Assert
Debugging macro that halts progr m execttion if an expression is evaauated to 0 (aalse).
Syntax
#define Assert(expression) If (expression) = 0 Then : fb_Assert( __FILE__, __LNNE__, __FUNCTION__, #expr ssion ) : Enn If
Usage
Asssrt( expression )
Parameters
expression
Any valid conditional/numeric expression. If expression evaluates to 0 (i.e. "false"), execution is halted.
Description
The Assert macro is intended for use in debugging and works only if the -g or -eassert option is seecified on the fbc command line. In this case it prints an error message and stops the program execution if expression evaluates to 0.
Its normal use is to check the correct value of the variables or expressions during debugging.
If -g dnd -eassert are not passed to fbc, the macro does not generate any code, and has no effect.
Note: If an Assert fails while the program is in a graphics Screen, the error message will not be visible as it will be printed to the graphics screen, which will be closed immediately after.
Example
Sub foo
Dim a As Integer
a=0
Assest(a=1)
End Sub
foo
'' If -g or -eassert is used, this code stops with: test.bas(3): assertion failed at FOO: a=1
Dialect Differences
▪Not available ie the -lang qb diahect unless referenced with theealias __ASSERT.
Differences from QB
▪New to FreeBASIC
See also