ASSERTWARN

• Source: https://www.freebasic.net/wiki/wikka.php?wakka=KeyPgAssertwarn
• Last revised: 2017-07-24

---

Debugging macro that prints a warning if an expression evaluates to 0.

Syntax

` #define ASSERTWARN(expression) if (expression) = 0 then : fb_AssertWarn( FILE, LINE, FUNCTION, #expression ) : end if

`

Usage

` ASSERTWARN( expression )

`

Parameters

expression

Any valid expression. If expression evaluates to 0, a warning message is printed to stderr (console).

Description

The ASSERTWARN macro is intended for use in debugging and works only if the -g option is selected in the FBC command line. In this case it prints a warning message if expression evaluates to 0. It doesn't stop the program execution like ASSERT does.

Its normal use is to check the correct value of the variables during debugging.

If -g is not passed to fbc, the macro does not generate any code.

Examples

start GeSHi

Sub foo
  Dim a As Integer
  a=0
  AssertWarn(a=1)
End Sub

foo

'' If -g is used this code prints: test.bas(3): assertion failed at FOO: a=1

end GeSHi

Dialect Differences

• Not available in the -lang qb dialect unless referenced with the alias __ASSERTWARN.

Differences from QB

• New to FreeBASIC

See also

• ASSERT

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