tron.function: tron - Wrap a function in logging code

In nfultz/tron: Trace logging functions for R

Description

Create a logged copy of a function. Every time the new function is called, all three functions are called in order:

1. pre

2. f

3. post

Usage

## S3 method for class 'function'
.tron(x, pre, post = pre)

## S3 method for class 'function'
.troff(x)

Arguments

x	a function to decorate
pre	a function, to be called before f
post	a function, to be called after f

Details

Wrapped functions carry a “tron” attribute, which can be tested for using is.tron. The original function f can be extracted using troff.

See Also

http://en.wikipedia.org/wiki/Decorator_pattern and memoise for another example of “decorator” functions.

Examples

f <- tron(sum, message)
f(1:10)
is.tron(f)
f <- troff(f)
f(1:10)

nfultz/tron documentation built on May 23, 2019, 4:41 p.m.