Blank.cpp

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/*
 * This file is part of KnowRob, please consult
 * https://github.com/knowrob/knowrob for license details.
 */
 
#include <optional>
#include "knowrob/terms/Blank.h"
#include "knowrob/integration/python/utils.h"
 
using namespace knowrob;
 
std::shared_ptr<knowrob::Blank> Blank::Tabled(std::string_view name) {
    auto it = Atom::table().find(name);
    if (it != table().end()) {
        if (auto atomPtr = it->second.value().lock()) {
            if (atomPtr->isBlank()) {
                return std::static_pointer_cast<Blank>(atomPtr);
            }
        }
    }
    // Atom does not exist or was destroyed, create a new one
    auto inserted = table().emplace(name, std::nullopt);
    auto &jt = inserted.first;
    auto atom = std::make_shared<knowrob::Blank>(jt->first);
    jt->second = atom;
    auto locked = jt->second.value().lock();
    if (!locked) {
        throw std::runtime_error("Failed to lock Blank");
    }
    return std::static_pointer_cast<Blank>(locked);
}
 
namespace knowrob::py {
    template<>
    void createType<Blank>() {
        using namespace boost::python;
        class_<Blank, std::shared_ptr<Blank>, bases<Atom, RDFNode>>
                ("Blank", init<std::string_view>());
    }
}