new placement 的使用

#include <iostream> #include "TModel.h" int main()
{
    char * p_char=new char[];
    std::cout<<"Source Location = "<<unsigned(p_char)<<std::endl;
    TModel * pTModel;
    pTModel=new (p_char)TModel;
    pTModel->Show();
    delete pTModel;     //The Second Part.
    TModel * pTModel2=(TModel *)(new char[sizeof(TModel)]);     //If omitted,<Bad Ptr>
    //at    std::cout<<"Location = "<<unsigned(this)
    //  <<" , Name = "<<m_sName
    //  <<std::endl;
    pTModel2=new (pTModel2)TModel;     std::cout<<"Source 2 Location = "<<unsigned(pTModel2)<<std::endl;
    pTModel2->Show();
    delete pTModel2;     getchar();     return ;
}; 

#include "TModel.h"
#include <iostream> void TModel::Show()
{
    std::cout<<"Location = "<<unsigned(this)
        <<" , Name = "<<m_sName
        <<std::endl;
}; TModel::TModel()
{
    m_sName="Hello";
}; TModel::~TModel()
{ };