What is object slicing

What is object slicing in C++ and when does it happen?

Jul 13, 2022 in C++ by Nicholas
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What is a Class and Object in C++?

A Class is like a blueprint, an ...READ MORE

answered Jun 21, 2022 in C++ by Damon
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What is dynamic initialization of object in c++?

Dynamic initialization occurs when the initialization value is unknown at compile time. To initialise the variable, it is calculated at runtime. Example, int factorial(int n) { ...READ MORE

answered Aug 2, 2022 in C++ by Damon
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What data structure is inside std::map in C++?

An associative container is std::map. The standard's ...READ MORE

answered May 31, 2022 in C++ by Damon
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What is the C++ function to raise a number to a power?

What's the best way to raise a n ...READ MORE

Jun 1, 2022 in C++ by Nicholas
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What is a smart pointer and when should I use one?

A smart pointer is similar to a ...READ MORE

answered Jun 2, 2022 in C++ by Damon
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In C++, what is a virtual base class?

When employing multiple inheritance, virtual base classes are used to prevent several "instances" of a particular class from appearing in an inheritance hierarchy. Consider the following example: class A { public: void Foo() {} ...READ MORE

answered Jun 10, 2022 in C++ by Damon
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What is the difference between public, private, and protected inheritance in C++?

To begin answering that question, let me characterise member accessors in my own terms. If you already know this, proceed to the section "next:". I'm aware of three types of accessors: public, protected, and private. Let: class Base { public: ...READ MORE

answered Jul 11, 2022 in C++ by Damon
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How is inheritance in C++ different than that in Java?

The purpose of inheritance is same for ...READ MORE

answered Feb 6, 2019 in Java by Priyaj
• 58,020 points • 977 views

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What is this weird colon-member (" : ") syntax in the constructor?

Foo(int num): bar(num) In C++, this is known as a Member Initializer List. Simply put, it sets the value of your member bar to num. There is a significant difference between initializing a member with the Member initializer list and assigning a value to it within the function Object() { [native code] } body. When you use the Member initializer list to initialise fields, the constructors are only called once, and the object is constructed and initialised in a single operation. If you use assignment, the fields will be initialised with default constructors and then reassigned with actual values (via the assignment operator). As you can see, there is an extra overhead of creation and assignment in the latter, which may be significant for user defined classes. Cost of Member Initialization =Object ...READ MORE