ddn.columnar.convert

The cast layer of ddn.df: converting chunks between dtypes (D12; ADR-2026-10-18-05).

Casts are strict by default: out-of-range numeric conversion or an unparsable string throws DataFrameException; with strict = false those elements become null. Nulls are always preserved. INT64 and the temporal kinds reinterpret the physical value (zero copy); STRING renders through to!string and the ddn.datetime formatters.

Copyright

License

BSD-3-Clause

tmpl isReinterpret LargerOf

fn castChunk castKernel castToBoolean castToDate castToDuration castToFloat castToInt castToString castToTemporal fail formatIsoDurationInto inRange parseIsoDate parseIsoDuration putNum unsupported

Functions 16

fnArrayData castChunk(const ArrayData chunk, DataType target, bool strict = true)Casts one chunk to the target dtype.

private fn

ArrayData castKernel(Kind K)(const  ArrayData chunk,  DataType target,
       bool  strict)

private fnvoid fail(bool strict, string what)

private fnvoid unsupported(string from, string to)

private fnArrayData castToBoolean(Kind K, V)(V view, const ArrayData chunk)

private fn

ArrayData castToInt(Kind K,  T,  V)(V view,  const  ArrayData chunk,
       Kind targetKind,  bool  strict)

private fnbool inRange(T, F)(F v) @safe pure nothrow

private fn

ArrayData castToFloat(Kind K,  F,  V)(V view,  const  ArrayData chunk,
       Kind targetKind,  bool  strict)

private fnArrayData castToString(Kind K, V)(V view, const ArrayData chunk)

private fn

ArrayData castToTemporal(Kind K,  V)(V view,  const  ArrayData chunk,
       Kind targetKind,  bool  strict)

private fn

ArrayData castToDate(Kind K,  V)(V view,  const  ArrayData chunk,
       bool  strict)

private fn

ArrayData castToDuration(Kind K,  V)(V view,  const  ArrayData chunk,
       bool  strict)

fnNullable!int parseIsoDate(scope const(char)[] text) @safe pure nothrow

fnNullable!long parseIsoDuration(scope const(char)[] text) @safe pure nothrow

fnchar[] formatIsoDurationInto(long nanos, return char[] buf) @safe pure nothrow

private fnsize_t putNum(return scope char[] buf, size_t at, long v) @safe pure nothrow

Templates 2

tmplisReinterpret(Kind K)

tmplLargerOf(A, B)