完整示例：

#include <iostream>
#include <format>
#include <iomanip>

void test_00(){
    struct Box{
        int width_;
        int height_;
        std::string name_;
    };

    Box box{3,4,"amazing"};
    auto [w, h, name]{box};
    //auto [w, h, name] = box;
    std::cout << "w=" << box.width_ << ", h=" << box.height_ << ", name=" << box.name_ << std::endl;  // w=3, h=4, name=amazing
}

void test_01(){
    struct Box{
        int width_;
        int height_;
        std::string name_;
    };

    Box box{3,4,"amazing"};
    //auto [w, h, name]{box};
    auto [w, h, name] = box;
    std::cout << std::format("w={}, h={}, name={}\n", w, h, name); // w=3, h=4, name=amazing
    std::cout << std::quoted(box.name_) << std::endl;              // "amazing"
}

int main(){
    test_00();
    test_01();
}