boost::gil::operator*

template<typename T>
[[__always_inline__]]
matrix3x2<T>
operator*(
    matrix3x2<T> const& m1,
    matrix3x2<T> const& m2);

template<
    typename T,
    typename M>
[[__always_inline__]]
point<detail::std_common_type<T, M>::type>
operator*(
    M m,
    point<T> const& p)
requires std::is_arithmetic<M>::value;

template<
    typename T,
    typename M>
[[__always_inline__]]
point<detail::std_common_type<T, M>::type>
operator*(
    point<T> const& p,
    M m)
requires std::is_arithmetic<M>::value;

template<
    typename T,
    typename F>
[[__always_inline__]]
point<F>
operator*(
    point<T> const& p,
    matrix3x2<F> const& m);