Errors, bugs, questions - page 2697

[fxsaber]

Stanislav Korotky:

Declaring a class inside a function?

Without templates, it works.

[Sergey Dzyublik]

Bug MT5(build 2375) compilation error when calling a function via its pointer, when an array of pointers to a function is used:

#define  PRINT(x) ; Print(#x, ":", string(x))

void test(){
   PRINT(__FUNCSIG__);
}

template<typename T>
void call(T f_ptr){
   f_ptr();
}


template<typename T>
class A{
public:
   T arr_1[1];
   
   typedef void (*ff)();
   ff arr_2[1];  
   
   
   T test_1(){
      return arr_1[0];
   } 
   
   ff test_2(){
      return arr_2[0];
   } 
   
   T operator[](int index){
      return arr_1[index];
   }
};

void OnStart(){
   typedef void (*ff)();
   ff arr[1];
   arr[0] = test;   
   
   ff f_ptr = arr[0];
   f_ptr();             //Ok
   call(arr[0]);        //Ok
   arr[0]();            //Compile Error: ')' - expression expected   
   
   
   A<ff> a;             
   a.arr_1[0] = test;
   a.arr_2[0] = test;
   
   
   a.arr_1[0]();        //Compile Error: ')' - expression expected   
   a.arr_2[0]();        //Compile Error: ')' - expression expected   
   
   a.test_1()();        //Compile Error: ')' - expression expected   
   a.test_2()();        //Compile Error: ')' - expression expected   
   
   a[0]();              //Ok ???
}

[fxsaber]

Sergey Dzyublik:
MT5(build 2375) bug compilation error when calling a function via its pointer, when an array of pointers to a function is used:

A very ancient bug.

[Aleksey Mavrin]

Any advice - in MetaEditor open file windows, where is their list saved to open them later?

From time to time ME opens from scratch, although before that a bunch of files have been opened. Could be due to updates.

I want to manually back up the list, or maybe some other solution?

[Sergey Dzyublik]

Aleksey Mavrin:

Any advice - in MetaEditor open file windows, where is their list saved to open them later?

From time to time ME opens from scratch, although before that a bunch of files were open. Could be due to updates.

I want to manually back up the list, or maybe some other solution?

There is a list in the registry, there is a list in the ini file "metaeditor.ini" via ME ==> File - Open Data Folder (Ctrl + Shift + D) ==> Config ==> metaeditor.ini
You're more likely to need the second one.

[Sergey Dzyublik]

fxsaber:

A very ancient bug.

I remember for sure that once it worked as it should.
I went to check it and added some more variants of calling pointers to a function from their array.

It turns out that everything works when the array of pointers to a function is inside a class and the specific array element is accessed through operator[].
At the same time, if you use an ordinary function to access an element, a compilation error occurs again... It is a miracle...

[MQL_User]

Is there any way of overriding the automatic rescaling of the indicator? I.e. let's say there are two charts in indicator sub-window, is it possible to make rescaling on vertical axis on one chart and not on the second one? So that the second graph does not affect the rescaling.

[Sergey Dzyublik]

Bug MT5(build 2375), despite explicit specialization when overloaded template function is called, default template function is still called, which leads to stack overflow.
C++ online(https://onlinegdb.com/BJTFdUDD8)

template<typename T>
void test(T &arr[], T value){
    printf("1");
};

template<typename T, typename TT>
void test(T* &arr[], TT* value){
    printf("2");
    test<T*>(arr, value);
};

class A{};

void OnStart(){
   void* arr[] = {};
   A* ptr;
   test(arr, ptr);         // result: 2,2,2,2,2,2,2,2,...    should be: 2, 1
}

[prostotrader]

bool s_sel = SymbolSelect("", true);

s_sel = true;

Correct this, please.

[fxsaber]

The tooltip gives only one ENUM value.