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

4 years ago by vishaljlf39

2 Answers

Login / Signup to Answer the Question.

Login Signup

**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);

C TUTORIAL

C PROGRAMS

INTERVIEW TESTS

EXECUTE CODE

C++ TUTORIAL

C++ PROGRAMS

INTERVIEW TESTS

EXECUTE CODE

PYTHON TUTORIAL

PYTHON HOW TOS

INTERVIEW TESTS

EXECUTE CODE

JAVA TUTORIAL

JAVA CODE EXAMPLES

SPRING TUTORIAL

MORE IN JAVA

COMPUTER ARCHITECTURE

COMPUTER NETWORK

OPERATING SYSTEM

DBMS & SQL

PL/SQL

MongoDB

EXECUTE SQL

ANDROID DEVELOPMENT

GO LANGUAGE

LINUX

DOCKER

HTML TAGS (A to Z)

CSS REFERENCES

SASS/SCSS

KOTLIN

GAME DEVELOPMENT

PHP

GIT GUIDE

JAVASCRIPT

ADVANCED DSA

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

2 Answers

Login / Signup to Answer the Question.