snippetcppCritical
How to find out if an item is present in a std::vector?
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howfindstdvectoroutpresentitem
Problem
All I want to do is to check whether an element exists in the vector or not, so I can deal with each case.
if ( item_present )
do_this();
else
do_that();Solution
You can use
This returns an iterator to the first element found. If not present, it returns an iterator to one-past-the-last. With your example:
std::find from ``:#include
#include
vector 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 an iterator to the first element found. If not present, it returns an iterator to one-past-the-last. With your example:
#include
#include
if ( std::find(vec.begin(), vec.end(), item) != vec.end() )
do_this();
else
do_that();Code Snippets
#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()#include <algorithm>
#include <vector>
if ( std::find(vec.begin(), vec.end(), item) != vec.end() )
do_this();
else
do_that();Context
Stack Overflow Q#571394, score: 1251
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