JSConvertOp 编辑

JSConvertOp is the type of JSClass.convert.

Syntax

typedef bool
(* JSConvertOp)(JSContext *cx, JS::HandleObject obj, JSType type,
                JS::MutableHandleValue vp);

Description

JSConvertOp callback specifies conversion behavior for objects having this class, implementing the ECMAScript [[DefaultValue]] behavior for them. On success it must return a primitive value in *vp.

Implementations of this hook have historically been required to accept any type. However, the engine itself only requires support for JSTYPE_STRING, JSTYPE_NUMBER, and JSTYPE_VOID, if JS_ConvertValue is not used. If you do not use the JS_ConvertValue method, you may omit support for other types. (Support for the other types may eventually be removed.)

The callback returns true to indicate success or false to indicate failure.

JSClass hooks

JSClass offers the following hook:

• The JSClass.convert callback implements the [[DefaultValue]] behavior for objects having that class.

See Also

• MXR ID Search for JSConvertOp
• JSClass