Errors, bugs, questions - page 2144

[fxsaber]

How can I make it so that when the custom character's History is changed, it is tucked away by the Agent, rather than being taken by the Agent from its irrelevant repository?

[fxsaber]

Is this a language bug?

struct STRUCT
{
  template <typename T>
  void operator =( const T ) const {}

  template <typename T>
  void operator =( const T &Value ) const {} // Ошибка исчезает, если убрать любой const
};

void OnStart()
{
  STRUCT a;
  const int i = 0;
  
  a = i; // Ошибка: 'operator=' - object required
}

[A100]

fxsaber:
Is it a bug in the language?

In this form C++ also gives error E2015

And if you write it this way:

template<typename T> void f( T& ) {}
template<typename T> void f( T  ) {}
void OnStart()
{
    const int i = 0;
    f( i );
}

MQL compiles without errors, but C++ reports error E2015

[fxsaber]

Is it true that SymbolInfoTick in MT4/5 indicators does not return the tick that triggered the Calculate event?

If so, it's not quite clear what the tick collectors via indicators are based on?

[Slava]

fxsaber:

Is it true that SymbolInfoTick in MT4/5 indicators does not return the tick that triggered the Calculate event?

As a rule, it is the same tick.

You are formulating your questions in a very strange way.

- Any question can be answered yes or no!

- How long ago did you stop drinking cognac in the morning? Answer now, yes or no?

(c) Astrid Lindgren

[fxsaber]

Slava:

This is usually the same tick.

If a pack of three ticks arrives, the Calculate event will be called three times, but SymbolInfoTick will return the latest tick on each of these three calls. I.e. the so-called collection of ticks without passing through indicators is questionable, to put it mildly.

[Ivan Titov]

Why after setting CustomSymbolSetDouble(symbol, SYMBOL_VOLUME_MIN, 0.00035) and CustomSymbolSetDouble(symbol, SYMBOL_VOLUME_STEP, 0.00035) function SymbolInfoDouble(symbol, SYMBOL_VOLUME_MIN) returns 0.0003 and SymbolInfoDouble(symbol, SYMBOL_VOLUME_STEP) returns 0.01?

[fxsaber]

A very unpleasant bug with custom characters. The tick history of the custom characters can completely disappear.

I've encountered this a few times already. Not doing any custom entries. Only working on reading ticks. And at a certain moment, all of a sudden, the entire history disappears. CopyTicks returns zeros without errors. Using GUI tools, the same thing. tkc becomes 1 Kb, while it used to be several million ticks.

So I can't trust MT5 to store my ticks, because it may delete them during one of my reads.

[fxsaber]

Ivan Titov:
Why after setting CustomSymbolSetDouble(symbol, SYMBOL_VOLUME_MIN, 0.00035) and CustomSymbolSetDouble(symbol, SYMBOL_VOLUME_STEP, 0.00035) function SymbolInfoDouble(symbol, SYMBOL_VOLUME_MIN) returns 0.0003 and SymbolInfoDouble(symbol, SYMBOL_VOLUME_STEP) returns 0.01?

Even with the GUI, you can't set these values

[TheXpert]

A100:

In this form, C++ also gives error E2015

E2015 is an ambiguity.

And in the fxsaber example it looks like there is a non-constant operator generated by the compiler (with an object in parameters) and it is selected.

This is because the assignment operator should not be constant

(imho)