Data commit

Task/Queue-Definition/Julia/queue-definition.julia

@@ -0,0 +1,24 @@
+struct Queue{T}
+    a::Array{T,1}
+end
+
+Queue() = Queue(Any[])
+Queue(a::DataType) = Queue(a[])
+Queue(a) = Queue(typeof(a)[])
+
+Base.isempty(q::Queue) = isempty(q.a)
+
+function Base.pop!(q::Queue{T}) where {T}
+    !isempty(q) || error("queue must be non-empty")
+    pop!(q.a)
+end
+
+function Base.push!(q::Queue{T}, x::T) where {T}
+    pushfirst!(q.a, x)
+    return q
+end
+
+function Base.push!(q::Queue{Any}, x::T) where {T}
+    pushfirst!(q.a, x)
+    return q
+end