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 <string>
10// include:intro/start
11#include <immer/map.hpp>
12int main()
13{
14 const auto v0 = immer::map<std::string, int>{};
15 const auto v1 = v0.set("hello", 42);
16 assert(v0["hello"] == 0);
17 assert(v1["hello"] == 42);
18
19 const auto v2 = v1.erase("hello");
20 assert(*v1.find("hello") == 42);
21 assert(!v2.find("hello"));
22}
23// include:intro/end
24