#include <cassert>
#include <memory>
#include <string>
#include <utility>

std::string decorate(std::string text) {
    text += '!';
    return text;
}

int consume(std::unique_ptr<int> value) {
    assert(value);
    return *value;
}

int main() {
    std::string original = "C++";
    assert(decorate(original) == "C++!");
    assert(original == "C++");
    auto owner = std::make_unique<int>(42);
    int result = consume(std::move(owner));
    assert(result == 42);
    assert(!owner);
}