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ADT in C++. Based on https://dev.to/tmr232/that-overloaded-trick-overloading-lambdas-in-c17
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| template<class... Ts> struct overloaded : Ts... { using Ts::operator()...; }; | |
| template<class... Ts> overloaded(Ts...) -> overloaded<Ts...>; | |
| template<class Variant, class... Ts> | |
| auto match(Variant v, Ts... matchers) { | |
| return visit(overloaded{matchers...}, v); | |
| } | |
| struct Human {string name; int age;}; | |
| struct Animal {string kind; int age;}; | |
| using Species = variant<Human, Animal>; | |
| int main() { | |
| Species species = Human{"John", 100}; | |
| // example 1 | |
| visit( | |
| overloaded{ | |
| [](Human const & human) { | |
| cout << "Human name: " << human.name << endl; | |
| }, | |
| [](Animal const & animal) { | |
| cout << "Animal kind: " << animal.kind << endl; | |
| }, | |
| }, | |
| species | |
| ); | |
| // example 2 | |
| match( | |
| species, | |
| [](Human const & human) { | |
| cout << "Human name: " << human.name << endl; | |
| }, | |
| [](Animal const & animal) { | |
| cout << "Animal kind: " << animal.kind << endl; | |
| } | |
| ); | |
| // example 3 | |
| cout | |
| << match( | |
| species, | |
| [](Human human ){return "Human name: " + human .name;}, | |
| [](Animal animal){return "Animal kind: " + animal.kind;} | |
| ) | |
| << endl; | |
| } |
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