treat dot operators as dot calls, e.g. x .+ y --> (+).(x,y)

syntax deprecation for .op method definitions, and removed these deprecations from Base

use range + 1, not range .+ 1, to make sure we call the specialized + method that produces a range (not an array)

add depwarn for using .+ etc as function objects

support dotted pipe operators

eliminate most broadcast(::typeof(func), ...) methods, since fusion makes them ~useless; make broadcast produce a BitArray if a Bool array is expected

test for .op loop fusion

docs for new broadcasting dot-operator behavior

define broadcast! earlier (fixes JuliaLang#18462)

use specialized code for non-fusing array ± scalar, for performance

work around slight slowdown in Diagonal due to broadcast vs. broadcast_elwise_op

closes JuliaLang#11053

Author: stevengj

NEWS.md

@@ -7,7 +7,7 @@ New language features
 Language changes
 ----------------
 
-  * Multiline and singleline nonstandard command literals have been added. A
+  * Multi-line and single-line nonstandard command literals have been added. A
     nonstandard command literal is like a nonstandard string literal, but the
     syntax uses backquotes (``` ` ```) instead of double quotes, and the
     resulting macro called is suffixed with `_cmd`. For instance, the syntax
@@ -17,6 +17,11 @@ Language changes
     module. For instance, `Base.r"x"` is now parsed as `Base.@r_str "x"`.
     Previously, this syntax parsed as an implicit multiplication. ([#18690])
 
+  * For every binary operator `⨳`, `a .⨳ b` is now automatically equivalent to
+    the `broadcast` call `(⨳).(a, b)`.  Hence, one no longer defines methods
+    for `.*` etcetera.  This also means that "dot operations" automatically
+    fuse into a single loop, along with other dot calls `f.(x)`. ([#17623])
+
 Breaking changes
 ----------------
 
@@ -34,6 +39,14 @@ This section lists changes that do not have deprecation warnings.
   * `broadcast` now handles tuples, and treats any argument that is not a tuple
     or an array as a "scalar" ([#16986]).
 
+  * `broadcast` now produces a `BitArray` instead of `Array{Bool}` for
+    functions yielding a boolean result.  If you want `Array{Bool}`, use
+    `broadcast!` or `.=` ([#17623]).
+
+  * Operations like `.+` and `.*` on `Range` objects are now generic
+    `broadcast` calls (see above) and produce an `Array`.  If you want
+    a `Range` result, use `+` and `*`, etcetera ([#17623]).
+
 Library improvements
 --------------------
 

base/LineEdit.jl

@@ -437,7 +437,7 @@ function splice_buffer!{T<:Integer}(buf::IOBuffer, r::UnitRange{T}, ins::Abstrac
     elseif pos > last(r)
         seek(buf, pos - length(r))
     end
-    splice!(buf.data, r .+ 1, ins.data) # position(), etc, are 0-indexed
+    splice!(buf.data, r + 1, ins.data) # position(), etc, are 0-indexed
     buf.size = buf.size + sizeof(ins) - length(r)
     seek(buf, position(buf) + sizeof(ins))
 end

base/abstractarraymath.jl

@@ -91,15 +91,6 @@ imag{T<:Real}(x::AbstractArray{T}) = zero(x)
 +{T<:Number}(x::AbstractArray{T}) = x
 *{T<:Number}(x::AbstractArray{T,2}) = x
 
-## Binary arithmetic operators ##
-
-*(A::Number, B::AbstractArray) = A .* B
-*(A::AbstractArray, B::Number) = A .* B
-
-/(A::AbstractArray, B::Number) = A ./ B
-
-\(A::Number, B::AbstractArray) = B ./ A
-
 # index A[:,:,...,i,:,:,...] where "i" is in dimension "d"
 
 """

base/arraymath.jl

@@ -60,10 +60,10 @@ end
 promote_array_type(F, ::Type, ::Type, T::Type) = T
 promote_array_type{S<:Real, A<:AbstractFloat}(F, ::Type{S}, ::Type{A}, ::Type) = A
 promote_array_type{S<:Integer, A<:Integer}(F, ::Type{S}, ::Type{A}, ::Type) = A
-promote_array_type{S<:Integer, A<:Integer}(::typeof(./), ::Type{S}, ::Type{A}, T::Type) = T
-promote_array_type{S<:Integer, A<:Integer}(::typeof(.\), ::Type{S}, ::Type{A}, T::Type) = T
-promote_array_type{S<:Integer}(::typeof(./), ::Type{S}, ::Type{Bool}, T::Type) = T
-promote_array_type{S<:Integer}(::typeof(.\), ::Type{S}, ::Type{Bool}, T::Type) = T
+promote_array_type{S<:Integer, A<:Integer}(::typeof(/), ::Type{S}, ::Type{A}, T::Type) = T
+promote_array_type{S<:Integer, A<:Integer}(::typeof(\), ::Type{S}, ::Type{A}, T::Type) = T
+promote_array_type{S<:Integer}(::typeof(/), ::Type{S}, ::Type{Bool}, T::Type) = T
+promote_array_type{S<:Integer}(::typeof(\), ::Type{S}, ::Type{Bool}, T::Type) = T
 promote_array_type{S<:Integer}(F, ::Type{S}, ::Type{Bool}, T::Type) = T
 
 for f in (:+, :-, :div, :mod, :&, :|, :xor)
@@ -89,9 +89,9 @@ function _elementwise{T}(op, ::Type{T}, A::AbstractArray, B::AbstractArray)
     return F
 end
 
-for f in (:.+, :.-, :.*, :./, :.\, :.^, :.÷, :.%, :.<<, :.>>, :div, :mod, :rem, :&, :|, :xor)
-    @eval begin
-        function ($f){T}(A::Number, B::AbstractArray{T})
+for f in (:div, :mod, :rem, :&, :|, :xor, :/, :\, :*, :+, :-)
+    if f != :/
+        @eval function ($f){T}(A::Number, B::AbstractArray{T})
             R = promote_op($f, typeof(A), T)
             S = promote_array_type($f, typeof(A), T, R)
             S === Any && return [($f)(A, b) for b in B]
@@ -108,7 +108,9 @@ for f in (:.+, :.-, :.*, :./, :.\, :.^, :.÷, :.%, :.<<, :.>>, :div, :mod, :rem,
             end
             return F
         end
-        function ($f){T}(A::AbstractArray{T}, B::Number)
+    end
+    if f != :\
+        @eval function ($f){T}(A::AbstractArray{T}, B::Number)
             R = promote_op($f, T, typeof(B))
             S = promote_array_type($f, typeof(B), T, R)
             S === Any && return [($f)(a, B) for a in A]
@@ -128,16 +130,6 @@ for f in (:.+, :.-, :.*, :./, :.\, :.^, :.÷, :.%, :.<<, :.>>, :div, :mod, :rem,
     end
 end
 
-# familiar aliases for broadcasting operations of array ± scalar (#7226):
-(+)(A::AbstractArray{Bool},x::Bool) = A .+ x
-(+)(x::Bool,A::AbstractArray{Bool}) = x .+ A
-(-)(A::AbstractArray{Bool},x::Bool) = A .- x
-(-)(x::Bool,A::AbstractArray{Bool}) = x .- A
-(+)(A::AbstractArray,x::Number) = A .+ x
-(+)(x::Number,A::AbstractArray) = x .+ A
-(-)(A::AbstractArray,x::Number) = A .- x
-(-)(x::Number,A::AbstractArray) = x .- A
-
 ## data movement ##
 
 function flipdim{T}(A::Array{T}, d::Integer)

base/bitarray.jl

@@ -1136,9 +1136,6 @@ function empty!(B::BitVector)
     return B
 end
 
-## Misc functions
-broadcast(::typeof(abs), B::BitArray) = copy(B)
-
 ## Unary operators ##
 
 function (-)(B::BitArray)
@@ -1232,35 +1229,6 @@ for f in (:+, :-)
     end
 end
 
-for (f) in (:.+, :.-)
-    for (arg1, arg2, T, t) in ((:(B::BitArray), :(x::Bool)    , Int               , (:b, :x)),
-                               (:(B::BitArray), :(x::Number)  , :(Bool, typeof(x)), (:b, :x)),
-                               (:(x::Bool)    , :(B::BitArray), Int               , (:x, :b)),
-                               (:(x::Number)  , :(B::BitArray), :(typeof(x), Bool), (:x, :b)))
-        @eval function ($f)($arg1, $arg2)
-            $(if T === Int
-                quote
-                    r = Array{Int}(size(B))
-                end
-            else
-                quote
-                    T = promote_op($f, $(T.args[1]), $(T.args[2]))
-                    T === Any && return [($f)($(t[1]), $(t[2])) for b in B]
-                    r = Array{T}(size(B))
-                end
-            end)
-            bi = start(B)
-            ri = 1
-            while !done(B, bi)
-                b, bi = next(B, bi)
-                @inbounds r[ri] = ($f)($(t[1]), $(t[2]))
-                ri += 1
-            end
-            return r
-        end
-    end
-end
-
 for f in (:/, :\)
     @eval begin
         ($f)(A::BitArray, B::BitArray) = ($f)(Array(A), Array(B))
@@ -1359,71 +1327,6 @@ for f in (:&, :|, :xor)
     end
 end
 
-function (.^)(B::BitArray, x::Bool)
-    x ? copy(B) : trues(size(B))
-end
-function (.^)(x::Bool, B::BitArray)
-    x ? trues(size(B)) : ~B
-end
-function (.^)(x::Number, B::BitArray)
-    z = x ^ false
-    u = x ^ true
-    reshape([ B[i] ? u : z for i = 1:length(B) ], size(B))
-end
-function (.^)(B::BitArray, x::Integer)
-    x == 0 && return trues(size(B))
-    x < 0 && throw(DomainError())
-    return copy(B)
-end
-function (.^){T<:Number}(B::BitArray, x::T)
-    x == 0 && return ones(typeof(true ^ x), size(B))
-    T <: Real && x > 0 && return convert(Array{T}, B)
-
-    z = nothing
-    u = nothing
-    zerr = nothing
-    uerr = nothing
-    try
-        z = false^x
-    catch err
-        zerr = err
-    end
-    try
-        u = true^x
-    catch err
-        uerr = err
-    end
-    if zerr === nothing && uerr === nothing
-        t = promote_type(typeof(z), typeof(u))
-    elseif zerr === nothing
-        t = typeof(z)
-    else
-        t = typeof(u)
-    end
-    F = Array{t}(size(B))
-    for i = 1:length(B)
-        if B[i]
-            if uerr === nothing
-                F[i] = u
-            else
-                throw(uerr)
-            end
-        else
-            if zerr === nothing
-                F[i] = z
-            else
-                throw(zerr)
-            end
-        end
-    end
-    return F
-end
-
-(.*)(x::Bool, B::BitArray) = x & B
-(.*)(B::BitArray, x::Bool) = B & x
-(.*)(x::Number, B::BitArray) = x .* Array(B)
-(.*)(B::BitArray, x::Number) = Array(B) .* x
-
 ## promotion to complex ##
 
 # TODO?