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Declare saveIndex/loadIndex as templates to use custom streams #556

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Declare saveIndex/loadIndex as templates to use custom streams #556

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23 changes: 20 additions & 3 deletions hnswlib/hnswalg.h
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Original file line number Diff line number Diff line change
Expand Up @@ -85,6 +85,16 @@ class HierarchicalNSW : public AlgorithmInterface<dist_t> {
loadIndex(location, s, max_elements);
}

template<class stream_t>
HierarchicalNSW(
stream_t &stream,
SpaceInterface<dist_t> *s,
bool nmslib = false,
size_t max_elements = 0,
bool allow_replace_deleted = false)
: allow_replace_deleted_(allow_replace_deleted) {
loadIndexFromStream(stream, s, max_elements);
}

HierarchicalNSW(
SpaceInterface<dist_t> *s,
Expand Down Expand Up @@ -684,7 +694,11 @@ class HierarchicalNSW : public AlgorithmInterface<dist_t> {

void saveIndex(const std::string &location) {
std::ofstream output(location, std::ios::binary);

saveIndexToStream(output);
}

template<typename stream_t>
void saveIndexToStream(stream_t &output) {
writeBinaryPOD(output, offsetLevel0_);
writeBinaryPOD(output, max_elements_);
writeBinaryPOD(output, cur_element_count);
Expand All @@ -711,17 +725,20 @@ class HierarchicalNSW : public AlgorithmInterface<dist_t> {
output.close();
}


void loadIndex(const std::string &location, SpaceInterface<dist_t> *s, size_t max_elements_i = 0) {
std::ifstream input(location, std::ios::binary);

if (!input.is_open())
throw std::runtime_error("Cannot open file");
loadIndexFromStream(input, s, max_elements_i);
}

template<typename stream_t>
void loadIndexFromStream(stream_t &input, SpaceInterface<dist_t> *s, size_t max_elements_i = 0) {
clear();
// get file size:
input.seekg(0, input.end);
std::streampos total_filesize = input.tellg();
auto total_filesize = input.tellg();
input.seekg(0, input.beg);

readBinaryPOD(input, offsetLevel0_);
Expand Down
8 changes: 4 additions & 4 deletions hnswlib/hnswlib.h
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Original file line number Diff line number Diff line change
Expand Up @@ -157,13 +157,13 @@ class pairGreater {
}
};

template<typename T>
static void writeBinaryPOD(std::ostream &out, const T &podRef) {
template<typename stream_t, typename T>
static void writeBinaryPOD(stream_t &out, const T &podRef) {
out.write((char *) &podRef, sizeof(T));
}

template<typename T>
static void readBinaryPOD(std::istream &in, T &podRef) {
template<typename stream_t, typename T>
static void readBinaryPOD(stream_t &in, T &podRef) {
in.read((char *) &podRef, sizeof(T));
}

Expand Down