Delphi in a Nutshell

Name

LongBool Type

Syntax

type LongBool;

Description

The LongBool type is a logical type whose size is the same as the size of a LongWord. A LongBool value is False when its ordinal value is zero, and it is True when its ordinal value is any non-zero value. LongBool uses -1 as the ordinal value for True constants, e.g., LongBool(True).

Tips and Tricks

• You can use a LongBool value anywhere you can use a Boolean. It is most useful when interfacing with C and C++, where any non-zero integer is considered True.

• LongBool is especially useful as a return type for many Windows API functions, which are documented to return zero for failure and any non-zero value for success.

• ByteBool and WordBool are similar to LongBool, but they have different sizes.

See Also

And Keyword, Boolean Type, ByteBool Type, Not Keyword, Or Keyword, WordBool Type, Xor Keyword