https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93083
Martijn Otto <martijntje at martijnotto dot nl> changed:
What |Removed |Added
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CC| |martijntje at martijnotto dot
nl
--- Comment #1 from Martijn Otto <martijntje at martijnotto dot nl> ---
The problem with deducing N is a stubborn one. I have run into the same issue
and tried to fix it by adding a constexpr size() method to explicitly provide
the size, but it doesn't seem to help and fails with the same error message
about being unable to deduce N:
template<unsigned N>
struct FixedString
{
char buf[N + 1]{};
constexpr FixedString(char const* s) {
for (unsigned i = 0; i != N; ++i) buf[i] = s[i];
}
auto operator<=>(const FixedString&) const = default;
constexpr operator char const*() const { return buf; }
constexpr static unsigned size() noexcept { return N; }
};
template<unsigned N> FixedString(char const (&)[N]) -> FixedString<N - 1>;
template <FixedString... names>
struct name_list
{
template <FixedString name>
using add_name = name_list<
names...,
FixedString<name.size()>{ name }
>;
};
int main()
{
using names =
name_list<>
::add_name<"Zaphod Beeblebrox">;
}
