How to create a vector of objects that share a concept?

4

I want to create a vector (or array) of objects of different types but all sharing the same concept.
similar to Vec<Box<dyn trait>> of Rust.

struct Dog {
    void talk() {
        std::cout << "guau guau" << std::endl;
    }
};

struct Cat {
    void talk() {
        std::cout << "miau miau" << std::endl;
    }
};

template <typename T>
concept Talk = requires(T a) {
    { a.talk() } -> std::convertible_to<void>;
};

int main() {
    auto x = Dog{};
    auto y = Cat{};

    ??? pets = {x, y};

    for(auto& pet: pets) {
        pet.talk();
    }

    return 0;
}

c++ c++20 c++-concepts

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edited Apr 20 at 2:36

cigien

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asked Apr 20 at 2:00

kirbylifekirbylife

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3

• Nope, C++ does not work this way. – Sam Varshavchik Apr 20 at 2:02
• It is usually a bad idea to bring concepts from one language to another. – Slava Apr 20 at 2:06
• Most likely you are heading in the wrong direction. You are probably looking for polymorphism. – zdf Apr 20 at 6:04

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