TextMode::Attribute Union Reference

Structure of a character attribute consists of 4 bit fore- and 3 bit background color, and a single blink bit. More...

#include <machine/textmode.h>

Public Member Functions
	Attribute (Color foreground=LIGHT_GREY, Color background=BLACK, bool blink=false)
	Attribute constructor (with default values)
void	invert ()

Public Attributes
struct {
uint8_t	foreground: 4
	.... XXXX Foreground color
uint8_t	background: 3
	.XXX .... Background color
uint8_t	blink: 1
	X... .... Blink
};
uint8_t	value
	combined value

Detailed Description

Structure of a character attribute consists of 4 bit fore- and 3 bit background color, and a single blink bit.

Bit fields can notably simplify the access and code readability.

Note

Type punning is indeed undefined behavior in C++. However, gcc explicitly allows this construct as a language extension. Some compilers (other than gcc might allow this feature only by disabling strict aliasing (-fno-strict-aliasing). In StuBS we use this feature extensively due to the improved code readability.

Constructor & Destructor Documentation

Attribute()

TextMode::Attribute::Attribute ( Color  foreground = LIGHT_GREY, Color  background = BLACK, bool  blink = false  )

inlineexplicit

Attribute constructor (with default values)

Parameters

foreground	Foreground color (Default: LIGHT_GREY)
background	Background color (Default: BLACK)
blink	Blink if true (default: no blinking)

Member Function Documentation

invert()

void TextMode::Attribute::invert ( )

inline

Member Data Documentation

[struct]

struct { ... } TextMode::Attribute

value

uint8_t TextMode::Attribute::value

combined value

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The documentation for this union was generated from the following file:

• machine/textmode.h