functionStatic false positive

[CJ Wood]

I see a false positive running cppcheck 2.22.0 against the following code. Note the function itself cannot be static because it's an explicit member function (deducing this).

#include <array>
#include <cstddef>
#include <ranges>
#include <span>

constexpr std::size_t GridSize{19};

class board
{
public:
    auto rows(this auto&& self)
    {
        auto* cells = self.data.data();
        return std::views::iota(0zu, GridSize)
            | std::views::transform([cells](std::size_t row) {
                return std::span{cells + row * GridSize, GridSize};
            });
    }

private:
    std::array<int, GridSize * GridSize> data{};
};

int main()
{
    board value;
    const auto rows = value.rows();
    const auto firstRow = *rows.begin();
    (void)firstRow;
}

cppcheck output:

cppcheck_deducing_this_rows.cpp:11:10: style: The member function 'board::rows' can be static. [functionStatic]
    auto rows(this auto&& self)
         ^

[CHR]

Thanks for reporting, ticket is here: https://trac.cppcheck.net/ticket/15089