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/usr/include/bobcat/fswap is in libbobcat-dev 4.01.03-2ubuntu1.

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#ifndef INCLUDED_FSWAP_
#define INCLUDED_FSWAP_

#include <cstring>
#include <cstdint>

namespace FBB
{

class FSwap
{
    template <typename Type>
    friend void fswap(Type &lhs, Type &rhs);

    template <typename Tp, size_t size>
    struct Xch
    {
        static void fswap(Tp &lhs, Tp &rhs);            // 1.f
    };
    
    template <typename Tp>
    struct Xch<Tp, 1>
    {
        static void fswap(Tp &lhs, Tp &rhs);            // 2.f
    };

    template <typename Tp>
    struct Xch<Tp, 2>
    {
        static void fswap(Tp &lhs, Tp &rhs);            // 3.f
    };

    template <typename Tp>
    struct Xch<Tp, 4>
    {
        static void fswap(Tp &lhs, Tp &rhs);            // 4.f
    };

    template <typename Tp>
    struct Xch<Tp, 8>
    {
        static void fswap(Tp &lhs, Tp &rhs);            // 5.f
    };
    
    template <typename SwapType, typename Type>
    static void tswap(Type &lhs, Type &rhs);                // .f
};

template <typename SwapType, typename Type>
void FSwap::tswap(Type &lhs, Type &rhs)
{
    static_assert(sizeof(SwapType) == sizeof(Type),
                "BOBCAT DESIGN ERROR: "
                "FSwap::tswap(): sizeof(SwapType) != sizeof(Type)");

    SwapType tmp = *reinterpret_cast<SwapType *>(&lhs);
    *reinterpret_cast<SwapType *>(&lhs) = *reinterpret_cast<SwapType *>(&rhs);
    *reinterpret_cast<SwapType *>(&rhs) = tmp;
}
template <typename Tp, size_t size>
void FSwap::Xch<Tp, size>::fswap(Tp &lhs, Tp &rhs)
{
    char buffer[size];
    memcpy(buffer,  &lhs,   size);
    memcpy(&lhs,    &rhs,   size);
    memcpy(&rhs,    buffer, size);
}
template <typename Tp>
inline void FSwap::Xch<Tp, 1>::fswap(Tp &lhs, Tp &rhs)
{
    tswap<int8_t>(lhs, rhs);
}
template <typename Tp>
inline void FSwap::Xch<Tp, 2>::fswap(Tp &lhs, Tp &rhs)
{
    tswap<int16_t>(lhs, rhs);
}
template <typename Tp>
inline void FSwap::Xch<Tp, 4>::fswap(Tp &lhs, Tp &rhs)
{
    tswap<int32_t>(lhs, rhs);
}
template <typename Tp>
inline void FSwap::Xch<Tp, 8>::fswap(Tp &lhs, Tp &rhs)
{
    tswap<int64_t>(lhs, rhs);
}

    // Free function
template <typename Type>
void fswap(Type &lhs, Type &rhs)
{
    FSwap::Xch<Type, sizeof(Type)>::fswap(lhs, rhs);
}

} // FBB

#endif