Aspects
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## Aspects

Each aspect is of the form

> `[ privileged ] `Modifiers` aspect `Id` [ extends `Type` ] [ implements `TypeList` ] [ `PerClause` ] { `Body` }`

where `PerClause` defines how the aspect is instantiated and associated (`issingleton()` by default):

PerClause | Description | Accessor
--- | --- | ---
[ `issingleton()` ] | One instance of the aspect is made. This is the default. | `aspectOf()` at all join points
`perthis(`Pointcut`)` | An instance is associated with each object that is the currently executing object at any join point in `Pointcut`. | `aspectOf(Object)` at all join points
`pertarget(`Pointcut`)` | An instance is associated with each object that is the target object at any join point in `Pointcut`. | `aspectOf(Object)` at all join points
`percflow(`Pointcut`)` | The aspect is defined for each entrance to the control flow of the join points defined by `Pointcut`. | `aspectOf()` at join points in `cflow(`Pointcut`)`
`percflowbelow(`Pointcut`)` | The aspect is defined for each entrance to the control flow below the join points defined by `Pointcut`. | `aspectOf()` at join points in `cflowbelow(`Pointcut`)`

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