This keyword is used in the declaration offixed point types. Delta represents the absolute error bound of afixed point type; that is, delta gives a hint to the compiler how to choose the smallest incremental value of the type, called theSmall of the type. This Small value is accessible via the attribute T'Small.
For Ordinary fixed point types, it is by default a power of two not greater than the delta; it is specifyable by an attribute clause to be any value not greater than the delta.
For decimal fixed point types, the Small value is equal to the delta, which of course must be a power of ten.
typeFixed_Pointisdelta0.01digits10;-- A decimal fixed point typeMy_Fixed_Point : Fixed_Point := 0.0;...My_Fixed_Point := 0.1;-- OkMy_Fixed_Point := 0.02;-- OkMy_Fixed_Point := 0.001;-- Oops - this value is too small.-- It will be represented by zero.
| Ada Keywords | ||||
|---|---|---|---|---|
abort | else | new | return | |
abs | elsif | not | reverse | |
abstract (Ada 95) | end | null | ||
accept | entry | select | ||
access | exception | of | separate | |
aliased (Ada 95) | exit | or | some (Ada 2012) | |
all | others | subtype | ||
and | for | out | synchronized (Ada 2005) | |
array | function | overriding (Ada 2005) | ||
at | tagged (Ada 95) | |||
generic | package | task | ||
begin | goto | parallel (Ada 2022) | terminate | |
body | pragma | then | ||
if | private | type | ||
case | in | procedure | ||
constant | interface (Ada 2005) | protected (Ada 95) | until (Ada 95) | |
is | use | |||
declare | raise | |||
delay | limited | range | when | |
delta | loop | record | while | |
digits | rem | with | ||
do | mod | renames | ||
requeue (Ada 95) | xor | |||