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C++ || How To Merge & Concatenate Two Vectors Using C++

December 07, 2020 admin No comments

The following is a module with functions which demonstrates how to merge, concatenate and append two vectors using C++.

The function demonstrated on this page is a template, so it should work on vectors of any type.

1. Add Range

The example below demonstrates the use of ‘Utils::addRange‘ add elements to the end of the collection.





		
		
			1. Add Range
			
C++
			
			// Add Range

// Declare vector
std::vector<std::string> names = {"Kenneth"};

// Add more names
Utils::addRange(names, {"Jennifer", "Lynn", "Sole"});

// Display results
for (const auto& name : names) {
    std::cout << "Name: " + name << std::endl;
}

// expected output:
/*
    Name: Kenneth
    Name: Jennifer
    Name: Lynn
    Name: Sole
*/
			
				
					
				
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						// Add Range
 
// Declare vector
std::vector<std::string> names = {"Kenneth"};
 
// Add more names
Utils::addRange(names, {"Jennifer", "Lynn", "Sole"});
 
// Display results
for (const auto& name : names) {
    std::cout << "Name: " + name << std::endl;
}
 
// expected output:
/*
    Name: Kenneth
    Name: Jennifer
    Name: Lynn
    Name: Sole
*/

2. Utils Namespace

The following is the Utils Namespace. Include this in your project to start using!





		
		
			Utils Namespace
			
C++
			
			// ============================================================================
//    Author: Kenneth Perkins
//    Date:   Dec 7, 2020
//    Taken From: http://programmingnotes.org/
//    File:  Utils.h
//    Description: Handles general utility functions
// ============================================================================
#pragma once
#include <vector>
#include <iterator>

namespace Utils {
    /**
    * FUNCTION: addRange 
    * USE: Adds elements to the end of the collection
    * @param source: The collection that will have items added to it
    * @param addition: The items that should be added to the end of the collection
    * @return: N/A
    */
    template<typename T>
    void addRange(std::vector<T>& source, const std::vector<T>& addition) {
        source.reserve(source.size() + addition.size());
        source.insert(source.end() 
            , std::make_move_iterator(addition.begin())
            , std::make_move_iterator(addition.end()));
    }
}// http://programmingnotes.org/
			
				
					
				
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						// ============================================================================
//    Author: Kenneth Perkins
//    Date:   Dec 7, 2020
//    Taken From: http://programmingnotes.org/
//    File:  Utils.h
//    Description: Handles general utility functions
// ============================================================================
#pragma once
#include <vector>
#include <iterator>
 
namespace Utils {
    /**
    * FUNCTION: addRange 
    * USE: Adds elements to the end of the collection
    * @param source: The collection that will have items added to it
    * @param addition: The items that should be added to the end of the collection
    * @return: N/A
    */
    template<typename T>
    void addRange(std::vector<T>& source, const std::vector<T>& addition) {
        source.reserve(source.size() + addition.size());
        source.insert(source.end() 
            , std::make_move_iterator(addition.begin())
            , std::make_move_iterator(addition.end()));
    }
}// http://programmingnotes.org/

3. More Examples

Below are more examples demonstrating the use of the ‘Utils‘ Namespace. Don’t forget to include the module when running the examples!





		
		
			More Examples
			
C++
			
			// ============================================================================
//    Author: Kenneth Perkins
//    Date:   Dec 7, 2020
//    Taken From: http://programmingnotes.org/
//    File:  program.cpp
//    Description: The following demonstrates the use of the Utils Namespace
// ============================================================================
#include <iostream>
#include <string>
#include <exception>
#include <vector>
#include "Utils.h"

void display(const std::string& message);

int main() {
    try {
        // Declare vector
        std::vector<std::string> names = {"Kenneth"};

        // Add more names
        Utils::addRange(names, {"Jennifer", "Lynn", "Sole"});

        // Display results
        for (const auto& name : names) {
            display("Name: " + name);
        }
    } catch (std::exception& e) {
        display("\nAn error occurred: " + std::string(e.what()));
    }

    std::cin.get();
    return 0;
}

void display(const std::string& message) {
    std::cout << message << std::endl;
}// http://programmingnotes.org/
			
				
					
				
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						// ============================================================================
//    Author: Kenneth Perkins
//    Date:   Dec 7, 2020
//    Taken From: http://programmingnotes.org/
//    File:  program.cpp
//    Description: The following demonstrates the use of the Utils Namespace
// ============================================================================
#include <iostream>
#include <string>
#include <exception>
#include <vector>
#include "Utils.h"
 
void display(const std::string& message);
 
int main() {
    try {
        // Declare vector
        std::vector<std::string> names = {"Kenneth"};
 
        // Add more names
        Utils::addRange(names, {"Jennifer", "Lynn", "Sole"});
 
        // Display results
        for (const auto& name : names) {
            display("Name: " + name);
        }
    } catch (std::exception& e) {
        display("\nAn error occurred: " + std::string(e.what()));
    }
 
    std::cin.get();
    return 0;
}
 
void display(const std::string& message) {
    std::cout << message << std::endl;
}// http://programmingnotes.org/

QUICK NOTES:
The highlighted lines are sections of interest to look out for.

The code is heavily commented, so no further insight is necessary. If you have any questions, feel free to leave a comment below.

Tag Archives: merge

C++ || How To Merge & Concatenate Two Vectors Using C++

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