Exception Handling

Exception Handling (Error Runtime Handling)

An exception is an error occurs in the runtime (the excution) of program. The CGScript language uses the try/catch statement and the throw expression to implement the exception handling.

Syntax

try-catch statement

try {
   // codes that could throw an exception
}
catch (exception) {
   // codes that execute when exception is thrown in the try block
}

• In the try clause, when a line of code cause the exception/error, the exception will be thrown to the catch clause and the codes in catch clause will process that exception. All codes below the code which cause the exception/error will be ignored.
• The exception can be any type (E.g. exception object, number, string...)
• CGScript language does not support multi catch clauses.

throw expression

throw [expression]

• The expression can be any type (E.g. exception object, number, string...)
• Used in try-catch statement only.
• If throw is used in catch clause, it will be re-throw. See below examples for information about re-throw.