Miscellaneous typedefs and functions

const Vector2{T} = Vector{Vector{T}}

Vector of Vectors.

const IDType = ITensors.IDType

Type of randomly generated id. It is usually UInt64.

const IDTensors = Dict{IDType, ITensor}

Dictionary of key = randomly generated id and value = ITensor objects.

function gen_rand_id()

Generates a random id.

function combineinds(inds::Vector{Index};
                     maxdim::Union{Nothing, Int} = nothing, 
                     maxqnblocks::Union{Nothing, Int} = nothing,
                     kwargs...)

Combine a vector of Index into one (like ITensors.jl's combiner). maxdim is be the maximum dimension of the output Index, maxqnblocks represents maximum number of QN blocks to retain in the output Index.

function indexintersection(inds1::Vector{Index}, inds2::Vector{Index};
                           maxdim::Union{Nothing, Int} = nothing,
                           maxqnblocks::Union{Nothing, Int} = nothing,
                           kwargs...)

Performs set intersection of two vectors of Index. maxdim is be the maximum dimension of the output Index, maxqnblocks represents maximum number of QN blocks to retain in the output Index.