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#pragma once
#include "static_hash.h"
#include <library/cpp/deprecated/mapped_file/mapped_file.h>
#include <util/system/filemap.h>
template <class SH>
struct sthash_mapped_c {
typedef SH H;
typedef typename H::const_iterator const_iterator;
TMappedFile M;
H* hsh;
sthash_mapped_c()
: M()
, hsh(nullptr)
{
}
sthash_mapped_c(const char* fname, bool precharge)
: M()
, hsh(nullptr)
{
Open(fname, precharge);
}
void Open(const char* fname, bool precharge) {
M.init(fname);
if (precharge)
M.precharge();
hsh = (H*)M.getData();
if (M.getSize() < sizeof(H) || (ssize_t)M.getSize() != hsh->end().Data - (char*)hsh)
ythrow yexception() << "Could not map hash: " << fname << " is damaged";
}
H* operator->() {
return hsh;
}
const H* operator->() const {
return hsh;
}
H* GetSthash() {
return hsh;
}
const H* GetSthash() const {
return hsh;
}
};
template <class Key, class T, class Hash>
struct sthash_mapped: public sthash_mapped_c<sthash<Key, T, Hash>> {
typedef sthash<Key, T, Hash> H;
sthash_mapped(const char* fname, bool precharge)
: sthash_mapped_c<H>(fname, precharge)
{
}
sthash_mapped()
: sthash_mapped_c<H>()
{
}
};
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