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// Copyright 2022 The Dawn & Tint Authors
//
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#ifndef SRC_TINT_UTILS_CONTAINERS_HASHSET_H_
#define SRC_TINT_UTILS_CONTAINERS_HASHSET_H_
#include <stddef.h>
#include <algorithm>
#include <functional>
#include <optional>
#include <tuple>
#include <utility>
#include "src/tint/utils/containers/hashmap.h"
#include "src/tint/utils/containers/vector.h"
namespace tint {
/// An unordered set that uses a robin-hood hashing algorithm.
template <typename KEY, size_t N, typename HASH = Hasher<KEY>, typename EQUAL = std::equal_to<KEY>>
class Hashset : public HashmapBase<KEY, void, N, HASH, EQUAL> {
using Base = HashmapBase<KEY, void, N, HASH, EQUAL>;
using PutMode = typename Base::PutMode;
public:
using Base::Base;
/// Constructor with initializer list of items
/// @param items the items to place into the set
Hashset(std::initializer_list<KEY> items) {
this->Reserve(items.size());
for (auto item : items) {
this->Add(item);
}
}
/// Adds a value to the set, if the set does not already contain an entry equal to `value`.
/// @param value the value to add to the set.
/// @returns true if the value was added, false if there was an existing value in the set.
template <typename V>
bool Add(V&& value) {
struct NoValue {};
return this->template Put<PutMode::kAdd>(std::forward<V>(value), NoValue{});
}
/// @returns the set entries of the map as a vector
/// @note the order of the returned vector is non-deterministic between compilers.
template <size_t N2 = N>
tint::Vector<KEY, N2> Vector() const {
tint::Vector<KEY, N2> out;
out.Reserve(this->Count());
for (auto& value : *this) {
out.Push(value);
}
return out;
}
/// @returns true if the predicate function returns true for any of the elements of the set
/// @param pred a function-like with the signature `bool(T)`
template <typename PREDICATE>
bool Any(PREDICATE&& pred) const {
for (const auto& it : *this) {
if (pred(it)) {
return true;
}
}
return false;
}
/// @returns false if the predicate function returns false for any of the elements of the set
/// @param pred a function-like with the signature `bool(T)`
template <typename PREDICATE>
bool All(PREDICATE&& pred) const {
for (const auto& it : *this) {
if (!pred(it)) {
return false;
}
}
return true;
}
};
} // namespace tint
#endif // SRC_TINT_UTILS_CONTAINERS_HASHSET_H_