Errors, bugs, questions - page 1369

[TheXpert]

Alexander Laur:
The question is: is arbitrage possible in forex?

))) "and do you believe in dickfix?"

[Ilyas]

A significant argument for the introduction of * (which has not been voiced before) may be the following:

class A { public:
        virtual bool    operator==( A& ) { Print(__FUNCSIG__); return true; }
        virtual bool    operator==( A* ) { Print(__FUNCSIG__); return true; }
};
void today( A *a, A *b )
{
        a == b;            //сравниваются указатели на равенство
        a.operator==( b ); //вызывается a.operator( A* )
//нет синтаксиса вызова a.operator( A& )
}

so one cannot call a.operator( A& ) even explicitly, which is significant

In this case, introduction of * together with making the operation of pointer comparison into a separate function (perhaps a system function) will resolve all the existing ambiguities

void future( A *a, A *b )
{
        a == b;         //вызывается a.operator( A* )
        a == *b;        //вызывается a.operator( A& )
        ::IsEqualPointer( a, b ); //сравниваются указатели на равенство
}

If it was optimal, it will become ideal!

We have added operators *(Dereference/Inderection) and &(Address-of), we are not going to make any additional changes in the language

A *a,*b;

 a== b;   // сравнение "указателей"
*a== b;   // вызов оператора ==(A *)
 a==*b;   // вызов оператора ==(A &)

// для операции != аналогично

// операция & - эквивалент(короткая запись) вызову GetPointer

[Alexey Navoykov]

Ilyas:
Added operators *(Dereference/Inderection) and &(Address-of)

Sweet!

[[Deleted]]

Ilyas:

Added operators *(Dereference/Inderection) and &(Address-of), no additional changes in the language will be made/planned

Is this only in MQL5 or in MQL4, too?

[Ilyas]

Konstantin Karpov:
is this only in MQL5 or has it been added to MQL4 as well?

Added to both languages. Unfortunately, it won't appear in the next build.

[Alexey Navoykov]

I'd like to know about the prospect of introducing property (as a class member). I asked this question recently, but there were no comments from the developers. Is it planned, or should I do a poll on the forum as to whether this feature is needed?

[Ilyas]

Alexey Navoykov:
I'd like to know about the prospect of introducing property (as a class member). I asked this question recently, but there were no comments from the developers. Is this planned, or should I do a poll on the forum as to whether this feature is needed?

This question is under consideration.

[Alexey Navoykov]

Here's another inconvenience. When we try to implement something like this

a.b().c().d();

then after the first pair of parentheses, the auto-substitution list with class member names stops popping up, and all further text has to be typed completely manually/blindly.

[[Deleted]]

Alexey Navoykov:
Here's another inconvenience. When trying to implement something like this:

then after the first pair of parentheses, the auto-substitution list with class member names stops popping up, and all further text has to be typed completely manually/blindly.

It would be nice to add to debugger a hint about type of used variable, like in all advanced IDEs

[A100]

boolFileIsExist( const stringfile_name,//file name intcommon_flag=0// search area ); The file being checked can be a subdirectory. In this case FileIsExist() will return false, and error 5018 will be written to the _LastError variable - "This is not a file, but a directory". (see example for FileFindFirst function).

5018 does not work in subfolders/subdirectories

For example if

and the example https://www.mql5.com/ru/docs/files/filefindfirst would have

input string InpFilter="Dir1\\*"

the result would be

and it should be 1: Directory = Dir2\.