枚举可以在 MQL4/MQL5 中有自己的方法吗？我可以将字符串作为值存储在枚举中吗？

Question

我正在尝试编写一个代码，我想将 ENUM 用作 class 并在其上调用一些方法。例如 toString()。或者我可以用 Mql4/Mql5 语言将字符串值存储在枚举中吗？

Answer 1

否，枚举不能有方法。但是，您可以使用多态行为来模仿这个所需的属性。

#property strict
#property script_show_inputs
#include <Object.mqh>
//+------------------------------------------------------------------+
enum ENUM_STRAT {STRAT1, STRAT2};
//+------------------------------------------------------------------+
input ENUM_STRAT  inpStrategy=STRAT1;
//+------------------------------------------------------------------+
class StrategyBase : public CObject
{
   public: virtual string toString()=0;  
};
//+------------------------------------------------------------------+
class Strategy1 : public StrategyBase
{
   public: virtual string toString() override { return "Strategy #1"; }
};
//+------------------------------------------------------------------+
class Strategy2 : public StrategyBase
{
   public: virtual string toString() override { return "Strategy #2"; }
};
//+------------------------------------------------------------------+
StrategyBase* initStrategy()
{
   switch(inpStrategy)
   {
      case STRAT1:
         return new Strategy1();
      default:
         return new Strategy2();
   }
}
//+------------------------------------------------------------------+
//| Script program start function                                    |
//+------------------------------------------------------------------+
void OnStart()
{
   StrategyBase *strategy = initStrategy();
   printf("The result of the toString() method is %s", strategy.toString());
   delete strategy;
}

枚举可以在 MQL4/MQL5 中有自己的方法吗？我可以将字符串作为值存储在枚举中吗？

Can an Enum have its own method in MQL4/MQL5. Can i store string in an Enum as a value?

enums

mql4

mql5