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Programming-Idioms

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  • Java

Idiom #123 Assert condition

Verify that predicate isConsistent returns true, otherwise report assertion violation.
Explain if the assertion is executed even in production environment or not.

assert isConsistent() : "State consistency violated";

This throws an AssertionError when then condition is false.
By default, assertions are disabled at runtime.
Use java switch -enableassertions or -ea.
#include <assert.h>
assert(isConsistent());

If NDEBUG is defined, the assert macro becomes void. Therefore, such expressions must not have side effects.
New implementation...
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programming-idioms.org 
assert isConsistent() : "State consistency violated";
assert(isConsistent());
(assert (true? (isConsistent)))
(assert (isConsistent))
assert(isConsistent());
var result = isConsistent();
Debug.Assert(result);
var result = isConsistent();
Trace.Assert(result);
assert(isConsistent);
assert(isConsistent);
if (.not. isconsistent) stop "Inconsistent state"
if !isConsistent() {
	panic("State consistency violated")
}
assert isConsistent()
let x' = assert isConsistent x
console.assert(_isConsistent);

(assert (isConsistent))
assert(isConsistent() , "Assertion violation") 
assert(_isConsistent);
{$ASSERTIONS ON}
Assert(isConsistent,'isConsistent assertion failed.');
assert { is_consistent };
assert isConsistent
raise unless isConsistent
assert!(is_consistent);