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Add Val(x) #381

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Jul 19, 2017
Merged

Add Val(x) #381

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a3bfce5
Add Val(x)
ararslan Jul 19, 2017
96e1df3
Note Val(x) in the readme [ci skip]
ararslan Jul 19, 2017
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3 changes: 3 additions & 0 deletions README.md
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Expand Up @@ -143,6 +143,8 @@ Currently, the `@compat` macro supports the following syntaxes:

* `@__MODULE__` is aliased to `current_module()` for Julia versions 0.6 and below. Versions of `Base.binding_module`, `expand`, `macroexpand`, and `include_string` were added that accept a module as the first argument. ([#22064])

* `Val(x)` constructs `Val{x}()`. ([#22475])

## Renamed functions


Expand Down Expand Up @@ -283,3 +285,4 @@ includes this fix. Find the minimum version from there.
[#21257]: https://github.com/JuliaLang/julia/issues/21257
[#21346]: https://github.com/JuliaLang/julia/issues/21346
[#22064]: https://github.com/JuliaLang/julia/issues/22064
[#22475]: https://github.com/JuliaLang/julia/issues/22475
6 changes: 6 additions & 0 deletions src/Compat.jl
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Expand Up @@ -607,6 +607,12 @@ if VERSION < v"0.6.0-pre.beta.455"
isless(x::Dates.OtherPeriod, y::Dates.FixedPeriod) = throw(MethodError(isless, (x, y)))
end

# https://github.com/JuliaLang/julia/pull/22475
if VERSION < v"0.7.0-DEV.843"
import Base: Val
(::Type{Val})(x) = (Base.@_pure_meta; Val{x}())
end

include("deprecated.jl")

# https://github.com/JuliaLang/julia/pull/21746
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29 changes: 17 additions & 12 deletions test/runtests.jl
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Expand Up @@ -338,28 +338,33 @@ end
# Val
begin
local firstlast
firstlast(::Type{Val{true}}) = "First"
firstlast(::Type{Val{false}}) = "Last"
firstlast(::Val{true}) = "First"
firstlast(::Val{false}) = "Last"

@test firstlast(Val{true}) == "First"
@test firstlast(Val{false}) == "Last"
@test firstlast(Val(true)) == "First"
@test firstlast(Val(false)) == "Last"
end

# The constructors for some linear algebra stuff changed to take Val{x}
# instead of Type{Val{x}}
const valtrue = VERSION < v"0.7.0-DEV.843" ? Val{true} : Val(true)
const valfalse = VERSION < v"0.7.0-DEV.843" ? Val{false} : Val(false)

# qr, qrfact, qrfact!
let A = [1.0 2.0; 3.0 4.0]
Q, R = qr(A, Val{false})
Q, R = qr(A, valfalse)
@test Q*R ≈ A
Q, R, p = qr(A, Val{true})
Q, R, p = qr(A, valtrue)
@test Q*R ≈ A[:,p]
F = qrfact(A, Val{false})
F = qrfact(A, valfalse)
@test F[:Q]*F[:R] ≈ A
F = qrfact(A, Val{true})
F = qrfact(A, valtrue)
@test F[:Q]*F[:R] ≈ A[:,F[:p]]
A_copy = copy(A)
F = qrfact!(A_copy, Val{false})
F = qrfact!(A_copy, valfalse)
@test F[:Q]*F[:R] ≈ A
A_copy = copy(A)
F = qrfact!(A_copy, Val{true})
F = qrfact!(A_copy, valtrue)
@test F[:Q]*F[:R] ≈ A[:,F[:p]]
end

Expand Down Expand Up @@ -1397,11 +1402,11 @@ for A in (Hermitian(randn(5,5) + 10I),
@test istriu(chol(A))
@test chol(A) ≈ F[:U]

F = cholfact(A, Val{true})
F = cholfact(A, valtrue)
@test F[:U]'F[:U] ≈ A[F[:p], F[:p]]
@test F[:L]*F[:L]' ≈ A[F[:p], F[:p]]
Ac = copy(A)
F = cholfact!(Ac, Val{true})
F = cholfact!(Ac, valtrue)
@test F[:U]'F[:U] ≈ A[F[:p], F[:p]]
@test F[:L]*F[:L]' ≈ A[F[:p], F[:p]]
end
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