OpenEuphoria

2. Re: namespace and switch problems

• Posted by jeremy (admin) Dec 28, 2010
• 1067 views

export limits visibility to the including file only. public allows one to use public include to pass on the public methods to the parent.

support.e

public procedure say_hello() 
    puts(1, "Hello") 
end procedure 
 
export procedure say_goodbye() 
    puts(1, "Goodbye") 
end procedure 

mylib.e

public include support.e 
-- many other files included there that make up your entire lib 
 
say_hello() -- Hello 
say_goodbye() -- Goodbye 

myapp.ex

include mylib.e 
 
say_hello() -- Hello 
say_goodbye() -- ERROR, say_goodbye is not visible. It's for internal use in mylib.e only. 

Now, switch. Say you have this:

if color = 1 then 
    puts(1, "Red") 
elsif color = 2 then 
    puts(1, "Green") 
else  
    puts(1, "Blue") 
end if 

This would be better written (less code and higher performance) as a switch statement. A switch statement makes the decision once and jumps to the appropriate case statement.

switch color do 
    case 1 then 
        puts(1, "Red") 
    case 2 then 
        puts(1, "Green") 
    case else 
        puts(1, "Blue") 
end switch 

Jeremy