R: Classes Used Internally to Control Tracing

TraceClasses {methods} | R Documentation

## Classes Used Internally to Control Tracing

### Description

The classes described here are used by the R function `trace` to create versions of functions and methods including browser calls, etc., and also to `untrace` the same objects.

### Usage

    ### Objects from the following classes are generated
    ### by calling trace() on an object from the corresponding
    ### class without the "WithTrace" in the name.

    "functionWithTrace"
    "MethodDefinitionWithTrace"
    "MethodWithNextWithTrace"
    "genericFunctionWithTrace"
    "groupGenericFunctionWithTrace"

    ### the following is a virtual class extended by each of the
    ### classes above

    "traceable"

### Objects from the Class

Objects will be created from these classes by calls to `trace`. (There is an `initialize` method for class `"traceable"`, but you are unlikely to need it directly.)

### Slots

`.Data`:

  The data part, which will be `"function"` for class `"functionWithTrace"`, and similarly for the other classes.

`original`:

  Object of the original class; e.g., `"function"` for class `"functionWithTrace"`.

### Extends

Each of the classes extends the corresponding untraced class, from the data part; e.g., `"functionWithTrace"` extends `"function"`. Each of the specific classes extends `"traceable"`, directly, and class `"VIRTUAL"`, by class `"traceable"`.

### Methods

The point of the specific classes is that objects generated from them, by function `trace()`, remain callable or dispatchable, in addition to their new trace information.

### See Also

function `trace`

[Package methods version 2.15.1 Index]