DdMetaVariable.cpp

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#include "storm/storage/dd/DdMetaVariable.h"
 
#include "storm/utility/macros.h"
 
namespace storm {
namespace dd {
template<DdType LibraryType>
DdMetaVariable<LibraryType>::DdMetaVariable(std::string const& name, int_fast64_t low, int_fast64_t high, std::vector<Bdd<LibraryType>> const& ddVariables)
    : name(name), type(MetaVariableType::Int), low(low), high(high), ddVariables(ddVariables), lowestIndex(0) {
    this->createCube();
    this->precomputeLowestIndex();
}
 
template<DdType LibraryType>
DdMetaVariable<LibraryType>::DdMetaVariable(MetaVariableType const& type, std::string const& name, std::vector<Bdd<LibraryType>> const& ddVariables)
    : name(name), type(type), low(0), ddVariables(ddVariables), lowestIndex(0) {
    STORM_LOG_ASSERT(type == MetaVariableType::Bool || type == MetaVariableType::BitVector, "Cannot create this type of meta variable in this constructor.");
    if (ddVariables.size() < 63) {
        this->high = (1ull << ddVariables.size()) - 1;
    }
 
    // Correct type in the case of boolean variables.
    if (ddVariables.size() == 1) {
        this->type = MetaVariableType::Bool;
    }
    this->createCube();
    this->precomputeLowestIndex();
}
 
template<DdType LibraryType>
std::string const& DdMetaVariable<LibraryType>::getName() const {
    return this->name;
}
 
template<DdType LibraryType>
MetaVariableType DdMetaVariable<LibraryType>::getType() const {
    return this->type;
}
 
template<DdType LibraryType>
int_fast64_t DdMetaVariable<LibraryType>::getLow() const {
    return this->low;
}
 
template<DdType LibraryType>
int_fast64_t DdMetaVariable<LibraryType>::getHigh() const {
    return this->high.get();
}
 
template<DdType LibraryType>
bool DdMetaVariable<LibraryType>::hasHigh() const {
    return static_cast<bool>(this->high);
}
 
template<DdType LibraryType>
bool DdMetaVariable<LibraryType>::canRepresent(int_fast64_t value) const {
    bool result = value >= this->low;
    if (result && high) {
        return value <= this->high;
    }
    return result;
}
 
template<DdType LibraryType>
std::size_t DdMetaVariable<LibraryType>::getNumberOfDdVariables() const {
    return this->ddVariables.size();
}
 
template<DdType LibraryType>
std::vector<Bdd<LibraryType>> const& DdMetaVariable<LibraryType>::getDdVariables() const {
    return this->ddVariables;
}
 
template<DdType LibraryType>
Bdd<LibraryType> const& DdMetaVariable<LibraryType>::getCube() const {
    return this->cube;
}
 
template<DdType LibraryType>
std::vector<uint64_t> DdMetaVariable<LibraryType>::getIndices(bool sortedByLevel) const {
    std::vector<std::pair<uint64_t, uint64_t>> indicesAndLevels = this->getIndicesAndLevels();
    if (sortedByLevel) {
        std::sort(indicesAndLevels.begin(), indicesAndLevels.end(),
                  [](std::pair<uint64_t, uint64_t> const& a, std::pair<uint64_t, uint64_t> const& b) { return a.second < b.second; });
    }
 
    std::vector<uint64_t> indices;
    for (auto const& e : indicesAndLevels) {
        indices.emplace_back(e.first);
    }
 
    return indices;
}
 
template<DdType LibraryType>
std::vector<std::pair<uint64_t, uint64_t>> DdMetaVariable<LibraryType>::getIndicesAndLevels() const {
    std::vector<std::pair<uint64_t, uint64_t>> indicesAndLevels;
    for (auto const& v : ddVariables) {
        indicesAndLevels.emplace_back(v.getIndex(), v.getLevel());
    }
 
    return indicesAndLevels;
}
 
template<DdType LibraryType>
uint64_t DdMetaVariable<LibraryType>::getHighestLevel() const {
    uint64_t result = 0;
    bool first = true;
    for (auto const& v : ddVariables) {
        if (first) {
            result = v.getLevel();
            first = false;
        } else {
            result = std::max(result, v.getLevel());
        }
    }
 
    return result;
}
 
template<DdType LibraryType>
uint64_t DdMetaVariable<LibraryType>::getLowestIndex() const {
    return lowestIndex;
}
 
template<DdType LibraryType>
void DdMetaVariable<LibraryType>::createCube() {
    STORM_LOG_ASSERT(!this->ddVariables.empty(), "The DD variables must not be empty.");
    auto it = this->ddVariables.begin();
    this->cube = *it;
    ++it;
    for (auto ite = this->ddVariables.end(); it != ite; ++it) {
        this->cube &= *it;
    }
}
 
template<DdType LibraryType>
void DdMetaVariable<LibraryType>::precomputeLowestIndex() {
    bool first = true;
    for (auto const& var : this->ddVariables) {
        if (first) {
            first = false;
            this->lowestIndex = var.getIndex();
        } else {
            this->lowestIndex = std::min(lowestIndex, var.getIndex());
        }
    }
}
 
template class DdMetaVariable<DdType::CUDD>;
template class DdMetaVariable<DdType::Sylvan>;
}  // namespace dd
}  // namespace storm