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32 lines
1.1 KiB
C++
32 lines
1.1 KiB
C++
#pragma once
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#include <Common/Visitor.h>
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#include <Core/TypeListNumber.h>
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namespace DB::GatherUtils
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{
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template <typename T>
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struct NumericValueSource;
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struct GenericValueSource;
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template <typename ArraySource>
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struct NullableValueSource;
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template <typename Base>
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struct ConstSource;
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using NumericValueSources = typename TypeListMap<NumericValueSource, TypeListNumbers>::Type;
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using BasicValueSources = typename AppendToTypeList<GenericValueSource, NumericValueSources>::Type;
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using NullableValueSources = typename TypeListMap<NullableValueSource, BasicValueSources>::Type;
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using BasicAndNullableValueSources = typename TypeListConcat<BasicValueSources, NullableValueSources>::Type;
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using ConstValueSources = typename TypeListMap<ConstSource, BasicAndNullableValueSources>::Type;
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using TypeListValueSources = typename TypeListConcat<BasicAndNullableValueSources, ConstValueSources>::Type;
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class ValueSourceVisitor : public ApplyTypeListForClass<Visitor, TypeListValueSources>::Type {};
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template <typename Derived>
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class ValueSourceVisitorImpl : public VisitorImpl<Derived, ValueSourceVisitor> {};
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}
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