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new keyword in cpp

Alive Angelfish answered on June 16, 2020 Popularity 10/10 Helpfulness 4/10

answer new keyword in cpp

new keyword in cpp

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#include <iostream>
#include <string>

using String = std::string;
class Entity
{
private:
	String m_Name;
public:
	Entity() : m_Name("Unknown") {}
	Entity(const String& name) : m_Name(name) {}
	const String& GetName() const {
		return m_Name;
	};
};
int main() {
  // new keyword is used to allocate memory on heap
	int* b = new int; // new keyword will call the c function malloc which will allocate on heap  memory = data and return a ptr to that plaock of memory
	int* c = new int[50];
	Entity* e1 = new Entity;//new keyword Not allocating only memory but also calling the constructor
	Entity* e = new Entity[50];
	//usually calling new will  call underlined c function malloc
	//malloc(50); 
	Entity* alloc = (Entity*)malloc(sizeof(Entity));//will not call constructor only  allocate memory = memory of entity
	delete e;//calls a c function free
	Entity* e3 = new(c) Entity();//Placement New
}

Popularity 10/10 Helpfulness 4/10 Language cpp

Source: Grepper

Tags: c++ keyword

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Contributed on Jun 16 2020

Alive Angelfish

0 Answers Avg Quality 2/10

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