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Add macro for conditionally choosing code based on Julia version #131

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Add macro for conditionally choosing code based on Julia version #131

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10 changes: 10 additions & 0 deletions src/Compat.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -566,4 +566,14 @@ if VERSION < v"0.4.0-dev+6578"
export ≈, ≉
end

macro julia_geq(ex)
(Base.Meta.isexpr(ex, :if) && length(ex.args) == 3) ||
throw(ArgumentError("invalid syntax"))
version = ex.args[1]
(Base.Meta.isexpr(version, :macrocall) && length(version.args) == 2 && version.args[1] === symbol("@v_str")) ||
throw(ArgumentError("invalid syntax"))
VERSION >= convert(VersionNumber, version.args[2]) ? esc(ex.args[2]) : esc(ex.args[3])
end
export @julia_geq

end # module
6 changes: 6 additions & 0 deletions test/runtests.jl
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Expand Up @@ -420,3 +420,9 @@ Compat.@irrational mathconst_one 1.0 big(1.)
@test [1,2,3] ≈ [1,2,3+1e-9]
@test [0,1] ≈ [1e-9, 1]
@test [0,1] ≉ [1e-3, 1]

passed = false
@julia_geq v"0.1-" ? (passed = true) : error("@julia_geq test failed")
@test passed
passed = false
@julia_geq v"100" ? error("@julia_geq test failed") : (passed = true)