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From: "Jeffrey R. Carter" <jrcarter@acm.org>
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Subject: Re: String literals and wide_string literals - how?
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Date: 2007-04-20T22:09:31+00:00
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Robert A Duff wrote:
> 
>     type Bit is ('0', '1');
>     type Bit_String is array (Positive range <>) of Bit;
>     pragma Pack(Bit_String);
>     X: constant Bit_String := "01011110";
> 
> Bit is a character type, and Bit_String is a string type.
> 
> X can fit in 8 bits, by the way.

for Bit'Size use 1;
for Bit_String'Component_Size use Bit'Size;

subtype Byte_String is Bit_String (1 .. 8);

Y : constant Byte_String := "00001111";
pragma Assert (Y'Size = Y'Length);

type Byte is mod 2 ** 8;
for Byte'Size use 8;

function To_Byte is new Ada.Unchecked_Conversion
    (Source => Byte_String, Target => Byte);

Z : constant Byte := To_Byte (Y);

What is Z and 1?

-- 
Jeff Carter
"You empty-headed animal-food-trough wiper."
Monty Python & the Holy Grail
04