Deep copy vs Shallow Copy

What's the distinction between deep and shallow copy? A copy function creates what kind of copy?

Jun 29, 2022 in C++ by Nicholas
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why are copy constructors needed and what are the cases where they are very helpful?

A copy constructor is a member function ...READ MORE

answered May 31, 2022 in C++ by Damon
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Code Not working in VS Code but works in OnlineGDB

I am practicing about primeSieve with C++ language in VS Code 1.57.1. Can ...READ MORE

Jun 1, 2022 in C++ by Nicholas
• 7,760 points • 730 views

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Ternary operator ?: vs if...else

It's not any faster. There is one difference when you can initialize a constant variable using an expression: const int x = (a<b) ? b ...READ MORE

answered Jun 7, 2022 in C++ by Damon
• 4,960 points • 1,096 views

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C++ - Overloading vs Overriding in Inheritance

In C++, a derived class's method only overrides the base class's method if their declarations match (I say "match," but I'm not sure what the formal term is). That is, all arguments must be of the same type, with the same const qualification. If there are any mismatches, the derived class's method hides all methods with the same name rather than overriding. This is what the "ERROR" in your image is attempting to convey. So, in that image, / overrides in a comment is incorrect and misleading. Yes, many C++ instructors are unaware of these somewhat esoteric details. Furthermore, if you want to override, your base class's method must be virtual; otherwise, polymorphism will not work. . We could also say that the derived-class method hides the base-class method if it wasn't virtual. The part about hiding, on the other hand, has almost no meaning here; what this term really means is that you're not in charge. Furthermore, overloading is the presence of multiple methods with the same name but different signatures, as you may have noticed. To be useful, they must all be present in the derived class; otherwise, they will be hidden if the derived class only has one method, fa1, and the other fa1 are in the base. There is, however, a syntax sugar that "copies" all fa1 from base to derived, removing all the hidden semantics: class A { public: void fa1(); ...READ MORE

answered Jun 7, 2022 in C++ by Damon
• 4,960 points • 834 views

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C++ - Overloading vs Overriding in Inheritance

In C++, a derived class's method only overrides the base class's method if their declarations match (I say "match," but I'm not sure what the formal term is). That is, all arguments must be of the same type, with the same const qualification. If there are any mismatches, the derived class's method hides all methods with the same name rather than overriding. This is what the "ERROR" in your image is attempting to convey. So, in that image, / overrides in a comment is incorrect and misleading. Yes, many C++ instructors are unaware of these somewhat esoteric details. Furthermore, if you want to override, your base class's method must be virtual; otherwise, polymorphism will not work. We could also say that the derived-class method hides the base-class method if it wasn't virtual. The part about hiding, on the other hand, has almost no meaning here; what this term really means is that you're not in charge. Furthermore, overloading is the presence of multiple methods with the same name but different signatures, as you may have noticed. To be useful, they must all be present in the derived class; otherwise, they will be hidden if the derived class only has one method, fa1, and the other fa1 are in the base. There is, however, a syntax sugar that "copies" all fa1 from the base to the derived. class A { public: void fa1(); ...READ MORE

answered Jun 7, 2022 in C++ by Damon
• 4,960 points • 1,082 views

0 votes

1 answer

c++ constructor and copy constructor

In a pre-C++17 compiler, this is known as copy elision (test it with C++17 on compiler explorer or wandbox with -std=c++17 vs. -std=c++14 flags). As of C++17, the compiler must delete numerous instances of copy and move constructors and create objects directly without the need of intermediary objects. Unlike A a { 10 }; the line A a ...READ MORE