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🎨 Allow ct_strings in type_map #425

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Merged
bdeane-intel merged 1 commit into from
Oct 8, 2026
Merged

🎨 Allow ct_strings in type_map #425

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6 changes: 6 additions & 0 deletions include/stdx/ct_string.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -236,5 +236,11 @@ template <typename T> consteval auto name_for() {
template <typename T> consteval auto constant_name_for() {
return cts_t<name_for<T>()>{};
}

namespace detail {
template <std::size_t N>
// NOLINTNEXTLINE(*-avoid-c-arrays)
map_value_helper(char const (&)[N]) -> map_value_helper<ct_string<N>>;
} // namespace detail
} // namespace v1
} // namespace stdx
79 changes: 50 additions & 29 deletions include/stdx/utility.hpp
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Expand Up @@ -24,7 +24,14 @@ template <typename... Fs> overload(Fs...) -> overload<Fs...>;
[[noreturn]] inline auto unreachable() -> void { __builtin_unreachable(); }

namespace detail {
template <auto V> struct value_t {
template <typename T> struct map_value_helper {
consteval explicit(false) map_value_helper(auto t) : value(t) {}

T value;
};
template <typename T> map_value_helper(T) -> map_value_helper<T>;

template <auto V> struct map_value_t {
constexpr static inline auto value = V;
};

Expand All @@ -38,10 +45,13 @@ template <typename K, typename V> struct type_pair {
using value_type = V;
};
template <typename K, typename V> using tt_pair = type_pair<K, V>;
template <auto K, typename V> using vt_pair = tt_pair<detail::value_t<K>, V>;
template <typename K, auto V> using tv_pair = tt_pair<K, detail::value_t<V>>;
template <auto K, auto V>
using vv_pair = tt_pair<detail::value_t<K>, detail::value_t<V>>;
template <detail::map_value_helper K, typename V, typename = void>
using vt_pair = tt_pair<detail::map_value_t<K.value>, V>;
template <typename K, detail::map_value_helper V>
using tv_pair = tt_pair<K, detail::map_value_t<V.value>>;
template <detail::map_value_helper K, detail::map_value_helper V>
using vv_pair =
tt_pair<detail::map_value_t<K.value>, detail::map_value_t<V.value>>;

template <typename... Ts> using type_map = shrink_t<detail::type_map<Ts...>>;

Expand All @@ -57,50 +67,61 @@ template <typename V, typename Default, typename K>
constexpr static auto reverse_lookup(type_pair<K, V>) -> K;
} // namespace detail

template <typename M, typename K, typename Default = void>
struct missing_t {
friend constexpr auto operator==(missing_t const &, missing_t const &)
-> bool = default;
};
constexpr inline auto missing = missing_t{};

template <typename M, typename K, typename Default = missing_t>
using type_lookup_t = decltype(detail::lookup<K, Default>(expand<M>()));

template <typename M, typename V, typename Default = void>
template <typename M, typename V, typename Default = missing_t>
using reverse_type_lookup_t =
decltype(detail::reverse_lookup<V, Default>(expand<M>()));

template <typename M, auto K, typename Default = void>
template <typename M, detail::map_value_helper K, typename Default = missing_t>
using value_lookup_t =
decltype(detail::lookup<detail::value_t<K>, Default>(expand<M>()));
decltype(detail::lookup<detail::map_value_t<K.value>, Default>(
expand<M>()));

template <typename M, auto V, typename Default = void>
template <typename M, detail::map_value_helper V, typename Default = missing_t>
using reverse_value_lookup_t =
decltype(detail::reverse_lookup<detail::value_t<V>, Default>(expand<M>()));
decltype(detail::reverse_lookup<detail::map_value_t<V.value>, Default>(
expand<M>()));

namespace detail {
template <typename T>
using is_not_void = std::bool_constant<not std::is_void_v<T>>;
using is_present = std::bool_constant<not std::same_as<T, missing_t>>;
}

template <typename M, typename K, auto Default = 0>
template <typename M, typename K, detail::map_value_helper Default = missing>
constexpr static auto type_lookup_v =
type_or_t<detail::is_not_void,
decltype(detail::lookup<K, void>(expand<M>())),
detail::value_t<Default>>::value;
type_or_t<detail::is_present,
decltype(detail::lookup<K, missing_t>(expand<M>())),
detail::map_value_t<Default.value>>::value;

template <typename M, typename V, auto Default = 0>
template <typename M, typename V, detail::map_value_helper Default = missing>
constexpr static auto reverse_type_lookup_v =
type_or_t<detail::is_not_void,
decltype(detail::reverse_lookup<V, void>(expand<M>())),
detail::value_t<Default>>::value;
type_or_t<detail::is_present,
decltype(detail::reverse_lookup<V, missing_t>(expand<M>())),
detail::map_value_t<Default.value>>::value;

template <typename M, auto K, auto Default = 0>
template <typename M, detail::map_value_helper K,
detail::map_value_helper Default = missing>
constexpr static auto value_lookup_v =
type_or_t<detail::is_not_void,
decltype(detail::lookup<detail::value_t<K>, void>(expand<M>())),
detail::value_t<Default>>::value;
type_or_t<detail::is_present,
decltype(detail::lookup<detail::map_value_t<K.value>, missing_t>(
expand<M>())),
detail::map_value_t<Default.value>>::value;

template <typename M, auto V, auto Default = 0>
template <typename M, detail::map_value_helper V,
detail::map_value_helper Default = missing>
constexpr static auto reverse_value_lookup_v =
type_or_t<detail::is_not_void,
decltype(detail::reverse_lookup<detail::value_t<V>, void>(
expand<M>())),
detail::value_t<Default>>::value;
type_or_t<detail::is_present,
decltype(detail::reverse_lookup<detail::map_value_t<V.value>,
missing_t>(expand<M>())),
detail::map_value_t<Default.value>>::value;

template <typename T, typename U>
[[nodiscard]] constexpr auto forward_like(U &&u) noexcept -> decltype(auto) {
Expand Down
104 changes: 96 additions & 8 deletions test/type_map.cpp
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
#include <stdx/ct_string.hpp>
#include <stdx/utility.hpp>

#include <catch2/catch_test_macros.hpp>
Expand All @@ -18,7 +19,7 @@ TEST_CASE("look up type in map", "[type map]") {

TEST_CASE("look up type not in map", "[type map]") {
using M = stdx::type_map<stdx::type_pair<A, X>, stdx::type_pair<B, Y>>;
STATIC_REQUIRE(std::is_same_v<stdx::type_lookup_t<M, Z>, void>);
STATIC_REQUIRE(std::is_same_v<stdx::type_lookup_t<M, Z>, stdx::missing_t>);
STATIC_REQUIRE(std::is_same_v<stdx::type_lookup_t<M, Z, int>, int>);
}

Expand All @@ -30,10 +31,23 @@ TEST_CASE("look up type in map (by value)", "[type map]") {

TEST_CASE("look up type not in map (by value)", "[type map]") {
using M = stdx::type_map<stdx::vt_pair<0, X>, stdx::vt_pair<1, Y>>;
STATIC_REQUIRE(std::is_same_v<stdx::value_lookup_t<M, 2>, void>);
STATIC_REQUIRE(std::is_same_v<stdx::value_lookup_t<M, 2>, stdx::missing_t>);
STATIC_REQUIRE(std::is_same_v<stdx::value_lookup_t<M, 2, int>, int>);
}

TEST_CASE("look up type in map (by string value)", "[type map]") {
using M = stdx::type_map<stdx::vt_pair<"A", X>, stdx::vt_pair<"B", Y>>;
STATIC_REQUIRE(std::is_same_v<stdx::value_lookup_t<M, "A">, X>);
STATIC_REQUIRE(std::is_same_v<stdx::value_lookup_t<M, "B">, Y>);
}

TEST_CASE("look up type not in map (by string value)", "[type map]") {
using M = stdx::type_map<stdx::vt_pair<"A", X>, stdx::vt_pair<"B", Y>>;
STATIC_REQUIRE(
std::is_same_v<stdx::value_lookup_t<M, "C">, stdx::missing_t>);
STATIC_REQUIRE(std::is_same_v<stdx::value_lookup_t<M, "C", int>, int>);
}

TEST_CASE("look up value in map (by type)", "[type map]") {
using M = stdx::type_map<stdx::tv_pair<A, 0>, stdx::tv_pair<B, 1>>;
STATIC_REQUIRE(stdx::type_lookup_v<M, A> == 0);
Expand All @@ -42,10 +56,24 @@ TEST_CASE("look up value in map (by type)", "[type map]") {

TEST_CASE("look up value not in map (by type)", "[type map]") {
using M = stdx::type_map<stdx::tv_pair<A, 0>, stdx::tv_pair<B, 1>>;
STATIC_REQUIRE(stdx::type_lookup_v<M, Z> == 0);
STATIC_REQUIRE(stdx::type_lookup_v<M, Z> == stdx::missing);
STATIC_REQUIRE(stdx::type_lookup_v<M, Z, 2> == 2);
}

TEST_CASE("look up string value in map (by type)", "[type map]") {
using namespace stdx::literals;
using M = stdx::type_map<stdx::tv_pair<A, "X">, stdx::tv_pair<B, "Y">>;
STATIC_REQUIRE(stdx::type_lookup_v<M, A> == "X"_cts);
STATIC_REQUIRE(stdx::type_lookup_v<M, B> == "Y"_cts);
}

TEST_CASE("look up string value not in map (by type)", "[type map]") {
using namespace stdx::literals;
using M = stdx::type_map<stdx::tv_pair<A, "X">, stdx::tv_pair<B, "Y">>;
STATIC_REQUIRE(stdx::type_lookup_v<M, Z> == stdx::missing);
STATIC_REQUIRE(stdx::type_lookup_v<M, Z, "Z"> == "Z"_cts);
}

TEST_CASE("look up value in map (by value)", "[type map]") {
using M = stdx::type_map<stdx::vv_pair<0, 10>, stdx::vv_pair<1, 11>>;
STATIC_REQUIRE(stdx::value_lookup_v<M, 0> == 10);
Expand All @@ -54,10 +82,24 @@ TEST_CASE("look up value in map (by value)", "[type map]") {

TEST_CASE("look up value not in map (by value)", "[type map]") {
using M = stdx::type_map<stdx::vv_pair<0, 10>, stdx::vv_pair<1, 11>>;
STATIC_REQUIRE(stdx::value_lookup_v<M, 2> == 0);
STATIC_REQUIRE(stdx::value_lookup_v<M, 2> == stdx::missing);
STATIC_REQUIRE(stdx::value_lookup_v<M, 2, 3> == 3);
}

TEST_CASE("look up string value in map (by string value)", "[type map]") {
using namespace stdx::literals;
using M = stdx::type_map<stdx::vv_pair<"A", "X">, stdx::vv_pair<"B", "Y">>;
STATIC_REQUIRE(stdx::value_lookup_v<M, "A"> == "X"_cts);
STATIC_REQUIRE(stdx::value_lookup_v<M, "B"> == "Y"_cts);
}

TEST_CASE("look up string value not in map (by string value)", "[type map]") {
using namespace stdx::literals;
using M = stdx::type_map<stdx::vv_pair<"A", "X">, stdx::vv_pair<"B", "Y">>;
STATIC_REQUIRE(stdx::value_lookup_v<M, "C"> == stdx::missing);
STATIC_REQUIRE(stdx::value_lookup_v<M, "C", "Z"> == "Z"_cts);
}

TEST_CASE("reverse look up type in map", "[type map]") {
using M = stdx::type_map<stdx::type_pair<A, X>, stdx::type_pair<B, Y>>;
STATIC_REQUIRE(std::is_same_v<stdx::reverse_type_lookup_t<M, X>, A>);
Expand All @@ -66,7 +108,8 @@ TEST_CASE("reverse look up type in map", "[type map]") {

TEST_CASE("reverse look up type not in map", "[type map]") {
using M = stdx::type_map<stdx::type_pair<A, X>, stdx::type_pair<B, Y>>;
STATIC_REQUIRE(std::is_same_v<stdx::reverse_type_lookup_t<M, Z>, void>);
STATIC_REQUIRE(
std::is_same_v<stdx::reverse_type_lookup_t<M, Z>, stdx::missing_t>);
STATIC_REQUIRE(std::is_same_v<stdx::reverse_type_lookup_t<M, Z, int>, int>);
}

Expand All @@ -78,11 +121,26 @@ TEST_CASE("reverse look up type in map (by value)", "[type map]") {

TEST_CASE("reverse look up type not in map (by value)", "[type map]") {
using M = stdx::type_map<stdx::tv_pair<X, 0>, stdx::tv_pair<Y, 1>>;
STATIC_REQUIRE(std::is_same_v<stdx::reverse_value_lookup_t<M, 2>, void>);
STATIC_REQUIRE(
std::is_same_v<stdx::reverse_value_lookup_t<M, 2>, stdx::missing_t>);
STATIC_REQUIRE(
std::is_same_v<stdx::reverse_value_lookup_t<M, 2, int>, int>);
}

TEST_CASE("reverse look up type in map (by string value)", "[type map]") {
using M = stdx::type_map<stdx::tv_pair<X, "A">, stdx::tv_pair<Y, "B">>;
STATIC_REQUIRE(std::is_same_v<stdx::reverse_value_lookup_t<M, "A">, X>);
STATIC_REQUIRE(std::is_same_v<stdx::reverse_value_lookup_t<M, "B">, Y>);
}

TEST_CASE("reverse look up type not in map (by string value)", "[type map]") {
using M = stdx::type_map<stdx::tv_pair<X, "A">, stdx::tv_pair<Y, "B">>;
STATIC_REQUIRE(
std::is_same_v<stdx::reverse_value_lookup_t<M, "C">, stdx::missing_t>);
STATIC_REQUIRE(
std::is_same_v<stdx::reverse_value_lookup_t<M, "C", int>, int>);
}

TEST_CASE("reverse look up value in map (by type)", "[type map]") {
using M = stdx::type_map<stdx::vt_pair<0, A>, stdx::vt_pair<1, B>>;
STATIC_REQUIRE(stdx::reverse_type_lookup_v<M, A> == 0);
Expand All @@ -91,10 +149,24 @@ TEST_CASE("reverse look up value in map (by type)", "[type map]") {

TEST_CASE("reverse look up value not in map (by type)", "[type map]") {
using M = stdx::type_map<stdx::vt_pair<0, A>, stdx::vt_pair<1, B>>;
STATIC_REQUIRE(stdx::reverse_type_lookup_v<M, Z> == 0);
STATIC_REQUIRE(stdx::reverse_type_lookup_v<M, Z> == stdx::missing);
STATIC_REQUIRE(stdx::reverse_type_lookup_v<M, Z, 2> == 2);
}

TEST_CASE("reverse look up string value in map (by type)", "[type map]") {
using namespace stdx::literals;
using M = stdx::type_map<stdx::vt_pair<"A", A>, stdx::vt_pair<"B", B>>;
STATIC_REQUIRE(stdx::reverse_type_lookup_v<M, A> == "A"_cts);
STATIC_REQUIRE(stdx::reverse_type_lookup_v<M, B> == "B"_cts);
}

TEST_CASE("reverse look up string value not in map (by type)", "[type map]") {
using namespace stdx::literals;
using M = stdx::type_map<stdx::vt_pair<"A", A>, stdx::vt_pair<"B", B>>;
STATIC_REQUIRE(stdx::reverse_type_lookup_v<M, Z> == stdx::missing);
STATIC_REQUIRE(stdx::reverse_type_lookup_v<M, Z, "C"> == "C"_cts);
}

TEST_CASE("reverse look up value in map (by value)", "[type map]") {
using M = stdx::type_map<stdx::vv_pair<0, 10>, stdx::vv_pair<1, 11>>;
STATIC_REQUIRE(stdx::reverse_value_lookup_v<M, 10> == 0);
Expand All @@ -103,6 +175,22 @@ TEST_CASE("reverse look up value in map (by value)", "[type map]") {

TEST_CASE("reverse look up value not in map (by value)", "[type map]") {
using M = stdx::type_map<stdx::vv_pair<0, 10>, stdx::vv_pair<1, 11>>;
STATIC_REQUIRE(stdx::reverse_value_lookup_v<M, 2> == 0);
STATIC_REQUIRE(stdx::reverse_value_lookup_v<M, 2> == stdx::missing);
STATIC_REQUIRE(stdx::reverse_value_lookup_v<M, 2, 3> == 3);
}

TEST_CASE("reverse look up string value in map (by string value)",
"[type map]") {
using namespace stdx::literals;
using M = stdx::type_map<stdx::vv_pair<"X", "A">, stdx::vv_pair<"Y", "B">>;
STATIC_REQUIRE(stdx::reverse_value_lookup_v<M, "A"> == "X"_cts);
STATIC_REQUIRE(stdx::reverse_value_lookup_v<M, "B"> == "Y"_cts);
}

TEST_CASE("reverse look up string value not in map (by string value)",
"[type map]") {
using namespace stdx::literals;
using M = stdx::type_map<stdx::vv_pair<"X", "A">, stdx::vv_pair<"Y", "B">>;
STATIC_REQUIRE(stdx::reverse_value_lookup_v<M, "C"> == stdx::missing);
STATIC_REQUIRE(stdx::reverse_value_lookup_v<M, "C", "Z"> == "Z"_cts);
}