Std::make_unique in C++ 14 - Coding

std::make_unique is a utility function in C++ that was introduced in C++14. It is used to create a unique_ptr object, which is a smart pointer that manages the lifetime of dynamically allocated objects. It is defined inside <memory> header file.

Syntax

std::make_unique <object_type> (arguments);

Parameters

object_type: It is the type of object you want to create.
arguments: It is the argument list for the constructor of object_type.

Return Type

This function returns a unique_ptr of type object_type.

It is the preferred way to create a std::unique_ptr, as it is safer than using the new operator directly because the object is automatically destroyed when it goes out of scope.

Examples of std::make_unique

The following programs demonstrate how to implement std::make_unique() in our programs.

Example 1

C++

// C++ code to implement std::make_unique() 
#include <iostream> 
#include <memory> 
using namespace std; 
  
class Geeks { 
public: 
    Geeks() { cout << "Object Created\n"; }  // constructor 
    ~Geeks() { cout << "Object Destroyed"; }  // destructor 
}; 
  
void f() 
{ 
      // creating unique ptr object 
    unique_ptr<Geeks> o = make_unique<Geeks>(); 
} 
  
int main() 
{ 
  
    f(); 
    return 0; 
}

Output

Object Created
Object Destroyed

Example 2

C++14

// C++ code to implement std::make_unique() 
#include <iostream> 
#include <memory> 
using namespace std; 
  
class Geeks { 
public: 
    int d; 
  
    // construtor 
    Geeks(int x) 
    { 
        this->d = x; 
        cout << "Object Created\n"; 
    } 
  
    // destructor 
    ~Geeks() { cout << "Object Destroyed"; } 
}; 
  
void f() 
{ 
    // creating unique ptr object 
    unique_ptr<Geeks> o = make_unique<Geeks>(10); 
    cout << o->d << endl; 
} 
  
int main() 
{ 
  
    f(); 
    return 0; 
}

Output

Object Created
10
Object Destroyed

Advantages of std::make_unique

Unlike new, make_unique is exception safe.
No cleanup is necessary if make_unique is not evaluated.

Reffered: https://www.geeksforgeeks.org

C++

Related
Fold Expressions in C++ 17
Avoid Bugs Using Modern C++
C++23 - <expected> Header
C++ Standards and Implementations
Inline Variables in C++ 17

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