GoF Command Pattern using C++ Lambdas

cplusplus_lambdas_kata.cpp

#include <iostream>
#include <stack>
#include <functional>

using Receiver = std::function<void(std::function<void()>)>;

class Command {
public:
    virtual void setReceiver(Receiver receiver) = 0;
    virtual void execute() = 0;
};

class Data1 : public Command {
private:
    std::string str1 = "Suzuki";
    std::string str2 = "Ichiro";
    Receiver receiver;

public:
    void setReceiver(Receiver rec) override {
        receiver = rec;
    }

    void execute() override {
        receiver([&] {std::cout << str1 << " " << str2 << std::endl;});
    }
};

class Data2 : public Command {
private:
    std::string str = "Jonney";
    Receiver receiver;

public:
    void setReceiver(Receiver rec) override {
        receiver = rec;
    }

    void execute() override {
        receiver([&] {std::cout << str << std::endl;});
    }
};

class Invoker {
private:
    std::stack<std::function<void()>> commands;

public:
    void addCommand(std::function<void()> command) {
        commands.push(command);
    }

    void execute() {
        while (!commands.empty()) {
            auto command = commands.top();
            commands.pop();
            command();
        }
    }
};

int main() {
    auto namePrinter = [](std::function<void()> executor) {
        executor();
    };

    auto data1 = Command{[&](){std::cout << "Suzuki Ichiro" << std::endl;}};
    data1.setReceiver(namePrinter);
    auto data2 = Command{[&](){std::cout << "Jonney" << std::endl;}};
    data2.setReceiver(namePrinter);

    Invoker invoker;
    invoker.addCommand(std::bind(&Command::execute, data1));
    invoker.addCommand(std::bind(&Command::execute, data2));

    invoker.execute();

    return 0;
}