ClickHouse/dbms/src/Functions/gcd.cpp

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#include <Functions/FunctionFactory.h>
#include <Functions/FunctionBinaryArithmetic.h>
#include <boost/integer/common_factor.hpp>
namespace DB
{
template <typename A, typename B>
struct GCDImpl
{
using ResultType = typename NumberTraits::ResultOfAdditionMultiplication<A, B>::Type;
template <typename Result = ResultType>
static inline Result apply(A a, B b)
{
throwIfDivisionLeadsToFPE(typename NumberTraits::ToInteger<A>::Type(a), typename NumberTraits::ToInteger<B>::Type(b));
throwIfDivisionLeadsToFPE(typename NumberTraits::ToInteger<B>::Type(b), typename NumberTraits::ToInteger<A>::Type(a));
return boost::integer::gcd(
typename NumberTraits::ToInteger<Result>::Type(a),
typename NumberTraits::ToInteger<Result>::Type(b));
}
#if USE_EMBEDDED_COMPILER
static constexpr bool compilable = false; /// exceptions (and a non-trivial algorithm)
#endif
};
struct NameGCD { static constexpr auto name = "gcd"; };
using FunctionGCD = FunctionBinaryArithmetic<GCDImpl, NameGCD, false>;
void registerFunctionGCD(FunctionFactory & factory)
{
factory.registerFunction<FunctionGCD>();
}
}