CODEWITHSUNDEEP
c++stdmapstd-pair
yokeshrana
yokeshrana

Reputation: 29

How to access in map having a pair inside it

I am using the map with pair inside it, but not able to figure out how to access with iterator of map

my map declaration

  map<ll,pair<ll,ll> > val;
  map<ll,pair<ll,ll> > ::iterator it;

What i am using for accessing inserted values is 

   cout<<it->first<<" " <<it->second->first<<" " <<it->second->second<<endl;

But the compiler is showing this error

error: base operand of '->' has non-pointer type 'std::pair<long long unsigned int, long long unsigned int>'|

Upvotes: 2

Views: 5806

Answers (3)

user2937812
user2937812

Reputation: 49

You can also return pair values together.

map<ll,pair<ll,ll> > val;

auto [pair_first_element,pair_second_element]=val[key_value];

Upvotes: 1

Zeynep Akkalyoncu
Zeynep Akkalyoncu

Reputation: 885

Use -> to access the element pointed to by a pointer and a . to access a member variable. In this case, map is a container and pair a struct so you have to access the elements of both with ..

cout << it->first << " " << it->second.first << " " << it->second.second << endl;

Upvotes: 1

John Kugelman
John Kugelman

Reputation: 362187

Use . to access the elements of a pair.

cout<<it->first<<" " <<it->second.first<<" " <<it->second.second<<endl;

Upvotes: 3

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