compare_proxy: Proxy for waldo comparison

In waldo: Find Differences Between R Objects

Proxy for waldo comparison

Description

Use this generic to override waldo's default comparison if you need to override the defaults (typically because your object stores data in an external pointer).

waldo comes with methods for a few common cases:

• data.table: the .internal.selfref and index attributes are set to NULL. Both attributes are used for performance optimisation, and don't affect the data.

• xml2::xml_node: the underlying XML data is stored in memory in C, behind an external pointer, so the we best can do is to convert the object to a string.

• Classes from the RProtoBuf package: like XML objects, these store data in memory in C++ and only expose string names to R. Fortunately, these have well-understood string representations that we can use for comparisons. See https://protobuf.dev/reference/cpp/api-docs/google.protobuf.text_format/

Usage

compare_proxy(x, path = "x")

Arguments

x	An object.
path	Path

Value

A list with two components:

• object: the modified object

• path: an updated path showing what modification was applied

waldo documentation built on Nov. 4, 2024, 5:07 p.m.