quartz/content/notes/11-struct-and-union.md

title	aliases	tags
11-struct-and-union		cosc204

Struct

not a calss

• class like composite data type called struct
• POD plain old data

declare

struct <name>{
	<type><name>;
	<type><name>;
} <variable>;

struct point_2d {
	double x;
	double y;
} point;

typically an anonymous struct is declared and then given a name with typedef

typedef struct {
	double x;
	double y;
} point_2d;

This is the common convention now.

initalize

point_2d location = {0.0, 1.0}; //initalizers
point_2d location = {.y = 1.0, .x = 0.0}; //designated initalizers

accessing

use the .

point_2d location;

location.x = 0;
location.y = 1;

shallow copy

copy the members including pointers

• but not the things the pointers point to

both point to the same memory location. when you change one - they both change.

passing to routines

passed by value

void print(thing object)