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Given:
struct objStruct { int id; int value; }; typedef struct objStruct Object; Is there a shortcut to allocate and initialize the object, something like a C++ constructor?
It could even be a preprocessor macro. Whatever makes the code shorter and more readable than this:
Object *newObj = malloc(sizeof(Object)); // successful allocation test snipped newObj->id = id++; newObj->value = myValue; 
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3. Constructor creation in structure: Structures in C cannot have a constructor inside a structure but Structures in C++ can have Constructor creation.
A structure called Struct allows us to create a group of variables consisting of mixed data types into a single unit. In the same way, a constructor is a special method, which is automatically called when an object is declared for the class, in an object-oriented programming language.
Technically, a struct is like a class , so technically a struct would naturally benefit from having constructors and methods, like a class does. But this is only “technically” speaking.
A structure type definition can include more than one constructor, as long as no two constructors have the same number and types of parameters.
In C I typically create a function in the style of a constructor which does this. For example (error checking omitted for brevity)
Object* Object_new(int id, int value) { Object* p = malloc(sizeof(Object)); p->id = id; p->value = value; return p; } ... Object* p1 = Object_new(id++, myValue); If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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