cpp-transformations's Introduction

C++ Transformations

Map, Reduce and Filter operations for standard C++ containers

Note: This is a fork that tries to parallelize the tranforms using OpenMP. You can find more details on my blog post.

You can find the original repo here.

Map

Example:

#include<iostream>
#include<vector>
#include "transform.hpp"

int multiplyByTwo(int i){
    return i*2;
}

int main(){
    std::vector<int> arr{1,2,3,4,5};
    for(auto i:arr){
        std::cout<<i<<" ";
    }
    std::cout<<std::endl;
    auto new_arr = transform::map<int,std::vector<int>>(arr, multiplyByTwo);
    for(auto i:new_arr){
        std::cout<<i<<" ";
    }
    std::cout<<std::endl;
    return 0;
}

Output:

1 2 3 4 5
2 4 6 8 10

Reduce

Example:

#include<iostream>
#include<vector>
#include "transform.hpp"

int multiplyByTwo(int i){
    return i*2;
}

int main(){
    std::vector<int> arr{1,2,3,4,5};
    for(auto i:arr){
        std::cout<<i<<" ";
    }
    std::cout<<std::endl;
    auto val = transform::reduce<int,std::vector<int>>(arr, multiplyByTwo, 0);
    std::cout<<val<<std::endl;
    return 0;
}

Output:

1 2 3 4 5
30

Filter

Example:

#include<iostream>
#include<vector>
#include "transform.hpp"

bool divisibleByTwo(int i){
    return i%2==0;
}

int main(){
    std::vector<int> arr{1,2,3,4,5,6};
    for(auto i:arr){
        std::cout<<i<<" ";
    }
    std::cout<<std::endl;
    auto new_arr = transform::filter<int,std::vector<int>>(arr, divisibleByTwo);
    for(auto i:new_arr){
        std::cout<<i<<" ";
    }
    std::cout<<std::endl;
    return 0;
}