Merge pull request #344 from JuliaLang/teh/unsafe_trunc

Support unsafe_trunc(::Type{<:Integer}, ::Integer)

README.md

@@ -157,6 +157,8 @@ Currently, the `@compat` macro supports the following syntaxes:
 
 * `convert` can convert between different `Set` types on 0.5 and below. ([#18727])
 
+* `unsafe_trunc(::Type{<:Integer}, ::Integer)` is supported on 0.5. ([#18629])
+
 ## Renamed functions
 
 * `pointer_to_array` and `pointer_to_string` have been replaced with `unsafe_wrap(Array, ...)` and `unsafe_wrap(String, ...)` respectively
@@ -352,3 +354,4 @@ includes this fix. Find the minimum version from there.
 [#20414]: https://github.com/JuliaLang/julia/issues/20414
 [#20418]: https://github.com/JuliaLang/julia/issues/20418
 [#20500]: https://github.com/JuliaLang/julia/issues/20500
+[#18629]: https://github.com/JuliaLang/julia/pull/18629

src/Compat.jl

@@ -1450,6 +1450,10 @@ if VERSION < v"0.6.0-dev.838"
  Base.convert{T}(::Type{Set{T}}, s::Set) = Set{T}(s)
 end
 
+if VERSION < v"0.6.0-dev.735"
+ Base.unsafe_trunc{T<:Integer}(::Type{T}, x::Integer) = rem(x, T)
+end
+
 include("to-be-deprecated.jl")
 
 end # module Compat

test/runtests.jl

@@ -1805,6 +1805,9 @@ let
  @test cssset == Set(["foo", "bar"])
 end
 
+@test unsafe_trunc(Int8, 128) === Int8(-128)
+@test_throws InexactError trunc(Int8, 128)
+
 include("to-be-deprecated.jl")
 
 nothing