What does this (unusual?) structure definition mean?

[Frederiek]

Hi,

What exactly does the following code mean? More specific, what are the
colons for? Is this some kind of way to initialize the structure
members?

struct somestruct
{
unsigned char a:1;
unsigned char b:1;
unsigned char c:1;
};

Regards,

Frederiek

 

[Jewel]

Hi,

What exactly does the following code mean? More specific, what are the
colons for? Is this some kind of way to initialize the structure
members?

struct somestruct
{
unsigned char a:1;
unsigned char b:1;
unsigned char c:1;
};

Regards,

Frederiek

Look in your favorite reference for bitfields.

 

[BigBrian]

Hi,

What exactly does the following code mean? More specific, what are the
colons for? Is this some kind of way to initialize the structure
members?

struct somestruct
{
unsigned char a:1;
unsigned char b:1;
unsigned char c:1;
};

Regards,

Frederiek

It's declaring a bit field.

-Brian

 

[Jakob Bieling]

What exactly does the following code mean? More specific, what are the
colons for? Is this some kind of way to initialize the structure
members?

struct somestruct
{
unsigned char a:1;
unsigned char b:1;
unsigned char c:1;
};

It's called a bit-field. a, b and c are each one bit (that is what
the number after the colon means).

regards