LongWord
│
English (en) │
A longWord
is an unsigned integer data type which is larger than a word
.[1]
Larger refers to both the permissible range of values and the size occupied in a packed
structure.
Definition
GNU Pascal Compiler
In GNU Pascal a longWord
is compatible to GNU C’s long long unsigned int
.
On some platforms it is 64 bits wide and thus has a range of 0..18446744073709551615
([math]\displaystyle{ \mathbb{Z} \cap \left[0, 2^{64}\right) }[/math]).
Free Pascal Compiler
For compatibility with Delphi, the FPC always defines longWord
as a 32-bit quantity, thus it may assume a value in the range 0..4294967295
([math]\displaystyle{ \mathbb{Z} \cap \left[0, 2^{32}\right) }[/math]).
The defunct {$mode GPC}
compiler compatibility mode did not change this.
In this definition, dWord
(double word) is an alias for longWord
.
As of version 3.2.0 the data type cardinal
is an unconditional alias for longWord
.
Application
- Because the FPC’s definition is fixed in size, it is frequently used when defining the exact memory layout of
record
data types that will be passed to foreign language libraries. If the external library is written C, use of thecTypes unit
is recommended. - Likewise, the GPC guarantees compatibility of certain integer data types with GNU C.[2] For maximum range, the GPC also defines
longestWord
.
See Also
simple data types |
|
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complex data types |