element_of.h

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#pragma once
 
#include "zeroerr/domains/domain.h"
#include "zeroerr/internal/config.h"
 
ZEROERR_SUPPRESS_COMMON_WARNINGS_PUSH
 
namespace zeroerr {

template <typename T>
class ElementOf : public Domain<T, uint64_t> {
public:
    using ValueType  = T;
    using CorpusType = uint64_t;
 
    std::vector<T> elements;
 
    ElementOf(std::vector<T> elements) : elements(std::move(elements)) {
        if (this->elements.empty()) throw std::invalid_argument("ElementOf requires elements");
    }
 
    CorpusType GetRandomCorpus(Rng& rng) const override { return rng.bounded(elements.size()); }
 
    ValueType GetValue(const CorpusType& v) const override { return elements[v]; }
 
    CorpusType FromValue(const ValueType& v) const override {
        for (size_t i = 0; i < elements.size(); i++) {
            if (elements[i] == v) return i;
        }
        return 0;
    }
 
    void Mutate(Rng& rng, CorpusType& v, bool only_shrink) const override {
        if (elements.size() <= 1) return;
        if (only_shrink) {
            v = rng.bounded(v);
        } else {
            v = rng.bounded(elements.size());
        }
    }
};
 
}  // namespace zeroerr
 
ZEROERR_SUPPRESS_COMMON_WARNINGS_POP