Browse vector with std::vector >

Question

I have the following vector:

std::vector< std::pair<std::string,bool > > myvec;

How can i browse and print elements of my vector with iterators?

ForEveR · Accepted Answer · 2012-08-10T18:33:24.927

7

What is your problem?

typedef std::vector<std::pair<std::string, bool> > vector_type;
for (vector_type::const_iterator pos = myvec.begin();
     pos != myvec.end(); ++pos)
{
   std::cout << pos->first << " " << pos->second << std::endl;
}

or you can use std::for_each with some functor.

edited Aug 10 '12 at 18:33

answered Aug 10 '12 at 18:25

ForEveR

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The overload won't work: both of the operand types are in the `std` namespace, so the overload would need to be placed in the `std` namespace. But, you aren't allowed to declare overloads in the `std` namespace. – James McNellis Aug 10 '12 at 18:29
You defined `typedef` as `vector` and defined `const_iterator` When i changed my code same you i get error, Because i'm using `find_if`. – PersianGulf Aug 10 '12 at 18:34

score 2 · Answer 2 · answered Aug 10 '12 at 18:26

Create iterator, pointing to the first element of the vector (syntax: Container::iterator iter = myContainer.begin())
in a for-loop, iterate through all elements ( iterator has operator++; the end condition is - check if the iterator has reached the end of your container, like: iter != myContainer.end())
Iterators are like pointers, to reach it's members, use operator->.
std::pair is like a struct with two fields - first and second, so you can print a vector's element like: iter->first and iter->second.

Browse vector with std::vector >

2 Answers2