caller wich sense have ?

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Hi i have  this part  of  script  , is  a part of common_functions.mqh  , i not underestund a sense  of  this variable  caller  anyone  can explain me ?  thanks 


/**
* Drop-in replacement for OrderSend().
* Try to handle all errors and locks and return only if successful
* or if the error can not be handled or waited for.
*/
int orderSendReliable(
   string symbol,
   int cmd,
   double volume,
   double price,
   int slippage,
   double stoploss,
   double takeprofit,
   string comment = "",
   int magic = 0,
   datetime expiration = 0,
   color arrow_color = CLR_NONE, 
   string caller = ""
) {
   int ticket;
   int err;
   Print("orderSendReliable("
         + symbol + ","
         + IntegerToString(cmd) + ","
         + DoubleToString(volume) + ","
         + DoubleToString(price) + ","
         + IntegerToString(slippage) + ","
         + DoubleToString(stoploss) + ","
         + DoubleToString(takeprofit) + ","
         + comment + ","
         + IntegerToString(magic) + ","
         + TimeToString(expiration) + ","
         + ColorToString(arrow_color) + "," 
         + caller + ")");

   while (true) {
      if (IsStopped()) {
         Print("orderSendReliable(): Trading is stopped!");
         return(-1);
      }
      RefreshRates();
      if (cmd == OP_BUY) {
         price = MarketInfo(symbol, MODE_ASK);
      }
      if (cmd == OP_SELL) {
         price = MarketInfo(symbol, MODE_BID);
      }
      if (!IsTradeContextBusy()) {
         ticket = OrderSend(
                     symbol,
                     cmd,
                     volume,
                     NormalizeDouble(price, (int)NormalizeDouble(MarketInfo(OrderSymbol(), MODE_DIGITS), 0)),
                     slippage,
                     NormalizeDouble(stoploss, (int)NormalizeDouble(MarketInfo(OrderSymbol(), MODE_DIGITS), 0)),
                     NormalizeDouble(takeprofit,(int)NormalizeDouble(MarketInfo(OrderSymbol(), MODE_DIGITS), 0)),
                     comment,
                     magic,
                     expiration,
                     arrow_color
                  );
         if (ticket > 0) {
            Print("orderSendReliable(): Success! Ticket: " + IntegerToString(ticket));
            return(ticket); // the normal exit
         }

         err = GetLastError();
         if (isTemporaryError(err)) {
            Print("orderSendReliable(): Temporary Error: " + IntegerToString(err) + " " + ErrorDescription(err) + ". waiting.");
         } else {
            Print("orderSendReliable(): Permanent Error: " +  IntegerToString(err) + " " + ErrorDescription(err) + ". giving up.");
            return(-1);
         }
      } else {
         Print("orderSendReliable(): Must wait for trade context");
      }
      Sleep(MathRand() / 10);
   }
}
 
faustf: Hi i have  this part  of  script  , is  a part of common_functions.mqh  , i not underestund a sense  of  this variable  caller  anyone  can explain me ?  thanks  
                     NormalizeDouble(price, (int)NormalizeDouble(MarketInfo(OrderSymbol(), MODE_DIGITS), 0)),
                     slippage,
                     NormalizeDouble(stoploss, (int)NormalizeDouble(MarketInfo(OrderSymbol(), MODE_DIGITS), 0)),
                     NormalizeDouble(takeprofit,(int)NormalizeDouble(MarketInfo(OrderSymbol(), MODE_DIGITS), 0)),

  1. “This variable?” What variable? We can't read your mind.

  2. You used NormalizeDouble, It's use is usually wrong, as it is in your case.

    1. Floating point has an infinite number of decimals, it's you were not understanding floating point and that some numbers can't be represented exactly. (like 1/10.)
                Double-precision floating-point format - Wikipedia, the free encyclopedia

      See also The == operand. - MQL4 programming forum (2013)

    2. Print out your values to the precision you want with DoubleToString - Conversion Functions - MQL4 Reference.

    3. SL/TP (stops) need to be normalized to tick size (not Point) — code fails on non-currencies.
                On 5Digit Broker Stops are only allowed to be placed on full pip values. How to find out in mql? - MQL4 programming forum #10 (2011)

      And abide by the limits Requirements and Limitations in Making Trades - Appendixes - MQL4 Tutorial and that requires understanding floating point equality Can price != price ? - MQL4 programming forum (2012)

    4. Open price for pending orders need to be adjusted. On Currencies, Point == TickSize, so you will get the same answer, but it won't work on non-currencies. So do it right.
                Trailing Bar Entry EA - MQL4 programming forum (2013)
                Bid/Ask: (No Need) to use NormalizeDouble in OrderSend - MQL4 programming forum (2012)

    5. Lot size must also be adjusted to a multiple of LotStep and check against min and max. If that is not a power of 1/10 then NormalizeDouble is wrong. Do it right.
                (MT4 2013)) (MT5 2022))

    6. MathRound() and NormalizeDouble() are rounding in a different way. Make it explicit.
                MT4:NormalizeDouble - MQL5 programming forum (2017)
                How to Normalize - Expert Advisors and Automated Trading - MQL5 programming forum (2017)

    7. Prices you get from the terminal are already correct (normalized).

    8. PIP, Point, or Tick are all different in general.
                What is a TICK? - MQL4 programming forum (2014)

 
William Roeder #:

  1. “This variable?” What variable? We can't read your mind.

  2. You used NormalizeDouble, It's use is usually wrong, as it is in your case.

    1. Floating point has an infinite number of decimals, it's you were not understanding floating point and that some numbers can't be represented exactly. (like 1/10.)
                Double-precision floating-point format - Wikipedia, the free encyclopedia

      See also The == operand. - MQL4 programming forum (2013)

    2. Print out your values to the precision you want with DoubleToString - Conversion Functions - MQL4 Reference.

    3. SL/TP (stops) need to be normalized to tick size (not Point) — code fails on non-currencies.
                On 5Digit Broker Stops are only allowed to be placed on full pip values. How to find out in mql? - MQL4 programming forum #10 (2011)

      And abide by the limits Requirements and Limitations in Making Trades - Appendixes - MQL4 Tutorial and that requires understanding floating point equality Can price != price ? - MQL4 programming forum (2012)

    4. Open price for pending orders need to be adjusted. On Currencies, Point == TickSize, so you will get the same answer, but it won't work on non-currencies. So do it right.
                Trailing Bar Entry EA - MQL4 programming forum (2013)
                Bid/Ask: (No Need) to use NormalizeDouble in OrderSend - MQL4 programming forum (2012)

    5. Lot size must also be adjusted to a multiple of LotStep and check against min and max. If that is not a power of 1/10 then NormalizeDouble is wrong. Do it right.
                (MT4 2013)) (MT5 2022))

    6. MathRound() and NormalizeDouble() are rounding in a different way. Make it explicit.
                MT4:NormalizeDouble - MQL5 programming forum (2017)
                How to Normalize - Expert Advisors and Automated Trading - MQL5 programming forum (2017)

    7. Prices you get from the terminal are already correct (normalized).

    8. PIP, Point, or Tick are all different in general.
                What is a TICK? - MQL4 programming forum (2014)

if read  my code  you can see

  string caller = ""

 
It is used at 
   Print("orderSendReliable(" + … + caller + ")");
Pass whatever you want to see. Most likely __FUNCTION__.
 
thanks,so it's what I thought
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