Errors, bugs, questions - page 2660

[fxsaber]

Igor Makanu:

need an ID - local agent in the tester, not sure why there is no such functionality

TerminalInfoString(TERMINAL_DATA_PATH);

[Aleksey Mavrin]

I would like to repeat this, so as not to get lost in randomness)

1. Please advise if I open chart ChartOpen(), then how can I return focus (activity, visibility) on my chart, from which my EA works, without closing it.

2. Who knows why Bid, Ask does not coincide with chart price Close[0]https://www.mql5.com/ru/forum/160683/page1082#comment_15152111

[Igor Makanu]

fxsaber:

Yeah, I was looking for that, I didn't think it was the place to look

That's how you get an agent's number.

string path = TerminalInfoString(TERMINAL_DATA_PATH);
string agent = StringSubstr(path,StringLen(path)-4);

[Sergey Dzyublik]

MT5 bug (build 2342) compilation error when calling a template function with explicit argument types, when called from an overloaded non-template function.

template<typename T>
class B{
public:
   void func(const T value){
      printf("1\r\n");
      func<T>(value);             //'func<int>' - ambiguous call to overloaded function with the same parameters        
   };
   
   template<typename TT>
   void func(const TT){
      printf("2\r\n");
   };
   
};


void OnStart(){
   B<int> b;
   b.func(1);
   b.func(1.1);
}

[Sergey Dzyublik]

Bug MT5 (build 2342) generates a compilation error when generating code for a template function even though there is an overloaded template function with a suitable signature for the parameters passed.
C++ online:https://onlinegdb.com/HyxjmV-DVI

#ifdef __cplusplus
    #include <iostream>
#endif


class C{
public:
   struct A{
      char aaa;
   };
   
   template<typename T>
   void test(A&, T&, T&, void* = NULL){
      printf("1");
   }
   
   template<typename T>
   void test(T&, T&, T&){
      printf("2");
   }
};

struct B : public C::A{
   char data;
};

struct D{
   char data;
};


void OnStart(){
   C c;

   B b;
   D d;
   
   c.test(b, b, b);    // should be: 2       
   c.test(b, d, d);    // should be: 1       //Compile Error: template parameter ambiguous, could be 'B' or 'D'
}

int main(){
   OnStart();
   return 0;
}

[Alain Verleyen]

Sergey Dzyublik :

Bug MT5 (build 2342) generates a compilation error when generating code for a template function even though there is an overloaded template function with a suitable signature for the parameters passed.
C++ online: https://onlinegdb.com/HyxjmV-DVI

Have you ever heard back from Metaquotes about all the hard test work you do?

[fxsaber]

Forum on trading, automated trading systems and trading strategy testing

Bugs, bugs, questions

Sergey Dzyublik, 2020.02.28 22:21

class C{
public:
   struct A{
      char aaa;
   };
};

struct B : public C::A{
   char data;
};

I have never implemented this feature, thank you.

[Sergey Dzyublik]

Alain Verleyen:
Have you ever heard back from Metaquotes about all the hard test work you do?

Yes and no.
No complaints on my part, but a good word never hurts.

[Sergey Dzyublik]

There is no way to solve the following problem:
How to get "partial specialisation" for test function to distinguish transferred parameters and execute different algorithm in each case?
I will be glad to help, thank you.

C++ online with expected behaviour(https://onlinegdb.com/rycNVNDN8).

class C{
public:
   struct A{
   public:
      char aaa;
      
      A (char value = 0) : aaa(value){}
      void set(char value){
         aaa = value; 
      };
      char get(){return aaa;}
   };
   
   void test(A&, A& a1, A& a2){
      printf("1");
      a1.aaa = a2.aaa;
   }
   
   template<typename T>
   void test(A&, T& d1, T& d2){
      printf("2");
      d1.set(d2.get());
   }
};

struct B : public C::A{};


struct D{
private:
   char data;
public:  
   D(char value = 0) : data(value){}
   void set(char value){
      data = value; 
   };
   char get(){return data;}
};


void OnStart(){
   C c;

   B b;
   D d;
   
   c.test(b, b, b);    // 2      should be: 1
   c.test(b, d, d);    // 2      should be: 2   
}

[Nikolai Semko]

Sergey Dzyublik:
There is no way to solve the following problem:
How to get "partial specialisation" for test function to distinguish transferred parameters and execute different algorithm in each case?
I will be glad to help, thank you.

class C{
public:
   struct A{
      char aaa;
   };
   
   /*void test(A&, A&, A&){
      printf("1");
   }*/
   
   template<typename T>
   void test(A&, T&, T&){
      if (sizeof(T)==sizeof(A)) printf("1");
      else                      printf("2");
   }
};

struct B : public C::A{
   char data;
};

struct D{
   char data;
};


void OnStart(){
   C c;

   B b;
   D d;
   
   c.test(b, b, b);    // 2      should be: 2 
   c.test(b, d, d);    // 1      should be: 1    
}