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add zeros! and ones!, mutating versions of zeros and ones #40614

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add zeros! and ones!, mutating versions of zeros and ones #40614

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22 changes: 22 additions & 0 deletions base/abstractarray.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -1135,6 +1135,28 @@ copymutable(itr) = collect(itr)

zero(x::AbstractArray{T}) where {T} = fill!(similar(x), zero(T))

"""
zeros!(x::AbstractArray)

Fills `x` with zeros. This is equivalent to `fill!(x, zero(eltype(x)))`.
See also [`zeros`](@ref) and [`ones!`](@ref).

!!! compat "Julia 1.7"
This method is available as of Julia 1.7.
"""
zeros!(x::AbstractArray) = fill!(x, zero(eltype(x)))

"""
ones!(x::AbstractArray)

Fills `x` with ones. This is equivalent to `fill!(x, one(eltype(x)))`.
See also [`ones`](@ref) and [`zeros!`](@ref).

!!! compat "Julia 1.7"
This method is available as of Julia 1.7.
"""
ones!(x::AbstractArray) = fill!(x, one(eltype(x)))

## iteration support for arrays by iterating over `eachindex` in the array ##
# Allows fast iteration by default for both IndexLinear and IndexCartesian arrays

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2 changes: 2 additions & 0 deletions base/exports.jl
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Expand Up @@ -410,6 +410,7 @@ export
minmax,
ndims,
ones,
ones!,
parent,
parentindices,
partialsort,
Expand Down Expand Up @@ -447,6 +448,7 @@ export
vec,
view,
zeros,
zeros!,

# search, find, match and related functions
contains,
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2 changes: 2 additions & 0 deletions doc/src/base/arrays.md
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Expand Up @@ -32,7 +32,9 @@ Base.StridedMatrix
Base.StridedVecOrMat
Base.getindex(::Type, ::Any...)
Base.zeros
Base.zeros!
Base.ones
Base.ones!
Base.BitArray
Base.BitArray(::UndefInitializer, ::Integer...)
Base.BitArray(::Any)
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4 changes: 2 additions & 2 deletions stdlib/Random/src/RNGs.jl
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Expand Up @@ -207,8 +207,8 @@ end

function reset_caches!(r::MersenneTwister)
# zeroing the caches makes comparing two MersenneTwister RNGs easier
fill!(r.vals, 0.0)
fill!(r.ints, zero(UInt128))
zeros!(r.vals)
zeros!(r.ints)
mt_setempty!(r)
mt_setempty!(r, UInt128)
r.adv_vals = -1
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