C++ Vector emplace_back() function

C++ Vector emplace_back() function tutorial for beginners and professionals with examples on assign(), at(), back(), begin(), capacity(), cbegin(), cend(), clear(), crbegin(), crend(), data(), emplace(), end(), front(), rbegin(), resize(), size(), swap() etc.

<< Back to CPP

next → ← prev

C++ emplace_back()

This function is used to insert new element at the end of the vector and increases the size of the vector container.

Syntax

Consider a vector 'v'. Syntax would be :

v.emplace_back(args);

Parameter

args: Arguments forwarded to construct the new element.

Return value

It does not return any value.

Example 1

Let's see a simple example.

#include <iostream>
#include<vector>
using namespace std;
int main()
{
vector<char> v{'C','+'};
v.emplace_back('+');
for(int i=0;i<v.size();i++)
cout<<v[i];
return 0;
}

Output:

C++

In this example, size of the vector 'v' increases by adding new character value at the end of the vector using emplace_back() function.

emplace() vs insert()

insert() function is used to copy the objects into the vector while emplace() function is used to construct them inside the vector only thus it avoids unnecessary operations to be performed.

Example 2

Let's see another simple example.

#include <iostream>
#include<vector>
using namespace std;
int main()
{
vector<int> v{1,2,3,4,5};
v.emplace_back(6);
for(int i=0;i<v.size();i++)
cout<<v[i]<<" ";
return 0;
}

Output:

1 2 3 4 5 6

In this example, emplace_back() function is used to add new integer value at the end of the vector i.e after the last element.

Next TopicC++ Vector

← prev next →

.Net

.NET Array Dictionary List String 2D Async DataTable Dates DateTime Enum File For Foreach Format IEnumerable If IndexOf Lambda LINQ Parse Path Process Property Regex Replace Sort Split Static StringBuilder Substring Switch Tuple

Java

Core Array ArrayList HashMap String 2D Cast Character Console Deque Duplicates File For Format HashSet If IndexOf Lambda Math ParseInt Process Random Regex Replace Sort Split StringBuilder Substring Switch Vector While

Related Links

Adjectives Ado Ai Android Angular Antonyms Apache Articles Asp Autocad Automata Aws Azure Basic Binary Bitcoin Blockchain C Cassandra Change Coa Computer Control Cpp Create Creating C-Sharp Cyber Daa Data Dbms Deletion Devops Difference Discrete Es6 Ethical Examples Features Firebase Flutter Fs Git Go Hbase History Hive Hiveql How Html Idioms Insertion Installing Ios Java Joomla Js Kafka Kali Laravel Logical Machine Matlab Matrix Mongodb Mysql One Opencv Oracle Ordering Os Pandas Php Pig Pl Postgresql Powershell Prepositions Program Python React Ruby Scala Selecting Selenium Sentence Seo Sharepoint Software Spellings Spotting Spring Sql Sqlite Sqoop Svn Swift Synonyms Talend Testng Types Uml Unity Vbnet Verbal Webdriver What Wpf

TheDeveloperBlog.com