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C++ Fundamentals for Professionals

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Explore how the default keyword allows compiler-generated constructors and destructors, and how delete restricts unwanted operations like copying or heap allocation. This lesson helps you master better control over class behavior in C++ for safer and clearer code.

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Constructors and destructors using default

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 ...