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annotate src/StaticDicts/StaticDicts.jl @ 734:1a8ef927e732 feature/static_dict

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Add test for equality using ===
author Jonatan Werpers <jonatan@werpers.com>
date Wed, 17 Mar 2021 21:24:57 +0100
parents 103f61d09a8b
children 3e0b0b44868e
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1 module StaticDicts
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2
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3 export StaticDict
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4
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5 """
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6 StaticDict{K,V,N}(NTuple{N,Pair{K,V}}) <: AbstractDict
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7
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8 A static dictionary implementing the interface for an `AbstractDict`. A
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9 `StaticDict` is fully immutable and after creation no changes can be made.
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10
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11 The immutable nature means that `StaticDict`s can be compared with `==`, in
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12 constrast to regular `Dict`s or `ImmutableDict`s which can not. (See
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13 https://github.com/JuliaLang/julia/issues/4648 for details)
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14
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15 Lookups are done by linear search.
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16
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17 Duplicate keys are not allowed and an error will be thrown if they are passed
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18 to the constructor.
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19 """
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20 struct StaticDict{K,V,N} <: AbstractDict{K,V}
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21 pairs::NTuple{N,Pair{K,V}}
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22
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23 # TBD: Why doesn't `pairs::NTuple{N,Pair{K,V}}` work?
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24 function StaticDict{K,V,N}(pairs::Tuple) where {K,V,N}
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25 if !allunique(first.(pairs))
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26 throw(ArgumentError("keys must be unique (for now)"))
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27 end
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28
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29 return new{K,V,N}(pairs)
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30 end
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31 end
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32
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33 function StaticDict(pairs::Vararg{Pair})
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34 K = typejoin(firsttype.(pairs)...)
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35 V = typejoin(secondtype.(pairs)...)
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36 N = length(pairs)
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37 return StaticDict{K,V,N}(pairs)
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38 end
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39
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40 function Base.get(d::StaticDict, key, default)
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41 for p ∈ d.pairs # TBD: Is this the best? Should we use the iterator on `d`?
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42 if key == p.first
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43 return p.second
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44 end
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45 end
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46
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47 return default
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48 end
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49
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50 Base.iterate(d::StaticDict) = iterate(d.pairs)
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51 Base.iterate(d::StaticDict, state) = iterate(d.pairs,state)
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53 Base.length(d::StaticDict) = length(d.pairs)
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55
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56 """
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57 merge(d1::StaticDict, d2::StaticDict)
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58
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59 Merge two `StaticDict`. Repeating keys is considered and error. This may
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60 change in a future version.
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61 """
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62 function Base.merge(d1::StaticDict, d2::StaticDict)
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63 return StaticDict(d1.pairs..., d2.pairs...)
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64 end
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65
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66
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67 """
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68 firsttype(::Pair{T1,T2})
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69
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70 The type of the first element in the pair.
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71 """
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72 firsttype(::Pair{T1,T2}) where {T1,T2} = T1
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73
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74 """
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75 secondtype(::Pair{T1,T2})
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76
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77 The type of the secondtype element in the pair.
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78 """
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79 secondtype(::Pair{T1,T2}) where {T1,T2} = T2
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80
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81 end # module