Add news, test, doc

JuliaLang · Feb 14, 2019 · 44676fc · 44676fc
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diff --git a/NEWS.md b/NEWS.md
@@ -38,6 +38,7 @@ Standard library changes
 * `hasmethod` can now check for matching keyword argument names ([#30712]).
 * `startswith` and `endswith` now accept a `Regex` for the second argument ([#29790]).
 * `retry` supports arbitrary callable objects ([#30382]).
+* A no-argument construct to `Ptr{T}` has been added which constructs a null pointer ([#30919])
 
 #### LinearAlgebra
 

diff --git a/base/boot.jl b/base/boot.jl
@@ -722,7 +722,6 @@ Int64(x::Ptr) = Int64(UInt32(x))
 UInt64(x::Ptr) = UInt64(UInt32(x))
 end
 Ptr{T}(x::Union{Int,UInt,Ptr}) where {T} = bitcast(Ptr{T}, x)
-Ptr{T}() where {T} = Ptr{T}(C_NULL)
 
 Signed(x::UInt8) = Int8(x)
 Unsigned(x::Int8) = UInt8(x)

diff --git a/base/pointer.jl b/base/pointer.jl
@@ -8,6 +8,13 @@ memory is actually valid, or that it actually represents data of the specified t
 """
 Ptr
 
+"""
+ Ptr{T}()
+
+Creates a null pointer to type `T`.
+"""
+Ptr{T}() where {T} = Ptr{T}(C_NULL)
+
 ## converting pointers to an appropriate unsigned ##
 
 """

diff --git a/test/misc.jl b/test/misc.jl
@@ -730,3 +730,6 @@ end
  @test isless(b, a)
  @test sort([a, b]) == [b, a]
 end
+
+# Pointer 0-arg constructor
+@test Ptr{Cvoid}() == C_NULL