C++ : new operator and operator new

The new operator in C++ is something that cannot be changed . For example
when you use code something like this ,

string *ps = new string("Memory Management");

the new operator is used . Its sole purpose is to allocate memory and initialize it.

The new operator in turn uses the operator new to allocate memory which can be overloaded.

its prototype looks like this :

void * operator new(size_t size);

there is another version of new operator called the placement new , that is used to create objects in pre initialized memory. example usage for it looks like this :

string *ps = new(memory) string("Memory Management");

same is the case for delete operator and operator delete

operator new[] is another type of operator that can be used to allocate new arrays