lbug 0.16.1

An in-process property graph database management system built for query speed and scalability
Documentation 
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#include "function/arithmetic/divide.h"

#include "common/exception/overflow.h"
#include "common/exception/runtime.h"
#include "common/type_utils.h"
#include "function/cast/functions/numeric_limits.h"
#include <format>

namespace lbug {
namespace function {

// reference from duckDB multiply.cpp
template<class SRC_TYPE, class DST_TYPE>
static inline bool tryDivideWithOverflowCheck(SRC_TYPE left, SRC_TYPE right, SRC_TYPE& result) {
    DST_TYPE uresult;
    uresult = static_cast<DST_TYPE>(left) / static_cast<DST_TYPE>(right);
    if (uresult < NumericLimits<SRC_TYPE>::minimum() ||
        uresult > NumericLimits<SRC_TYPE>::maximum()) {
        return false;
    }
    result = static_cast<SRC_TYPE>(uresult);
    return true;
}

struct TryDivide {
    template<class A, class B, class R>
    static inline bool operation(A& left, B& right, R& result);
};

template<>
bool inline TryDivide::operation(uint8_t& left, uint8_t& right, uint8_t& result) {
    return tryDivideWithOverflowCheck<uint8_t, uint16_t>(left, right, result);
}

template<>
bool inline TryDivide::operation(uint16_t& left, uint16_t& right, uint16_t& result) {
    return tryDivideWithOverflowCheck<uint16_t, uint32_t>(left, right, result);
}

template<>
bool inline TryDivide::operation(uint32_t& left, uint32_t& right, uint32_t& result) {
    return tryDivideWithOverflowCheck<uint32_t, uint64_t>(left, right, result);
}

template<>
bool TryDivide::operation(uint64_t& left, uint64_t& right, uint64_t& result) {
    return tryDivideWithOverflowCheck<uint64_t, uint64_t>(left, right, result);
}

template<>
bool inline TryDivide::operation(int8_t& left, int8_t& right, int8_t& result) {
    return tryDivideWithOverflowCheck<int8_t, int16_t>(left, right, result);
}

template<>
bool inline TryDivide::operation(int16_t& left, int16_t& right, int16_t& result) {
    return tryDivideWithOverflowCheck<int16_t, int32_t>(left, right, result);
}

template<>
bool inline TryDivide::operation(int32_t& left, int32_t& right, int32_t& result) {
    return tryDivideWithOverflowCheck<int32_t, int64_t>(left, right, result);
}

template<>
bool TryDivide::operation(int64_t& left, int64_t& right, int64_t& result) {
    if (left == NumericLimits<int64_t>::minimum() && right == -1) {
        return false;
    }
    return tryDivideWithOverflowCheck<int64_t, int64_t>(left, right, result);
}

template<>
void Divide::operation(uint8_t& left, uint8_t& right, uint8_t& result) {
    if (right == 0) {
        throw common::RuntimeException("Divide by zero.");
    }
    if (!TryDivide::operation(left, right, result)) {
        throw common::OverflowException{std::format("Value {} / {} is not within UINT8 range.",
            common::TypeUtils::toString(left), common::TypeUtils::toString(right))};
    }
}

template<>
void Divide::operation(uint16_t& left, uint16_t& right, uint16_t& result) {
    if (right == 0) {
        throw common::RuntimeException("Divide by zero.");
    }
    if (!TryDivide::operation(left, right, result)) {
        throw common::OverflowException{std::format("Value {} / {} is not within UINT16 range.",
            common::TypeUtils::toString(left), common::TypeUtils::toString(right))};
    }
}

template<>
void Divide::operation(uint32_t& left, uint32_t& right, uint32_t& result) {
    if (right == 0) {
        throw common::RuntimeException("Divide by zero.");
    }
    if (!TryDivide::operation(left, right, result)) {
        throw common::OverflowException{std::format("Value {} / {} is not within UINT32 range.",
            common::TypeUtils::toString(left), common::TypeUtils::toString(right))};
    }
}

template<>
void Divide::operation(uint64_t& left, uint64_t& right, uint64_t& result) {
    if (right == 0) {
        throw common::RuntimeException("Divide by zero.");
    }
    if (!TryDivide::operation(left, right, result)) {
        throw common::OverflowException{std::format("Value {} / {} is not within UINT64 range.",
            common::TypeUtils::toString(left), common::TypeUtils::toString(right))};
    }
}

template<>
void Divide::operation(int8_t& left, int8_t& right, int8_t& result) {
    if (right == 0) {
        throw common::RuntimeException("Divide by zero.");
    }
    if (!TryDivide::operation(left, right, result)) {
        throw common::OverflowException{std::format("Value {} / {} is not within INT8 range.",
            common::TypeUtils::toString(left), common::TypeUtils::toString(right))};
    }
}

template<>
void Divide::operation(int16_t& left, int16_t& right, int16_t& result) {
    if (right == 0) {
        throw common::RuntimeException("Divide by zero.");
    }
    if (!TryDivide::operation(left, right, result)) {
        throw common::OverflowException{std::format("Value {} / {} is not within INT16 range.",
            common::TypeUtils::toString(left), common::TypeUtils::toString(right))};
    }
}

template<>
void Divide::operation(int32_t& left, int32_t& right, int32_t& result) {
    if (right == 0) {
        throw common::RuntimeException("Divide by zero.");
    }
    if (!TryDivide::operation(left, right, result)) {
        throw common::OverflowException{std::format("Value {} / {} is not within INT32 range.",
            common::TypeUtils::toString(left), common::TypeUtils::toString(right))};
    }
}

template<>
void Divide::operation(int64_t& left, int64_t& right, int64_t& result) {
    if (right == 0) {
        throw common::RuntimeException("Divide by zero.");
    }
    if (!TryDivide::operation(left, right, result)) {
        throw common::OverflowException{std::format("Value {} / {} is not within INT64 range.",
            common::TypeUtils::toString(left), common::TypeUtils::toString(right))};
    }
}

} // namespace function
} // namespace lbug