C++ Structures

For Beginners

2 comments, last by rip-off 16 years, 2 months ago

398

Author

February 02, 2008 06:49 AM

Hiya, I have a quick question I was hoping someone could answer - what's the difference between these two structure declarations?


struct MYSTRUCT
{
   int a;
};

struct
{
   int a;
} MYSTRUCT;

Thanks for any help - I've always assumed they are the same, but thought I'd check! [smile]

1,596

February 02, 2008 06:51 AM

The first defines a structure named MYSTRUCT.

The second defines a variable named MYSTRUCT of an unnamed structure type.

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398

Author

February 02, 2008 06:55 AM

That's great, thanks.

11,000

February 02, 2008 07:33 AM

Often in C you will see code like this:

typedef struct Foo {   int a;} Foo;

This doesn't declare any variables, it just allows one to reference a structure without dealing with the structure "namespace".

Example:

struct One { int a; };void frobnicate( struct One * );// void frobnicate( One * ); causes error

Versus:

typedef struct One { int a; } One;// void frobnicate( struct One * ); could still do thisvoid frobnicate( One * ); // easier to read

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