std::equal_range for structs

[sitesv]

Hi!

stuct mystuct{
  int a;
  int b;
  int c;
};
 
std::vector<mystruct> mylist;
 
auto range = std::equal_range(mylist.begin(), mylist.end(), ....);

How to get stucts with b = 2 ?

[KroMignon]

@sitesv said in std::equal_range for structs:

How to get stucts with b = 2 ?

Why do you not use std::find_if()?:

stuct mystuct{
  int a;
  int b;
  int c;
};
 
std::vector<mystruct> mylist;

auto filter = [](const mystuct& s) { return s.b == 2; };
auto iter = std::find_if(mylist.begin(), mylist.end(), filter);
while(iter != mylist.end())
{
   // do stuff with *iter

   // search next
   iter = std::find_if(std::next(iter), mylist.end(), filter);
}

[Christian Ehrlicher]

Don't see any relation to Qt here. The cppreference documentation has an example which matches exactly your problem.

[sitesv]

Is it possible to use equal_range with vector of pointers?
I need to edit vector elements in runtime... Example from doc is not working in this case cause of 'const'....

[SGaist]

@sitesv said in std::equal_range for structs:

Is it possible to use equal_range with vector of pointers?

Yes it is, but you will have to provide the comparison function yourself.

It's all shown in the documentation that @Christian-Ehrlicher linked to.