c++ replacement new 操作

#include <string.h>

#include <malloc.h>

#include <new>//注意必须包括此头文件

class CTest

{

public:
CTest(int i,int ii)
{
m = i;
n = ii;
p = new char[100];
strcpy(p,"good test");
}
~CTest()
{
m = 11;
n = 13;
delete[] p;
p = NULL;
}

public:
int m;
int n;

char *p;

};

int main(int argc, char* argv[])

{

char * p = (char*)malloc(sizeof(CTest));
/*-------------------------------------------------------*/
// CTest * pt = new(p) CTest;

//equals with

CTest * pt = (CTest*) p;
pt->CTest::CTest(1,2);//调用构造函数

/*-------------------------------------------------------*/

pt->~CTest();//调用析构

free(p);

return 0;

}