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2013-07-31T23:11:47.437
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2013-07-31T23:11:47.437
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<p>I have created a simple templated class <code>streamable_enum</code> that uses stream operators <code><<</code> and <code>>></code> and is based on the <code>std::map<Enum, std::string></code>: </p> <pre><code>#ifndef STREAMABLE_ENUM_HPP #define STREAMABLE_ENUM_HPP #include <iostream> #include <string> #include <map> template <typename E> class streamable_enum { public: typedef typename std::map<E, std::string> tostr_map_t; typedef typename std::map<std::string, E> fromstr_map_t; streamable_enum() {} streamable_enum(E val) : Val_(val) {} operator E() { return Val_; } bool operator==(const streamable_enum<E>& e) { return this->Val_ == e.Val_; } bool operator==(const E& e) { return this->Val_ == e; } static const tostr_map_t& to_string_map() { static tostr_map_t to_str_(get_enum_strings<E>()); return to_str_; } static const fromstr_map_t& from_string_map() { static fromstr_map_t from_str_(reverse_map(to_string_map())); return from_str_; } private: E Val_; static fromstr_map_t reverse_map(const tostr_map_t& eToS) { fromstr_map_t sToE; for (auto pr : eToS) { sToE.emplace(pr.second, pr.first); } return sToE; } }; template <typename E> streamable_enum<E> stream_enum(E e) { return streamable_enum<E>(e); } template <typename E> typename streamable_enum<E>::tostr_map_t get_enum_strings() { // \todo throw an appropriate exception or display compile error/warning return {}; } template <typename E> std::ostream& operator<<(std::ostream& os, streamable_enum<E> e) { auto& mp = streamable_enum<E>::to_string_map(); auto res = mp.find(e); if (res != mp.end()) { os << res->second; } else { os.setstate(std::ios_base::failbit); } return os; } template <typename E> std::istream& operator>>(std::istream& is, streamable_enum<E>& e) { std::string str; is >> str; if (str.empty()) { is.setstate(std::ios_base::failbit); } auto& mp = streamable_enum<E>::from_string_map(); auto res = mp.find(str); if (res != mp.end()) { e = res->second; } else { is.setstate(std::ios_base::failbit); } return is; } #endif </code></pre> <p>Usage:</p> <pre><code>#include "streamable_enum.hpp" using std::cout; using std::cin; using std::endl; enum Animal { CAT, DOG, TIGER, RABBIT }; template <> streamable_enum<Animal>::tostr_map_t get_enum_strings<Animal>() { return { { CAT, "Cat"}, { DOG, "Dog" }, { TIGER, "Tiger" }, { RABBIT, "Rabbit" } }; } int main(int argc, char* argv []) { cout << "What animal do you want to buy? Our offering:" << endl; for (auto pr : streamable_enum<Animal>::to_string_map()) { // Use from_string_map() and pr.first instead cout << " " << pr.second << endl; // to have them sorted in alphabetical order } streamable_enum<Animal> anim; cin >> anim; if (!cin) { cout << "We don't have such animal here." << endl; } else if (anim == Animal::TIGER) { cout << stream_enum(Animal::TIGER) << " was a joke..." << endl; } else { cout << "Here you are!" << endl; } return 0; } </code></pre>
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1. POEasy way to use variables of enum types as string in C?
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1. USRobert Husák
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