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Developer tool: instrument an array source

Source: R/array-source.R
counting_source.Rd

counting_source() records numerical reads without placing a mutable environment inside the source descriptor. It is exported for backend and downstream conformance suites, not as an application data source.

Usage

counting_source(source)

source_counts(x)

reset_source_counts(x)

Arguments

source

An array source.

x

A counting source.

Value

A serializable instrumented source.

Details

This is developer-only test instrumentation. The counter registry is process-local, is not persisted with the descriptor, and must not be used as provenance or as an execution receipt.

Examples

src <- counting_source(memory_source(matrix(seq_len(6), nrow = 2)))
source_read(src, observations = 1)
#>      [,1] [,2] [,3]
#> [1,]    1    3    5
source_counts(src)$reads
#> [1] 1