C++ int_vector::begin方法代码示例

 /*! \param i Index of the value. \f$ i \in [0..size()-1]\f$.
  * Time complexity: O(1) for small and O(log n) for large values
  */
 inline value_type operator[](size_type i)const {
     if (m_small_lcp[i]!=255) {
         return m_small_lcp[i];
     } else {
         size_type idx = lower_bound(m_big_lcp_idx.begin(),
                                     m_big_lcp_idx.end(),i)
                         - m_big_lcp_idx.begin();
         return m_big_lcp[idx];
     }
 }

bool addKeywordsImg(const int dbId, const int id, int_vector hashes){
	if (!validate_imgid(dbId, id)) { cerr << "ERROR: image id (" << id << ") not found on given dbid (" << dbId << ") or dbid not existant" << endl ; return false;};

	// populate keyword postings
	for (intVectorIterator it = hashes.begin(); it != hashes.end(); it++) {
		getKwdPostings(*it)->imgIdsFilter->insert(id);
	}

	// populate image kwds
	int_hashset& imgKwds = dbSpace[dbId]->sigs[id]->keywords;
	imgKwds.insert(hashes.begin(),hashes.end());
	return true;
}

// query by keywords
std::vector<double> queryImgIDKeywords(const int dbId, long int id, int numres, int kwJoinType, int_vector keywords, bool colorOnly){
	if (!validate_dbid(dbId)) { cerr << "ERROR: database space not found (" << dbId << ")" << endl; return std::vector<double>();}

	if ((id != 0) && !validate_imgid(dbId, id)) { // not search random and image doesnt exist
		cerr << "ERROR: image id (" << id << ") not found on given dbid (" << dbId << ") or dbid not existant" << endl ;
		return std::vector<double>();
	}

	if (keywords.size() < 1) {
		cerr << "ERROR: At least one keyword must be supplied" << endl ;
		return std::vector<double>();
	}

	// populate filter
	intVectorIterator it = keywords.begin();
	bloom_filter* bf = 0;

    // OR or AND each kwd postings filter to get final filter
    // start with the first one
    bf = new bloom_filter(*(getKwdPostings(*it)->imgIdsFilter));
    it++;
    for (; it != keywords.end(); it++) { // iterate the rest
        if (kwJoinType) { // and'd
            (*bf) &= *(getKwdPostings(*it)->imgIdsFilter);
        } else { // or'd
            (*bf) |= *(getKwdPostings(*it)->imgIdsFilter);
        }
    }

	if (id == 0) { // random images with these kwds

		vector<double> V; // select all images with the desired keywords
		for (sigIterator sit = dbSpace[dbId]->sigs.begin(); sit != dbSpace[dbId]->sigs.end(); sit++) {
			if (V.size() > 20*numres) break;

			if ((bf == 0) || (bf->contains((*sit).first))) { // image has desired keyword or we're querying random
				V.insert(V.end(), (*sit).first);
				V.insert(V.end(), 0);
			}
		}

		vector<double> Vres;

		for (int var = 0; var < min(V.size()/2, numres); ) { // var goes from 0 to numres
			int rint = rand()%(V.size()/2);
			if (V[rint*2] > 0) { // havent added this random result yet
				Vres.insert(Vres.end(), V[rint*2] );
				Vres.insert(Vres.end(), 0 );
				V[rint*2] = 0;
				++var;
			}
			++var;
		}

		return Vres;
	}
	return queryImgIDFiltered(dbId, id, numres, bf, colorOnly);

}

bool ternary::encode(const int_vector &v, int_vector &z){
	z.setIntWidth( v.getIntWidth() );
	size_t z_bit_size = 0;
	for(typename int_vector::const_iterator it = v.begin(), end = v.end(); it != end; ++it){
		z_bit_size += encoding_length(*it);
	}
	z.bit_resize( z_bit_size ); // Initial size of z
	if( z_bit_size & 0x3F ){ // if z_bit_size % 64 != 0
		*(z.m_data + (z_bit_size>>6)) = 0; // initialize last word
	}

std::vector<int> const build_vector()
{
    typedef std::vector<int> int_vector;
    static int_vector data = init_vector();
    int_vector::size_type const size = data.size();
    int_vector::iterator it = data.begin();
    int_vector::iterator const end = data.end();
    for (; it != end; ++it)
        *it += size;
    return data;
}

std::unordered_set<int> const build_unordered_set()
{
    typedef std::unordered_set<int> int_set;
    typedef std::vector<int> int_vector;

    int_set result;
    int_vector const data = build_vector();
    int_vector::const_iterator it = data.begin();
    int_vector::const_iterator const end = data.end();
    result.insert(it, end);
    return result;
}

std::map<int, int> const build_map()
{
    typedef std::map<int, int> int_map;
    typedef std::vector<int> int_vector;

    int_map result;
    int_vector const data = build_vector();
    int_vector::const_iterator it = data.begin();
    int_vector::const_iterator const end = data.end();
    for (; it != end; ++it) {
	    int const value = *it;
	    result[value] = 100 * value;
    }
    return result;
}

bool elias_delta::encode(const int_vector& v, int_vector& z)
{
    typedef typename int_vector::size_type size_type;
    z.width(v.width());
    size_type z_bit_size = 0;
    uint64_t w;
    const uint64_t zero_val = v.width() < 64 ? (1ULL)<<v.width() : 0;
    for (typename int_vector::const_iterator it = v.begin(), end = v.end(); it != end; ++it) {
        if ((w=*it) == 0) {
            w = zero_val;
        }
        z_bit_size += encoding_length(w);
    }
    z.bit_resize(z_bit_size);   // Initial size of z
    if (z_bit_size & 0x3F) { // if z_bit_size % 64 != 0
        *(z.m_data + (z_bit_size>>6)) = 0; // initialize last word
    }

		/*! 
		 * Constructor for building the Index
		 * \param[in] str C-string of the text
		 */
		index_sa_text_occ(const unsigned char* str) : index() {

			size_t n = strlen((const char*)str);
			sa = int_vector<>(n+1, 0, bit_magic::l1BP(n+1)+1);
			algorithm::calculate_sa(str, n+1, sa);   // calculate the suffix array sa of str
			setText(str, n+1);

			text = int_vector<>(sa.size(), 0, bit_magic::l1BP(sigma)+1);
			for (size_t i=0; i<sa.size(); i++) text[i] = char2comp[str[i]];

			unsigned char *bwt = new unsigned char[n+1];
			{ /* Calculate Burrows-Wheeler-Transform */
				size_t i = 0;
				for(int_vector<>::const_iterator it = sa.begin(), end = sa.end(); it != end; ++it, ++i){
					bwt[i] = m_char2comp[str[(*it+n)%(n+1)]];
				}
			}
			occ = Occ(bwt, n+1, m_sigma);
			delete[] bwt;
		}

{
	typedef
	std::vector<
		int
	>
	int_vector;

	int_vector const vec1{
		1,
		2
	};

	CHECK(
		fcppt::range::size(
			fcppt::iterator::make_range(
				vec1.begin(),
				vec1.begin()
			)
		)
		==
		0u
	);

	CHECK(
		fcppt::range::size(
			fcppt::iterator::make_range(
				vec1.begin(),
				std::next(
					vec1.begin()
				)
			)

	>
	int_vector;

	int_vector const vec{
		2,
		5,
		7
	};

	CHECK_FALSE(
		fcppt::algorithm::binary_search(
			vec,
			3
		).has_value()
	);

	CHECK(
		fcppt::algorithm::binary_search(
			vec,
			5
		)
		==
		fcppt::optional::make(
			std::next(
				vec.begin(),
				1
			)
		)
	);
}