如何使用“new（....）”在Julia的类型定义中？

Question

type GenConfig
    outputPath::String
    mode::String # "all" or "calls"

    # output file names
    ambsFilename::String
    arcsFilename::String
    callsFilename::String
    hospitalsFilename::String
    mapFilename::String
    nodesFilename::String
    prioritiesFilename::String
    stationsFilename::String
    travelFilename::String

    # counts
    numAmbs::Int
    numCalls::Int
    numHospitals::Int
    numStations::Int

    # graph
    xNodes::Int # number of nodes in x direction
    yNodes::Int # number of nodes in y direction

    # map
    map::Map
    mapTrim::Float # fraction of map border to trim, to make sure   objects generated on map are inside borders

    # misc
    startTime::Float
    targetResponseTime::Float
    offRoadSpeed::Float
    stationCapacity::Int
    travelModeSpeeds::Vector{Float}

    # call density raster
    callDensityRasterFilename::String
    cropRaster::Bool
    callRasterCellSeed::Int # seed for rng, will generate raster cell index
    callRasterCellLocSeed::Int # seed for rng, will generate location within raster cell

    # call related distributions and random number generators
    interarrivalTimeDistrRng::DistrRng
    priorityDistrRng::DistrRng
    dispatchDelayDistrRng::DistrRng
    onSceneDurationDistrRng::DistrRng
    transferDistrRng::DistrRng
    transferDurationDistrRng::DistrRng

    # misc RNGs
    ambStationRng::AbstractRNG
    callLocRng::AbstractRNG
    hospitalLocRng::AbstractRNG
    stationLocRng::AbstractRNG

    travelTimeFactorDistrRng::DistrRng

    GenConfig() = new("", "",
        "", "", "", "", "", "", "", "", "",
        nullIndex, nullIndex, nullIndex, nullIndex,
        nullIndex, nullIndex,
        Map(), 1e-6,
        nullTime, nullTime, nullTime, nullIndex, [],
        "", false, nullIndex, nullIndex)
end

Answer 1

您可以使用比字段数少的参数调用new，以获得未完全初始化的对象。

正如Julia手册的不完全初始化部分所解释的那样，这是有意的。

当（引用手册）：

julia> mutable struct Lazy
           data
           Lazy(v) = complete_me(new(), v)
       end