CODEWITHSUNDEEP
c++boostvariantboost-variant
H'H
H'H

Reputation: 1678

filter a vector of boost variant into a new vector?

I am looking for the best way to filter a vector of the boost variant which has been defined like this:

 boost::variant<T1*, T2, T3> Var;
 std::vector<Var> Vec;

when I call this vector, what is the best way to filter only T2 bounded type and insert into new vector? or in other way, I want something like this 

std::vector<T2> T2Vec = ...(how to filter it from Vec)....

thank you!

EDIT: Since using a "visitor" is more robust, I'm also wondering of anyone could give me a solution using "visitor"?

thanks again!

Upvotes: 2

Views: 689

Answers (1)

juanchopanza
juanchopanza

Reputation: 227370

The simplest solution would be to loop over Vec, checking if the element is a double, then push the double into a T2Vec. This is a C++03 version:

for (std::vector<Var>::const_iterator it = Vec.begin(); it != Vec.end(); ++it)
{
  if (it->which() == 1) T2Vec.push_back(boost::get<T2>(*it));
}

C++11 version:

for (const auto& v : Vec)
{
  if (v.which() == 1) T2Vec.push_back(boost::get<T2>(v));
}

Upvotes: 4

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