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Add estimate for space usage of select data structure #444

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Add estimate for space usage of select data structure #444

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19 changes: 19 additions & 0 deletions include/sdsl/select_support_mcl.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -102,6 +102,8 @@ class select_support_mcl : public select_support
select_support_mcl<t_b, t_pat_len>& operator=(const select_support_mcl& ss);
select_support_mcl<t_b, t_pat_len>& operator=(select_support_mcl&&);
void swap(select_support_mcl<t_b, t_pat_len>& ss);
//! Estimate for the number of bits used by this data structure.
size_t bits_used();
};


Expand Down Expand Up @@ -170,6 +172,23 @@ void select_support_mcl<t_b,t_pat_len>::swap(select_support_mcl& ss)
std::swap(m_arg_cnt, ss.m_arg_cnt);
}

template<uint8_t t_b, uint8_t t_pat_len>
size_t select_support_mcl<t_b,t_pat_len>::bits_used()
{
size_t bits = sizeof(*this)*8;
// number of superblocks in the data structure
size_type sb = (m_arg_cnt+4095)>>12;
if (m_arg_cnt) { // if there exists 1-bits to be supported
bits += m_superblock.capacity() + sizeof(m_superblock)*8;
bits += sb*sizeof(m_longsuperblock[0])*8 + sb*sizeof(m_miniblock[0])*8;
for (size_type i=0; i < sb; ++i) {
bits += (m_longsuperblock == nullptr) ? 0 : m_longsuperblock[i].capacity();
bits += (m_miniblock == nullptr) ? 0 : m_miniblock[i].capacity();
}
}
return bits;
}

template<uint8_t t_b, uint8_t t_pat_len>
void select_support_mcl<t_b,t_pat_len>::copy(const select_support_mcl<t_b, t_pat_len>& ss)
{
Expand Down