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This is purely out of interest. I searched around a bit, knowing that instances of classes are called objects, but I couldn't find what the correct word is for an instance of a struct in C, C++, C#, etc. Do we even have a word for this?
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An instance of a class is traditionally known as an object. However, Swift structures and classes are much closer in functionality than in other languages, and much of this chapter describes functionality that applies to instances of either a class or a structure type.
As said by David Heffernan and Henk Holterman its because structs are value types and hence instantiates while declaring it.
Short answer: Structs are value types. Classes(Objects) are reference types. Show activity on this post. By their nature, an object has methods, a struct doesn't.
Struct Instantiation Using new Keyword An instance of a struct can also be created with the new keyword. It is then possible to assign data values to the data fields using dot notation.
In C#, is an instance of a struct considered an object? Errr…kind of. A struct is a value type, and you’ll get yourself in trouble if you try to simplify it by saying it’s an object. Let’s say you have a class called Coordinates with fields X and Y that can be set in the constructor. Coordinates c1 = new Coordinates (1, 2); // X is 1, Y is 2.
We have to create an instance of the struct. To create a C++ struct, we use the struct keyword. Pointers pointing to a struct are created similarly to how pointers which is pointing to regular types are created. A struct can be passed as an argument to a function in the same way ordinary functions are passed.
In C++, classes and structs are blueprints that are used to create the instance of a class. Structs are used for lightweight objects such as Rectangle, color, Point, etc. Unlike class, structs in C++ are value type than reference type.
C++ Structure is a collection of different data types. It is similar to the class that holds different types of data. struct structure_name { // member declarations. } In the above declaration, a structure is declared by preceding the struct keyword followed by the identifier (structure name).
It is perfectly valid to call it an object even in C.
C99 Standard §3.15:
Para 1:
object
region of data storage in the execution environment, the contents of which can represent values
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In C and C++ word 'object' is much more general. It refers also to structure objects or primitives. From C99 standard:
object
region of data storage in the execution environment, the contents of which can represent values
In C++ classes and structures are equivalent and types defined with struct are also considered class types. Standard uses expressions like object of class type or object of class X.
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