How to find out if an item is present in a std::vector?

Question

How to find out if an item is present in a std::vector?

All I need to do is to check if an element exists in the vector, so I can manage each case.

if ( item_present )

   do_this();

else

   do_that();

std vector cpp

3 years ago by vishaljlf39

2 Answers

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**akshay1995** · Answer 1 · 2021-05-29T08:49:57

You can use std::find from <algorithm>:



#include <algorithm>

#include <vector>

vector<int> vec; 

//can have other data types instead of int but must same datatype as item 

std::find(vec.begin(), vec.end(), item) != vec.end()

This returns a bool (true if present, false otherwise). With your example:



#include <algorithm>

#include <vector>



if ( std::find(vec.begin(), vec.end(), item) != vec.end() )

   do_this();

else

   do_that();

**kshitijrana14** · Answer 2 · 2021-05-31T15:29:40

With boost you can use any_of_equal:

#include <boost/algorithm/cxx11/any_of.hpp>

bool item_present = boost::algorithm::any_of_equal(vector, element);

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How to find out if an item is present in a std::vector?

2 Answers

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