dynamic memory allocation in c++ gfg code example
Example 1: what is dynamic memory allocation in c++
In the dynamic memory allocation the memory is allocated during run time.
The space which is allocated dynamically usually placed in a program segment which is known as heap.
In this, the compiler does not need to know the size in advance.
In C++, dynamic memory allocation means performing memory allocation manually by programmer.
It is allocated on the heap and the heap is the region of a computer memory which is managed by the programmer using pointers to access the memory.
The programmers can dynamically allocate storage space while the program is running but they cannot create a new variable name.
Example:
Example 2: new in c++
#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() {
int* b = new int;
int* c = new int[50];
Entity* e1 = new Entity;
Entity* e = new Entity[50];
Entity* alloc = (Entity*)malloc(sizeof(Entity));
delete e;
Entity* e3 = new(c) Entity();
Example 3: dynamic memory allocation in c++
char* pvalue = NULL;
pvalue = new char[20];
Example 4: dynamic memory allocation in c++
#include <iostream>
using namespace std;
int main () {
double* pvalue = NULL;
pvalue = new double;
*pvalue = 29494.99;
cout << "Value of pvalue : " << *pvalue << endl;
delete pvalue;
return 0;
}