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new and delete operator in c++

Frightened Flamingo on Apr 23, 2021

// Pointer initialized with NULL
// Then request memory for the variable
int *p = NULL; 
p = new int;   

            OR

// Combine declaration of pointer 
// and their assignment
int *p = new int;

Source: www.geeksforgeeks.org

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new in c++

Alive Angelfish on Jun 16, 2020

//placement new in c++
char *buf  = new char[sizeof(string)]; // pre-allocated buffer
string *p = new (buf) string("hi");    // placement new
string *q = new string("hi");          // ordinary heap allocation
/*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):
*/

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"new and delete operator in c++" Code Answer's