Merge pull request #346 from traktofon/complex-bswap

Backport bswap method for complex numbers.

README.md

@@ -161,6 +161,8 @@ Currently, the `@compat` macro supports the following syntaxes:
 
 * `unsafe_trunc(::Type{<:Integer}, ::Integer)` is supported on 0.5. ([#18629])
 
+* `bswap` is supported for `Complex` arguments on 0.5 and below. ([#21346])
+
 ## Renamed functions
 
 * `pointer_to_array` and `pointer_to_string` have been replaced with `unsafe_wrap(Array, ...)` and `unsafe_wrap(String, ...)` respectively
@@ -358,3 +360,4 @@ includes this fix. Find the minimum version from there.
 [#20418]: https://github.com/JuliaLang/julia/issues/20418
 [#20500]: https://github.com/JuliaLang/julia/issues/20500
 [#18629]: https://github.com/JuliaLang/julia/pull/18629
+[#21346]: https://github.com/JuliaLang/julia/pull/21346

src/Compat.jl

@@ -1459,6 +1459,11 @@ if VERSION < v"0.6.0-dev.735"
  Base.unsafe_trunc{T<:Integer}(::Type{T}, x::Integer) = rem(x, T)
 end
 
+# https://github.com/JuliaLang/julia/pull/21346
+if VERSION < v"0.6.0-pre.beta.102"
+ Base.bswap(z::Complex) = Complex(bswap(real(z)), bswap(imag(z)))
+end
+
 include("to-be-deprecated.jl")
 
 end # module Compat

test/runtests.jl

@@ -1812,6 +1812,16 @@ end
 @test unsafe_trunc(Int8, 128) === Int8(-128)
 @test_throws InexactError trunc(Int8, 128)
 
+# PR 21346
+let zbuf = IOBuffer([0xbf, 0xc0, 0x00, 0x00, 0x40, 0x20, 0x00, 0x00,
+ 0x40, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0xc0, 0x12, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00])
+ z1 = read(zbuf, Complex64)
+ z2 = read(zbuf, Complex128)
+ @test bswap(z1) === -1.5f0 + 2.5f0im
+ @test bswap(z2) === 3.5 - 4.5im
+end
+
 include("to-be-deprecated.jl")
 
 nothing