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48 lines
1.2 KiB
C++
48 lines
1.2 KiB
C++
#include <Functions/FunctionConstantBase.h>
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#include <DataTypes/DataTypesNumber.h>
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namespace DB
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{
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namespace
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{
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template <typename Impl>
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class FunctionMathConstFloat64 : public FunctionConstantBase<FunctionMathConstFloat64<Impl>, Float64, DataTypeFloat64>
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{
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public:
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static constexpr auto name = Impl::name;
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static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionMathConstFloat64>(); }
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FunctionMathConstFloat64() : FunctionConstantBase<FunctionMathConstFloat64<Impl>, Float64, DataTypeFloat64>(Impl::value) {}
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};
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struct EImpl
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{
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static constexpr char name[] = "e";
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static constexpr double value = 2.7182818284590452353602874713526624977572470;
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};
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using FunctionE = FunctionMathConstFloat64<EImpl>;
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struct PiImpl
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{
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static constexpr char name[] = "pi";
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static constexpr double value = 3.1415926535897932384626433832795028841971693;
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};
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using FunctionPi = FunctionMathConstFloat64<PiImpl>;
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}
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REGISTER_FUNCTION(E)
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{
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factory.registerFunction<FunctionE>();
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}
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REGISTER_FUNCTION(Pi)
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{
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factory.registerFunction<FunctionPi>({}, FunctionFactory::CaseInsensitive);
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}
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}
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