using c++17 in mql5
using c++17 in mql5
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H.M · External communityPost link
External question — Stack Overflow Stack Exchange
Author: H.M
Original post: https://stackoverflow.com/questions/72839931
License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/
Adaptation: HTML converted to plain text; contact email addresses removed.
Recently I want use all new features of c++(<=c++17) in MQL5 , Or using c++ stl containers , like std::map , std::vector.
I can do something like this:
creating a wrapper on them and compile them , hence using dll in mql5
But it's so bad idea , Can anyone suggest better way? thx for answer.
I know that features like
template overloading
and more features should be suppoerted by meta trader code base , but they are so slow in this way , I wanna use new features in indirect way now, if it's possible.
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TheLegs · External communityPost link
External answer — Stack Overflow Stack Exchange
Author: TheLegs
Original post: https://stackoverflow.com/a/79950469
License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/
Adaptation: HTML converted to plain text; contact email addresses removed.
If the goal is to use the functionalities, not the exact same syntax, then MQL5 has two things that might be of interest:
Matrices and vectors are available natively
, plus
There is a
Standard Library
available, which includes hashmaps and queues.
For example:
#include <Generic\HashMap.mqh>
class RunResults
{
public:
double p[20];
double label[20];
};
CHashMap<uint, RunResults*> runs;
template<typename T>
double CalculateLoss(const T &p[], const T &label[])
{
static vector<T> vp;
vp.Assign(p);
static vector<T> vl;
vl.Assign(label);
return vp.Loss(vl, LOSS_MSE);
}
double GetRunLoss(uint runId)
{
static RunResults* value;
if(runs.TryGetValue(runId, value))
return CalculateLoss(value.p, value.label);
else
return NULL;
}
This comment on the MQL5 forum
collects some more differences, with the caveat that some of these differences have been resolved in recent years.
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Quoted from Forex.com.bd-Editorial External answer — Stack Overflow Stack Exchange Author: TheLegs Source score (net votes, not local likes): 0 Original post: https://stackoverflow.com/a/79950469 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. If the goal is to use the functionalities, not the exact same syntax, then MQL5 has two things that might be of interest: Matrices and vectors are available natively , plus There is a Standard Library available, which includes hashmaps and queues. For example: #include <Generic\HashMap.mqh> class RunResults { public: double p[20]; double label[20]; }; CHashMap<uint, RunResults*> runs; template<typename T> double CalculateLoss(const T &p[], const T &label[]) { static vector<T> vp; vp.Assign(p); static vector<T> vl; vl.Assign(label); return vp.Loss(vl, LOSS_MSE); } double GetRunLoss(uint runId) { static RunResults* value; if(runs.TryGetValue(runId, value)) return CalculateLoss(value.p, value.label); else return NULL; } This comment on the MQL5 forum collects some more differences, with the caveat that some of these differences have been resolved in recent years.
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