Object Oriented Programming

Quoting 7bit

Disliked

IMHO it should be considered a crime recommending C++ to a newbie.

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Quoting 7bit

Disliked

They should have made an API to make it possible to write EAs in any language instead of creating yet another incompatible half-baked programming language.

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Quoting bundyraider

Disliked

In what respect?

...Seriously.

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Quoting bundyraider

Disliked

Sams Teach Yourself C++ in 21 Days - by Jesse Liberty

C++ is still used a lot, and to top it off, MQL5 is aligned very closely to it.

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Quoting 7bit

Disliked

C++ is the most complicated and beginner unfriendly language that is currently in existence.

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Quoting 7bit

Disliked

C++ belongs into museum of historical technological curiosities, thats the only adequate place for it.

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Quoting Adal

Disliked

any high-performance job is a good match for the power of C++, and you don't have many alternatives either.

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Quoting 7bit

Disliked

C++ is not a beginner language. It is a very difficult to use tool for advanced programmers only, full of dangerous traps and landmines and most things can (and should) be done without the need for this dangerous weapon because there are better alternatives for almost any use case. .

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Quoting Adal

Disliked

That should be 21 years, not 21 days Seriously. C++ is a insanely complex language: http://lbrandy.com/blog/2010/03/neve...ys-he-knows-c/

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Quoting bundyraider

Disliked

It's (and c) still big in the games programming industry.

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Quoting 7bit

Disliked

And this should be changed as soon as possible. C/C++ has produced enough damage already.

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Quoting 7bit

Disliked

And this should be changed as soon as possible. C/C++ has produced enough damage already.

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Quoting Adal

Disliked

There is a difference between Pascal/Ada/... being in theory able to be as fast as C++ and being in practice as fast as C++. Billions of dollars were spent on the optimizers in VC++/GCC.

Just like CISC vs. RISC. RISC is faster in theory, but not in practice, because billions were spent by Intel/AMD on making CISC fast. Yes, the internal implementation is RISC like, but it doesn't matter. From outside is CISC.

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Quoting markmm

Disliked

I would learn C, object oriented programming is overrated and not the only way to program, its useful for UI toolkits say, but procedural programming is as productive if you are writing a personal program.

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Quoting Ronald Raygun

Disliked

There aren't too many useful guides for MQL5 out just yet, and I was wondering if anyone could recommend a good object oriented programming book.

I'm familiar with the power of object oriented programming, but I have no idea how to wield it.

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Quoting Ronald Raygun

Disliked

The main reason why I'm pushing for OOP is because of MT5.

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Quoting Ronald Raygun

Disliked

The bits that I do know about OOP are:

 

1. I can write my trading logic once, and instantiate it multiple times for different currency pairs, risk levels, etc.
2. I can assign trades to a unique object and theoretically manage each trade independently.

I just don't really understand how to translate this into code...

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class BreakOutTradingSystem : public TradingSystem
{
public:
    // constructor
    BreakOutTradingSystem(string symbol, int stopLoss, double riskReward)
    {
        _riskReward = riskReward;
        _stopLoss = stopLoss;
        _symbol = symbol;
    }

    void newPrice(int bid, int ask)
    {
         if (conditionToBuy)
         {
             position = openPosition(BUY, MARKET, _symbol, 10000);
             position.setStopLoss(position.price - _stopLoss);
             position.setTakeProfit(position.price + _stopLoss * _riskReward);
             _positions.add(position);
         }
    }

private:
    string _symbol;
    int _stopLoss;
    double _riskReward;
    List<Position> _positions;
};

// Global variables, note that they are of the base type
TradingSystem firstSystem;
TradingSystem secondSystem;

// MetaTrader calls this
void init()
{
    firstSystem = new BreakOutTradingSystem("EUR/USD", 100, 2.0);
    secondSystem = new BreakOutTradingSystem("USD/JPY", 50, 1.5);
}

// MetaTrader calls this
void newPrice(int bid, int ask)
{
    firstSystem.newPrice(bid, ask);
    secondSystem.newPrice(bid, ask);
}

Quoting markmm

Disliked

Basically a class is like a struct but with the option to have functions as part of it so instead of

push(&stack, a);

you would have

stack.push(a);

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