How to sort vector of strings in specific template order?

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The problem: I need to sort a vector of strings in exact specific order. Let say we have a constant vector or a array with the exact order:

vector<string> correctOrder = {"Item3", "Item1", "Item5", "Item4", "Item2"}; 

Next we have a dynamic incoming vector which will have same Items, but they maybe mixed and less in number.

vector<string> incommingVector = {"Item1", "Item5", "Item3"}; 

So I need to sort the incommingVector with the order like first vector and the result must be:

vector<string> sortedVector = {"Item3", "Item1", "Item5"}; 

I think the correct order may be represent different way, but cant figure out. Can someone help me please.

 


You can create your own functor to sort your vector in template vector order as explained by below code :

#include <iostream> #include <string> #include <vector> #include <algorithm> using namespace std; struct MyComparator {     //static const int x = 9;   const std::vector<std::string> correctOrder{"Item1", "Item2", "Item3", "Item4", "Item5"};   bool operator() (const std::string& first,const std::string& second )   {       auto firstitr = std::find(correctOrder.begin(),correctOrder.end(),first);       auto seconditr = std::find(correctOrder.begin(),correctOrder.end(),second);       return firstitr < seconditr;   } }; void printVector(const std::vector<std::string>& input) {     for(const auto&elem:input)     {         std::cout<<elem<<" , ";     }     std::cout<<std::endl; } int main() {   std::vector<string> incomingVector = {"Item3", "Item5", "Item1"};   std::cout<<"vector before sort... "<<std::endl;   printVector(incomingVector);   std::sort(incomingVector.begin(),incomingVector.end(),MyComparator());   std::cout<<"vector after sort...."<<std::endl;   printVector(incomingVector);   return 0; } 

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