Can I define a struct inside a class?

Can I define a struct inside a class?

Yes you can. In c++, class and struct are kind of similar. We can define not only structure inside a class, but also a class inside one. It is called inner class.

Can we use typedef in class?

A typedef can also be used on classes with a parameterized port list as shown below.

What does typedef struct do in C++?

typedef is a reserved keyword in the programming languages C and C++. It is used to create an additional name (alias) for another data type, but does not create a new type, except in the obscure case of a qualified typedef of an array type where the typedef qualifiers are transferred to the array element type.

What is the difference between typedef struct and struct?

Basically struct is used to define a structure. But when we want to use it we have to use the struct keyword in C. If we use the typedef keyword, then a new name, we can use the struct by that name, without writing the struct keyword.

Can you put a struct in a struct?

One structure can be declared inside other structure as we declare structure members inside a structure. The structure variables can be a normal structure variable or a pointer variable to access the data.

Can you typedef a class in C++?

Similarly, typedef can be used to define a structure, union, or C++ class. For example: typedef struct { int scruples; int drams; int grains; } WEIGHT; In C++, a typedef name must be different from any class type name declared within the same scope.

Where do I put typedef?

3 Answers

1. First way is to typedef at the place-of-first-declaration.
2. Second way is to typedef at each place-of-use, and make it only visible to that place-of-use (by putting it inside the class or method that uses it).

Is typedef necessary in C++?

typedef is necessary for many template metaprogramming tasks — whenever a class is treated as a “compile-time type function”, a typedef is used as a “compile-time type value” to obtain the resulting type.

What is the use of typedef explain with example?

typedef is used to define new data type names to make a program more readable to the programmer. These examples are EXACTLY the same to the compiler. But the right hand example tells the programmer the type of money he is dealing with. A common use for typedef is to define a boolean data type as below.

Should typedefs be inside or outside the class?

When the typedef is used only within the class itself (i.e. is declared as private) I think its a good idea. However, for exactly the reasons you give, I would not use it if the typedef’s need to be known outside the class. In that case I recommend to move them outside the class.

Is it possible to define a class inside a struct?

Note also that the same technique of the most upvoted answer can be used to define a class inside a class, a struct inside a struct, and a class inside a struct. class and struct are only different for the default visibility of their members (private and public, respectively). – Daniel Daranas Mar 30 ’10 at 9:00

How to define types inside a struct in C language?

In C language every declaration inside struct must declare a data field (possibly unnamed). That means that it is possible to define types inside a struct in C, as long as the new type declaration is embedded as a part of a data field declaration. For example In the above example type struct Inner is declared inside type struct Outer.

What is the use of typedef in C with example?

typedef unsigned char byte; You can use typedef to give a name to your user defined data types as well. For example, you can use typedef with structure to define a new data type and then use that data type to define structure variables directly as follows −. Live Demo.