Asserts that the [param condition] is [code]true[/code]. If the [param condition] is [code]false[/code], an error is generated. When running from the editor, the running project will also be paused until you resume it. This can be used as a stronger form of [method @GlobalScope.push_error] for reporting errors to project developers or add-on users. An optional [param message] can be shown in addition to the generic "Assertion failed" message. You can use this to provide additional details about why the assertion failed. [b]Warning:[/b] For performance reasons, the code inside [method assert] is only executed in debug builds or when running the project from the editor. Don't include code that has side effects in an [method assert] call. Otherwise, the project will behave differently when exported in release mode. [codeblock] # Imagine we always want speed to be between 0 and 20. var speed = -10 assert(speed < 20) # True, the program will continue. assert(speed >= 0) # False, the program will stop. assert(speed >= 0 and speed < 20) # You can also combine the two conditional statements in one check. assert(speed < 20, "the speed limit is 20") # Show a message. [/codeblock] [b]Note:[/b] [method assert] is a keyword, not a function. So you cannot access it as a [Callable] or use it inside expressions.
None
An optional [param message] can be shown in addition to the generic "Assertion failed" message. You can use this to provide additional details about why the assertion failed.
[b]Warning:[/b] For performance reasons, the code inside [method assert] is only executed in debug builds or when running the project from the editor. Don't include code that has side effects in an [method assert] call. Otherwise, the project will behave differently when exported in release mode.
[codeblock]
# Imagine we always want speed to be between 0 and 20.
var speed = -10
assert(speed < 20) # True, the program will continue.
assert(speed >= 0) # False, the program will stop.
assert(speed >= 0 and speed < 20) # You can also combine the two conditional statements in one check.
assert(speed < 20, "the speed limit is 20") # Show a message.
[/codeblock]
[b]Note:[/b] [method assert] is a keyword, not a function. So you cannot access it as a [Callable] or use it inside expressions.
一般的な "Assertion failed" メッセージに加えて、オプションの [param message] を表示できます。こちらを使用して、アサーションが失敗した理由についての追加詳細を提供することが可能です。
[b]注意:[/b]エディタパフォーマンス上の理由から、[method assert] 内のコードは、デバッグ ビルドで、またはエディターからプロジェクトを実行するときにのみ実行されます。 [method assert] 呼び出しに副作用のあるコードを含めないでください。そうしないと、リリース モードでエクスポートしたときにプロジェクトの動作が異なります。
[codeblock]
# speedを 0 から 20 の間に制限したいとします
var speed = -10
assert(speed < 20) # True プログラムは続行します
assert(speed >= 0) # False プログラムは停止します
assert(speed >= 0 && speed < 20) # ふたつの式をまとめられます
assert(speed < 20, "the speed limit is 20") # メッセージを表示します
[/codeblock]