NullBroadcasts.jl

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This package defines NullBroadcasted(), which can be added to, subtracted from, or multiplied by any value in a broadcast expression without incurring a runtime performance penalty.

Example

using NullBroadcasts: NullBroadcasted
using Test

x = [1]; y = [1]
a = NullBroadcasted()
@. x = x + a + y
@test x[1] == 2 # passes

x = [1]; y = [1]
@. x = x - a + y
@test x[1] == 2 # passes

@. x = x + (x * a) # equivalent to @. x = x

@. x = x * a # not allowed, errors
@. x = a # not allowed, errors