/usr/include/sdsl/select_support.hpp is in libsdsl-dev 2.0.3-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Copyright (C) 2008 Simon Gog
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see http://www.gnu.org/licenses/ .
*/
/*! \file select_support.hpp
\brief select_support.hpp contains classes that support a sdsl::bit_vector with constant time select information.
\author Simon Gog
*/
#ifndef INCLUDED_SDSL_SELECT_SUPPORT
#define INCLUDED_SDSL_SELECT_SUPPORT
/** \defgroup select_support_group Select Support (SCS)
* This group contains data structures which support an sdsl::bit_vector with the select method.
*/
#include "int_vector.hpp"
#include "rank_support.hpp"
//! Namespace for the succinct data structure library.
namespace sdsl
{
//! The base class of classes supporting select queries for a sdsl::bit_vector in constant time.
/*! Abstract base class for classes supporting select queries.
*/
class select_support
{
protected:
const int_vector<1>* m_v; //!< Pointer to the select supported sdsl::bit_vector.
public:
typedef int_vector<1>::size_type size_type;
const bit_vector* v;
//! Constructor of select_support.
/*! \param v The bit_vector to support rank queries.
*/
select_support(const int_vector<1>* f_v=nullptr):v(f_v) {
m_v = f_v;
}
//! Copy constructor
/*! Copy the whole select_support including the pointer
* to the supported bit_vector.
*/
select_support(const select_support& f_v);
//! Destructor of select_support.
virtual ~select_support() {};
//! Select returns the index of the i-th 1-bit in the supported bit_vector.
/*! \param i Argument to calculate the index of the i-th 1-bit in the supported bit_vector.
\return The index \f$\in [0..v.size()-1]\f$ of the i-th 1-bit in the supported bit_vector.
Call init or load to initialize the data structure before the first call of this method.
\sa init, load.
*/
virtual size_type select(size_type i) const = 0;
//! Alias for select
virtual size_type operator()(size_type i) const = 0;
//! Serialize the select_support to an out file stream.
virtual size_type serialize(std::ostream& out, structure_tree_node* v, std::string name)const = 0;
//! Load the select_support from an in file stream.
/*! Load an previously serialized select_support from a std::istream.
\param in The std::istream to load the select_support.
\param v The bit_vector to be supported.
\sa init, select.
*/
virtual void load(std::istream& in, const int_vector<1>* v=nullptr) = 0;
//! This method sets the supported bit_vector
virtual void set_vector(const int_vector<1>* v=nullptr) = 0;
};
template<uint8_t bit_pattern, uint8_t pattern_len>
struct select_support_trait {
typedef select_support::size_type size_type;
/* Count the number of arguments for the specific select support */
static size_type arg_cnt(const bit_vector&) {
return 0;
}
static size_type args_in_the_first_word(uint64_t, uint8_t, uint64_t) {
return 0;
}
static size_type ith_arg_pos_in_the_first_word(uint64_t, size_type, uint8_t, uint64_t) {
return 0;
}
static size_type args_in_the_word(uint64_t, uint64_t&) {
return 0;
}
static size_type ith_arg_pos_in_the_word(uint64_t, size_type, uint64_t) {
return 0;
}
static bool found_arg(size_type, const bit_vector&) {
return 0;
}
static uint64_t init_carry(const uint64_t*, size_type) {
return 0;
}
static uint64_t get_carry(uint64_t) {
return 0;
}
};
template<>
struct select_support_trait<0,1> {
typedef select_support::size_type size_type;
static size_type arg_cnt(const bit_vector& v) {
return v.bit_size()-util::cnt_one_bits(v);
}
static size_type args_in_the_first_word(uint64_t w, uint8_t offset, uint64_t) {
return bits::cnt((~w)& bits::lo_unset[offset]);
}
static size_type ith_arg_pos_in_the_first_word(uint64_t w, size_type i, uint8_t offset, uint64_t) {
return bits::sel(~w & bits::lo_unset[offset], i);
}
static size_type args_in_the_word(uint64_t w, uint64_t&) {
return bits::cnt(~w);
}
static size_type ith_arg_pos_in_the_word(uint64_t w, size_type i, uint64_t) {
return bits::sel(~w, i);
}
static bool found_arg(size_type i, const bit_vector& v) {
return !v[i];
}
static uint64_t init_carry(const uint64_t*, size_type) {
return 0;
}
static uint64_t get_carry(uint64_t) {
return 0;
}
};
template<>
struct select_support_trait<1,1> {
typedef select_support::size_type size_type;
static size_type arg_cnt(const bit_vector& v) {
return util::cnt_one_bits(v);
}
static size_type args_in_the_first_word(uint64_t w, uint8_t offset, uint64_t) {
return bits::cnt(w & bits::lo_unset[offset]);
}
static size_type ith_arg_pos_in_the_first_word(uint64_t w, size_type i, uint8_t offset, uint64_t) {
return bits::sel(w & bits::lo_unset[offset], i);
}
static size_type args_in_the_word(uint64_t w, uint64_t&) {
return bits::cnt(w);
}
static size_type ith_arg_pos_in_the_word(uint64_t w, size_type i, uint64_t) {
return bits::sel(w, i);
}
static bool found_arg(size_type i, const bit_vector& v) {
return v[i];
}
static uint64_t init_carry(const uint64_t*, size_type) {
return 0;
}
static uint64_t get_carry(uint64_t) {
return 0;
}
};
template<>
struct select_support_trait<10,2> {
typedef select_support::size_type size_type;
static size_type arg_cnt(const bit_vector& v) {
return util::cnt_onezero_bits(v);
}
static size_type args_in_the_first_word(uint64_t w, uint8_t offset, uint64_t carry) {
return bits::cnt(bits::map10(w, carry) & bits::lo_unset[offset]);
}
static size_type ith_arg_pos_in_the_first_word(uint64_t w, size_type i, uint8_t offset, uint64_t carry) {
return bits::sel(bits::map10(w, carry) & bits::lo_unset[offset], i);
}
static size_type args_in_the_word(uint64_t w, uint64_t& carry) {
return bits::cnt10(w, carry);
}
static size_type ith_arg_pos_in_the_word(uint64_t w, size_type i, uint64_t carry) {
return bits::sel(bits::map10(w, carry), i);
}
static bool found_arg(size_type i, const bit_vector& v) {
if (i > 0 and v[i-1] and !v[i])
return true;
return false;
}
static uint64_t init_carry(const uint64_t* data, size_type word_pos) {
return word_pos ? (*(data-1)>>63) : 0;
}
static uint64_t get_carry(uint64_t w) {
return w>>63;
}
};
template<>
struct select_support_trait<01,2> {
typedef select_support::size_type size_type;
static size_type arg_cnt(const bit_vector& v) {
return util::cnt_zeroone_bits(v);
}
static size_type args_in_the_first_word(uint64_t w, uint8_t offset, uint64_t carry) {
return bits::cnt(bits::map01(w, carry) & bits::lo_unset[offset]);
}
static size_type ith_arg_pos_in_the_first_word(uint64_t w, size_type i, uint8_t offset, uint64_t carry) {
return bits::sel(bits::map01(w, carry) & bits::lo_unset[offset], i);
}
static size_type args_in_the_word(uint64_t w, uint64_t& carry) {
return bits::cnt01(w, carry);
}
static size_type ith_arg_pos_in_the_word(uint64_t w, size_type i, uint64_t carry) {
return bits::sel(bits::map01(w, carry), i);
}
static bool found_arg(size_type i, const bit_vector& v) {
if (i > 0 and !v[i-1] and v[i])
return true;
return false;
}
static uint64_t init_carry(const uint64_t* data, size_type word_pos) {
return word_pos ? (*(data-1)>>63) : 1;
}
static uint64_t get_carry(uint64_t w) {
return w>>63;
}
};
} // end namespace sdsl
#include "select_support_mcl.hpp"
#include "select_support_scan.hpp"
#endif
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