maps.cpp
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	#include <iostream>
	#include <map>

	enum ParticleType {
	planet,
	star,
	atom,
	};

	int main() {
	std::map<std::string, ParticleType> particle_types;

	particle_types["mars"] = planet;
	particle_types["sun"] = star;
	particle_types["copper"] = atom;

	std::map<std::string, ParticleType>::iterator it = particle_types.begin();
	std::map<std::string, ParticleType>::iterator end = particle_types.end();

	for (; it != end; ++it) {
	std::string key = it->first;
	ParticleType p_type = it->second;

	std::cout << "key:" << key << " -> ";
	std::cout << p_type << std::endl;
	}
	}