Boost C++ Application Development Cookbook - Second Edition

How to do it...

This will be the simplest of all recipes:

1. All you need to do is just include the <boost/unordered_map.hpp> header, if you wish to use maps. If we wish to use sets, include the <boost/unordered_set.hpp> header.
2. Now, you are free to use boost::unordered_map instead of std::map and boost::unordered_set instead of std::set:

#include <boost/unordered_set.hpp>#include <string>#include <cassert>void example() {    boost::unordered_set<std::string> strings;    strings.insert("This");    strings.insert("is");    strings.insert("an");    strings.insert("example");    assert(strings.find("is") != strings.cend());}