Remove composition (#39)

Author: mofeing

docs/src/operations.md

@@ -80,23 +80,3 @@ julia> for (x,y) in b; println("$x --> $y"); end
 1 --> alpha
 ```
 
-
-
-
-
-## Composition
-
-Given two `Bijection`s `a` and `b`, their composition `c = a*b` is a new
-`Bijection` with the property that `c[x] = a[b[x]]` for all `x` in the
-domain of `b`.
-
-```
-julia> a = Bijection{Int,Int}(); a[1] = 10; a[2] = 20;
-
-julia> b = Bijection{String,Int}(); b["hi"] = 1; b["bye"] = 2;
-
-julia> c = a * b;
-
-julia> c["hi"]
-10
-```

src/Bijections.jl

@@ -25,12 +25,12 @@ end
 """
     Bijection()
 
-Construct a new `Bijection`. 
+Construct a new `Bijection`.
 
 * `Bijection{S,T}()` creates an empty `Bijection` from objects of type `S` to objects of type `T`. If `S` and `T` are omitted, then we have `Bijection{Any,Any}`.
 * `Bijection(x::S, y::T)` creates a new `Bijection` initialized with `x` mapping to `y`.
-* `Bijection(dict::Dict{S,T})` creates a new `Bijection` based on the mapping in `dict`. 
-* `Bijection(pair_list::Vector{Pair{S,T}})` creates a new `Bijection` using the key/value pairs in `pair_list`. 
+* `Bijection(dict::Dict{S,T})` creates a new `Bijection` based on the mapping in `dict`.
+* `Bijection(pair_list::Vector{Pair{S,T}})` creates a new `Bijection` using the key/value pairs in `pair_list`.
 """
 Bijection() = Bijection{Any,Any}()
 
@@ -269,6 +269,4 @@ function Serialization.deserialize(
     return B(f)
 end
 
-include("composition.jl")
-
 end # end of module Bijections

src/composition.jl

@@ -38,20 +38,6 @@ using Serialization
     @test Bijection(collect(b)) == b
 end
 
-# check composition
-@testset "Composition" begin
-    a = Bijection{Int,Int}()
-    a[1] = 10
-    a[2] = 20
-
-    b = Bijection{String,Int}()
-    b["hi"] = 1
-    b["bye"] = 2
-
-    c = a * b
-    @test c["hi"] == 10
-end
-
 # Test empty constructor
 @testset "empty_constructor" begin
     b = Bijection{Int,String}()