boost::gil::operator==

template<typename T>
bool
operator==(
    point<T> const& p1,
    point<T> const& p2);

template<
    typename Pixel1,
    bool IsPlanar1,
    typename Alloc1,
    typename Pixel2,
    bool IsPlanar2,
    typename Alloc2>
bool
operator==(
    image<Pixel1, IsPlanar1, Alloc1> const& im1,
    image<Pixel2, IsPlanar2, Alloc2> const& im2);

template<
    typename _Key1,
    typename _Tp1,
    typename _Hash1,
    typename _Pred1,
    typename _Alloc1>
bool
operator==(
    histogram const& lhs,
    histogram const& rhs);