c – 释放DLL创建的对象

int ReleaSEObject(lua_State* L)
{
    // object pointer is stored in field [0]
    lua_rawgeti(L,-1,0);
    delete (Object*) lua_touserdata(L,-1);
    return 0;
}

考虑在dll的客户端上使用std :: unique_ptr或std :: shared_ptr(使用自定义删除器调用ReleaSEObject),这些可以正确地处理跨dll边界删除.

另外,将dll接口完全保持为“C”是一个很好的做法,这样dll就可以使用不同的c运行时进行编译,并且名称保持不变.
不是从dll继承基类实现,而是导出BaseImpl * CreateBaseImpl();
void deleteBaseImpl(BaseImpl *);
这对函数让它们返回一个指向你需要的实现的指针.然后该指针应该被送到您选择的智能指针.使BaseImpl的公共接口仅使用原始类型(句柄,数字,指向这样的指针,C数组 – 好; stl容器 – 不好：创建cpp运行时依赖性)

我猜它看起来像：

// code using LUA - unconcerned with the cross-dll nature of the implementation
...
{
    auto p = new ConcreteImpl(); // pass p to LUA as you normally would
    ...
    // when LUA wants it deleted:
    delete p;
    p = nullptr;
    // probably tell LUA it was deleted
}
...

// BaseImpl.h - Dll Interface  header

class BaseImpl;

extern "C" BaseImpl * CreateBaseImpl();
extern "C" void deleteBaseImpl(BaseImpl *p);

// Client code

#include "BaseImpl.h"

#include <type_Traits>
#include <memory>

#include <Windows.h>

class ConcreteImpl { // no inheritance probably necessary
{
    using namespace std;
    ...
    ConcreteImpl() 
    :   m_ptrDll( ::LoadLibraryW(L"BaseImpl.dll"),&::FREELIbrary ),m_ptrBase( nullptr,[](BaseImpl *){} )
    {
        Assert( m_ptrDll,"LoadLibraryW() Failed err=0x%x",::GetLastError() );

        auto pfnCreate = reinterpret_cast<decltype(&CreateBaseImpl)>(
            ::GetProcAddress(m_ptrDll.get(),"CreateBaseImpl") );

        auto pfndelete = reinterpret_cast<decltype(&deleteBaseImpl)>(
            ::GetProcAddress(m_ptrDll.get(),"deleteBaseImpl") );

        Assert( pfnCreate && pfndelete,"GetProcAddress() Failed err=0x%x",::GetLastError() );

        // use move constructor to assign new value
        m_ptrBase = decltype(m_ptrBasE)( pfnCreate(),pfndelete );

        Assert( m_ptrBase,"CreateBaseImpl returned nullptr" );
    }
    ...
    // methods that use m_ptrBase go here
    ...
    unique_ptr<
        remove_pointer<HMODULE>::type,decltype(&::FREELIbrary)
    > m_ptrDll;

    unique_ptr<BaseImpl,decltype(&deleteBaseImpl)> m_ptrBase;        
};