View source for cpp/container/forward list/emplace after

===Example===
{{example
|The example demonstrates a canonical filling of a single-linked list in natural (as opposed to reverse) order.
|code=
#include <forward_list>
#include <iostream>
#include <string>

struct Sum
{
    std::string remark;
    int sum;

    Sum(std::string remark, int sum)
        : remark{std::move(remark)}, sum{sum} {}

    void print() const
    {
        std::cout << remark << " = " << sum << '\n';
    }
};

int main()
{
    std::forward_list<Sum> list;

    auto iter = list.before_begin();
    std::string str{"1"};

    for (int i{1}, sum{1}; i != 10; sum += i)
    {
        iter = list.emplace_after(iter, str, sum);
        ++i;
        str += " + " + std::to_string(i);
    }

    for (const Sum& s : list)
        s.print();
}
|output=
1 = 1
1 + 2 = 3
1 + 2 + 3 = 6
1 + 2 + 3 + 4 = 10
1 + 2 + 3 + 4 + 5 = 15
1 + 2 + 3 + 4 + 5 + 6 = 21
1 + 2 + 3 + 4 + 5 + 6 + 7 = 28
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 = 36
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 45
}}