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Request and Suppress Examples

Request and Suppress Examples

Let's see examples of how the `default` and `delete` keywords can be used to our benefit.

Constructors and destructors using default

Let’s take a look at the code in the following example:

C++
#include <iostream>
class SomeType{
  public:
  // state the compiler generated default constructor
  SomeType() = default;
  // constructor for int
  SomeType(int value){
    std::cout << "SomeType(int) " << std::endl;
  };
  // explicit Copy Constructor
  explicit SomeType(const SomeType&) = default;
  // virtual destructor
  virtual ~SomeType() = default;
};
int main(){
  std::cout << std::endl;
  SomeType someType;
  SomeType someType2(2);
  SomeType someType3(someType2);
  std::cout << std::endl;
}

Explanation

In this example, we can see how default can be used to get the default implementations of constructors and destructors from the compiler.

  • Since we have defined a parameterized constructor in line 10, the compiler will not automatically create a default constructor.

  • Hence, we have to ...