1//
2// immer: immutable data structures for C++
3// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
4//
5// This software is distributed under the Boost Software License, Version 1.0.
6// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
7//
8
9#include <immer/box.hpp>
10#include <cassert>
11#include <string>
12
13int main()
14{
15 {
16// include:update/start
17 auto v1 = immer::box<std::string>{"hello"};
18 auto v2 = v1.update([&] (auto l) {
19 return l + ", world!";
20 });
21
22 assert((v1 == immer::box<std::string>{"hello"}));
23 assert((v2 == immer::box<std::string>{"hello, world!"}));
24// include:update/end
25 }
26}
27