gcc/testsuite/gnat.dg/rep_clause2.ads

   1 with Unchecked_Conversion;
   2
   3 package Rep_Clause2 is
   4
   5    type Tiny is range 0 .. 3;
   6    for Tiny'Size use 2;
   7
   8    type Small is range 0 .. 255;
   9    for Small'Size use 8;
  10
  11    type Small_Data is record
  12       D : Tiny;
  13       N : Small;
  14    end record;
  15    pragma Pack (Small_Data);
  16
  17    type Chunk is
  18    record
  19       S : Small_Data;
  20       C : Character;
  21    end record;
  22
  23    for Chunk use record
  24       S at 0 range  0 .. 15;
  25       C at 2 range  0 .. 7;
  26    end record;
  27
  28    type Index is range 1 .. 10;
  29
  30    type Data_Array is array (Index) of Chunk;
  31    for Data_Array'Alignment use 2;
  32    pragma Pack (Data_Array);
  33
  34    type Data is record
  35      D : Data_Array;
  36    end record;
  37
  38    type Bit is range 0 .. 1;
  39    for Bit'Size use 1;
  40
  41    type Bit_Array is array (Positive range <>) of Bit;
  42    pragma Pack (Bit_Array);
  43
  44    type Byte is new Bit_Array (1 .. 8);
  45    for  Byte'Size use 8;
  46    for  Byte'Alignment use 1;
  47
  48    function Conv
  49      is new Unchecked_Conversion(Source => Small, Target => Byte);
  50
  51    procedure Assign (From : Data; Offset : Positive; I : Index; To : out Bit_Array);
  52
  53 end Rep_Clause2;