Operator new allocates memory from the heap, on which an object is constructed. Standard C++ also supports placement new operator, which constructs an object on a pre-allocated buffer. This is useful when building a memory pool, a garbage collector or simply when performance and exception safety are paramount (there’s no danger of allocation failure since the memory has already been allocated, and constructing an object on a pre-allocated buffer takes less time):
void placement() {char *buf = new char[1000]; //pre-allocated buffer string *p = new (buf) string("hi"); //placement new string *q = new string("hi"); //ordinary heap allocation cout<c_str()<c_str();< 
Charlie has over a decade of experience in website administration and technology management. As the site admin, he oversees all technical aspects of running a high-traffic online platform, ensuring optimal performance, security, and user experience.
