#pragma once
#include <qobject.h>
#include <string>
using namespace std;
class Person :
    public QObject
{
    Q_OBJECT
public:
    Q_INVOKABLE Person(int age, string name)
    {
        this->_age = age;
        this->_name = name;
    }
    Person(const Person& p) noexcept {
        this->_age = p._age;
        this->_name = p._name;
    }
    Person&  operator =(const Person& p) noexcept {
        this->_age = p._age;
        this->_name = p._name;
        return *this;
    }
    Person& operator =(Person&& p) noexcept {
        this->_age = p._age;
        this->_name = p._name;
        return *this; 
    }
    Person(Person&& p) noexcept {
        this->_age = p._age;
        this->_name = p._name;
    }
    Person() noexcept {}
    ~Person()
    {}
    friend ostream& operator<<(ostream& os, const Person& dt);

private:
    int _age;
    string _name;
};

//Q_DECLARE_METATYPE(Person)










/****************************************************************************
** Meta object code from reading C++ file 'Person.h'
**
** Created by: The Qt Meta Object Compiler version 68 (Qt 6.7.2)
**
** WARNING! All changes made in this file will be lost!
*****************************************************************************/

#include "../../../../Person.h"
#include <QtCore/qmetatype.h>

#include <QtCore/qtmochelpers.h>

#include <memory>


#include <QtCore/qxptype_traits.h>
#if !defined(Q_MOC_OUTPUT_REVISION)
#error "The header file 'Person.h' doesn't include <QObject>."
#elif Q_MOC_OUTPUT_REVISION != 68
#error "This file was generated using the moc from 6.7.2. It"
#error "cannot be used with the include files from this version of Qt."
#error "(The moc has changed too much.)"
#endif

#ifndef Q_CONSTINIT
#define Q_CONSTINIT
#endif

QT_WARNING_PUSH
QT_WARNING_DISABLE_DEPRECATED
QT_WARNING_DISABLE_GCC("-Wuseless-cast")
namespace {

#ifdef QT_MOC_HAS_STRINGDATA
struct qt_meta_stringdata_CLASSPersonENDCLASS_t {};
constexpr auto qt_meta_stringdata_CLASSPersonENDCLASS = QtMocHelpers::stringData(
    "Person",
    "",
    "age",
    "string",
    "name"
);
#else  // !QT_MOC_HAS_STRINGDATA
#error "qtmochelpers.h not found or too old."
#endif // !QT_MOC_HAS_STRINGDATA
} // unnamed namespace

Q_CONSTINIT static const uint qt_meta_data_CLASSPersonENDCLASS[] = {

 // content:
      12,       // revision
       0,       // classname
       0,    0, // classinfo
       0,    0, // methods
       0,    0, // properties
       0,    0, // enums/sets
       1,   19, // constructors
       0,       // flags
       0,       // signalCount

 // constructors: parameters
    0x80000000 | 1, QMetaType::Int, 0x80000000 | 3,    2,    4,

 // constructors: name, argc, parameters, tag, flags, initial metatype offsets
       0,    2,   14,    1, 0x0e,    1 /* Public */,

       0        // eod
};

Q_CONSTINIT const QMetaObject Person::staticMetaObject = { {
    QMetaObject::SuperData::link<QObject::staticMetaObject>(),
    qt_meta_stringdata_CLASSPersonENDCLASS.offsetsAndSizes,
    qt_meta_data_CLASSPersonENDCLASS,
    qt_static_metacall,
    nullptr,
    qt_incomplete_metaTypeArray<qt_meta_stringdata_CLASSPersonENDCLASS_t,
        // Q_OBJECT / Q_GADGET
        QtPrivate::TypeAndForceComplete<Person, std::true_type>,
        // constructor 'Person'
        QtPrivate::TypeAndForceComplete<int, std::false_type>,
        QtPrivate::TypeAndForceComplete<string, std::false_type>
    >,
    nullptr
} };

void Person::qt_static_metacall(QObject *_o, QMetaObject::Call _c, int _id, void **_a)
{
    if (_c == QMetaObject::CreateInstance) {
        switch (_id) {
        case 0: { Person *_r = new Person((*reinterpret_cast<std::add_pointer_t<int>>(_a[1])),(*reinterpret_cast<std::add_pointer_t<string>>(_a[2])));
            if (_a[0]) *reinterpret_cast<QObject**>(_a[0]) = _r; } break;
        default: break;
        }
    } else if (_c == QMetaObject::ConstructInPlace) {
        switch (_id) {
        case 0: { new (_a[0]) Person((*reinterpret_cast<std::add_pointer_t<int>>(_a[1])),(*reinterpret_cast<std::add_pointer_t<string>>(_a[2]))); } break;
        default: break;
        }
    }
    (void)_o;
}

const QMetaObject *Person::metaObject() const
{
    return QObject::d_ptr->metaObject ? QObject::d_ptr->dynamicMetaObject() : &staticMetaObject;
}

void *Person::qt_metacast(const char *_clname)
{
    if (!_clname) return nullptr;
    if (!strcmp(_clname, qt_meta_stringdata_CLASSPersonENDCLASS.stringdata0))
        return static_cast<void*>(this);
    return QObject::qt_metacast(_clname);
}

int Person::qt_metacall(QMetaObject::Call _c, int _id, void **_a)
{
    _id = QObject::qt_metacall(_c, _id, _a);
    return _id;
}
QT_WARNING_POP






#include <QtCore/QCoreApplication>
#include <Person.h>
#include <QVariant>
#include <iostream>
using namespace std;
ostream& operator<<(ostream& os, const Person& dt)
{
    os << "{ age: " << dt._age << " , name: " << dt._name << " }";
    return os;
}
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    const QMetaObject* p = &Person::staticMetaObject;
    QVariant variant;
    
    Person *person = (Person*)p->newInstance(12, std::string("lilei"));
    variant.setValue<Person>(move(*person));
    Person personobj = variant.value<Person>();
    std::cout << personobj;
    //std::cout << std::is_copy_constructible_v<Person>;
    //std::cout << std::is_destructible_v<Person>;
    
    return a.exec();
}

值得关注的是在moc_Person.cpp的qt_static_metacall中增加了对QMetaObject::ConstructInPlace的处理
else if (_c == QMetaObject::ConstructInPlace) {
switch (_id) {
case 0: { new (_a[0]) Person((reinterpret_cast<std::add_pointer_t>(_a[1])),(reinterpret_cast<std::add_pointer_t>(_a[2]))); } break;
default: break;
}

但查看了Qt6.7的源码，目前没有看到提供针对ConstructInPlace构造的接口。