experimental-features.hh

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#pragma once
 
#include "lix/libutil/error.hh"
#include "lix/libutil/json-fwd.hh"
#include "lix/libutil/types.hh"
#include <type_traits>
 
namespace nix {

enum struct ExperimentalFeature
{
    #include "experimental-features.gen.inc"
    NumXpFeatures, // number of available experimental features, do not use
};
 
template<>
struct json::avoids_null<ExperimentalFeature> : std::true_type
{};
 
enum struct ExperimentalFeatures {};
 
inline ExperimentalFeatures operator| (ExperimentalFeatures a, ExperimentalFeatures b) {
    return static_cast<ExperimentalFeatures>(static_cast<size_t>(a) | static_cast<size_t>(b));
}
 
inline ExperimentalFeatures operator| (ExperimentalFeatures a, ExperimentalFeature b) {
    return a | static_cast<ExperimentalFeatures>(1 << static_cast<size_t>(b));
}
 
inline ExperimentalFeatures operator& (ExperimentalFeatures a, ExperimentalFeature b) {
    return static_cast<ExperimentalFeatures>(static_cast<size_t>(a) & (1 << static_cast<size_t>(b)));
}

using Xp = ExperimentalFeature;

const std::optional<ExperimentalFeature> parseExperimentalFeature(
        const std::string_view & name);

std::string_view showExperimentalFeature(const ExperimentalFeature);

std::ostream & operator<<(
        std::ostream & str,
        const ExperimentalFeature & feature);

ExperimentalFeatures parseFeatures(const std::set<std::string> &);

JSON documentExperimentalFeatures();

void to_json(JSON &, const ExperimentalFeature &);
void from_json(const JSON &, ExperimentalFeature &);
 
void to_json(JSON &, const ExperimentalFeatures &);
void from_json(const JSON &, ExperimentalFeatures &);

class MissingExperimentalFeature : public Error
{
public:
    ExperimentalFeature missingFeature;
 
    MissingExperimentalFeature(ExperimentalFeature missingFeature);
};
 
}