std::move_iterator

#include <algorithm>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <ranges>
#include <string>
#include <string_view>
#include <vector>
 
void print(const std::string_view rem, const auto& v)
{
 std::cout << rem;
 for (const auto& s : v)
 std::cout << std::quoted (s) << ' ';
 std::cout << '\n';
};
 
int main()
{
 std::vector <std::string > v{"this", "_", "is", "_", "an", "_", "example"};
 print("Old contents of the vector: ", v);
 std::string concat;
 for (auto begin = std::make_move_iterator (v.begin()),
 end = std::make_move_iterator (v.end());
 begin != end; ++begin)
 {
 std::string temp{*begin}; // moves the contents of *begin to temp
 concat += temp;
 }
 
 // Starting from C++17, which introduced class template argument deduction,
 // the constructor of std::move_iterator can be used directly:
 // std::string concat = std::accumulate(std::move_iterator(v.begin()),
 // std::move_iterator(v.end()),
 // std::string());
 
 print("New contents of the vector: ", v);
 print("Concatenated as string: ", std::ranges::single_view (concat));
}

Old contents of the vector: "this" "_" "is" "_" "an" "_" "example"
New contents of the vector: "" "" "" "" "" "" ""
Concatenated as string: "this_is_an_example"