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Tip of the Day
Language: C++
Expertise: Advanced
Apr 20, 1999

Construct an Object on a Pre-Allocated char Array

The memory buffer returned by operator new is guaranteed to have the suitable alignment properties for any type object. This property enables you to construct objects on such a pre-allocated char array. For example:
 
#include <new>
#include <iostream>
#include <string>
using namespace std;

class Employee{ /*...*/};

void f(){  
  char * pc = new char[sizeof(Employee)];
  Employee *pemp = new (pc) Employee;  //construct on properly aligned char array
  //...use pemp
  pemp->Employee::~Employee(); //explicit destruction
  delete [] pc;
} 
Danny Kalev
 
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