Class decay_array

test/doctest.h:1313–1313

    // clang-format off
#ifdef DOCTEST_CONFIG_TREAT_CHAR_STAR_AS_STRING
    template<class T>               struct decay_array       { using type = T; };
    template<class T, unsigned N>   struct decay_array<T[N]> { using type = T*; };
    template<class T>               struct decay_array<T[]>  { using type = T*; };