------------------------------------------------------+
//| Constructor                                                      |
//+------------------------------------------------------------------+
void CExpertMoney::CExpertMoney(void) : m_percent(10.0)
  {
  }
//+------------------------------------------------------------------+
//| Destructor                                                       |
//+------------------------------------------------------------------+
void CExpertMoney::~CExpertMoney(void)
  {
  }
//+------------------------------------------------------------------+
//| Validation settings protected data.                              |
//+------------------------------------------------------------------+
bool CExpertMoney::ValidationSettings()
  {
   if(!CExpertBase::ValidationSettings())
      return(false);
//--- initial data checks
   if(m_percent<0.0 || m_percent>100.0)
     {
      printf(__FUNCTION__+": percentage of risk should be in the range from 0 to 100 inclusive");
      return(false);
     }
//--- ok
   return(true);
  }
//+------------------------------------------------------------------+
//| Getting lot size for open long position.                         |
//+------------------------------------------------------------------+
double CExpertMoney::CheckOpenLong(double price,double sl)
  {
   if(m_symbol==NULL)
      return(0.0);
//---
   double lot;
   if(price==0.0)
      lot=m_account.MaxLotCheck(m_symbol.Name(),ORDER_TYPE_BUY,m_symbol.Ask(),m_percent);
   else
      lot=m_account.MaxLotCheck(m_symbol.Name(),ORDER_TYPE_BUY,price,m_percent);
   if(lot<m_symbol.LotsMin())
      return(0.0);
//---
   return(m_symbol.LotsMin());
  }
//+------------------------------------------------------------------+
//| Getting lot size for open short position.                        |
//+------------------------------------------------------------------+
double CExpertMoney::CheckOpenShort(double price,double sl)
  {
   if(m_symbol==NULL)
      return(0.0);
//---
   double lot;
   if(price==0.0)
      lot=m_account.MaxLotCheck(m_symbol.Name(),ORDER_TYPE_SELL,m_symbol.Bid(),m_percent);
   else
      lot=m_account.MaxLotCheck(m_symbol.Name(),ORDER_TYPE_SELL,price,m_percent);
   if(lot<m_symbol.LotsMin())
      return(0.0);
//---
   return(m_symbol.LotsMin());
  }
//+------------------------------------------------------------------+
//| Getting lot size for reverse.                                    |
//+------------------------------------------------------------------+
double CExpertMoney::CheckReverse(CPositionInfo *position,double sl)
  {
   double lots=0.0;
//---
   if(position.PositionType()==POSITION_TYPE_BUY)
      lots=CheckOpenShort(m_symbol.Bid(),sl);
   if(position.PositionType()==POSITION_TYPE_SELL)
      lots=CheckOpenLong(m_symbol.Ask(),sl);
//---
   if(lots!=0.0) lots+=position.Volume();
//---
   return(lots);
  }
//+------------------------------------------------------------------+
//| Getting lot size for close.                                      |
//+------------------------------------------------------------------+
double CExpertMoney::CheckClose(CPositionInfo *position)
  {
   if(m_percent==0.0)
      return(0.0);
//---
   if(-position.Profit()>m_account.Balance()*m_percent/100.0)
      return(position.Volume());
//---
   return(0.0);
  }
//+------------------------------------------------------------------+