f1087e81ec
git-subtree-dir: third_party/unordered_dense git-subtree-split: 231e48c9426bd21c273669e5fdcd042c146975cf
95 lines
2.7 KiB
C++
95 lines
2.7 KiB
C++
#include <ankerl/unordered_dense.h>
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#include <app/doctest.h>
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#include <type_traits>
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namespace {
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struct id {
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uint64_t value{}; // NOLINT
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auto operator==(id const& other) const -> bool {
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return value == other.value;
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}
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};
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struct custom_hash_simple {
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[[nodiscard]] auto operator()(id const& x) const noexcept -> uint64_t {
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return x.value;
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}
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};
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struct custom_hash_avalanching {
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using is_avalanching = void;
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auto operator()(id const& x) const noexcept -> uint64_t {
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return ankerl::unordered_dense::detail::wyhash::hash(x.value);
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}
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};
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struct point {
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int x{}; // NOLINT
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int y{}; // NOLINT
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auto operator==(point const& other) const -> bool {
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return x == other.x && y == other.y;
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}
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};
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struct custom_hash_unique_object_representation {
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using is_avalanching = void;
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[[nodiscard]] auto operator()(point const& f) const noexcept -> uint64_t {
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static_assert(std::has_unique_object_representations_v<point>);
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return ankerl::unordered_dense::detail::wyhash::hash(&f, sizeof(f));
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}
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};
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} // namespace
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template <>
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struct ankerl::unordered_dense::hash<id> {
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using is_avalanching = void;
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[[nodiscard]] auto operator()(id const& x) const noexcept -> uint64_t {
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return detail::wyhash::hash(x.value);
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}
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};
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TYPE_TO_STRING_SET(id);
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TYPE_TO_STRING_SET(id, custom_hash_simple);
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TYPE_TO_STRING_SET(id, custom_hash_avalanching);
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TYPE_TO_STRING_SET(point, custom_hash_unique_object_representation);
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TEST_CASE_SET("custom_hash_simple", id, custom_hash_simple) {
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auto set = set_t();
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set.insert(id{124});
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}
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TEST_CASE_SET("custom_hash_avalanching", id, custom_hash_avalanching) {
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auto set = set_t();
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set.insert(id{124});
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}
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TEST_CASE_SET("custom_hash_unique", point, custom_hash_unique_object_representation) {
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auto set = set_t();
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set.insert(point{123, 321});
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}
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TEST_CASE_SET("custom_hash_default", id) {
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auto set = set_t();
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set.insert(id{124});
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}
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static_assert(
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!ankerl::unordered_dense::detail::is_detected_v<ankerl::unordered_dense::detail::detect_avalanching, custom_hash_simple>);
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static_assert(ankerl::unordered_dense::detail::is_detected_v<ankerl::unordered_dense::detail::detect_avalanching,
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custom_hash_avalanching>);
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static_assert(ankerl::unordered_dense::detail::is_detected_v<ankerl::unordered_dense::detail::detect_avalanching,
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custom_hash_unique_object_representation>);
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static_assert(!ankerl::unordered_dense::detail::is_detected_v<ankerl::unordered_dense::detail::detect_avalanching,
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ankerl::unordered_dense::hash<point>>);
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