Hurrricane:
Error:
'_Symbol' - constant expected.
Can someone explain why I can't assigning it as a default value?
Because _Symbol is not a constant.
Formal parameters can be initialized by constants. In this case, the initializing value is considered as the default value. Parameters, next to the initialized one, must also be initialized.
Hurrricane:
Error:
'_Symbol' - constant expected.
Can someone explain why I can't assigning it as a default value?
A workaround could be something like this:
long positionType(string symbol = "") { symbol = (symbol == "")? _Symbol : symbol; ...

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Error:
'_Symbol' - constant expected.
Can someone explain why I can't assigning it as a default value?