Question

How to insert an element at the beginning of deque forward_list in C++

Answer 1

#include <iostream>
#include <forward_list>

void print( std::forward_list<int> fl) {
    for (int &n : fl) std::cout << n << ", ";
    
    std::cout << "\n";
}

int main() {
    std::forward_list<int> fl = {2, 5, 32, 9, 8, 7};

    print(fl);
    
    fl.insert_after(fl.before_begin(), 10);
    
    print(fl);
}



/*
run:

2, 5, 32, 9, 8, 7, 
10, 2, 5, 32, 9, 8, 7, 

*/

 

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