BitMagic-C++
strsvsample04.cpp
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1/*
2Copyright(c) 2002-2017 Anatoliy Kuznetsov(anatoliy_kuznetsov at yahoo.com)
3
4Licensed under the Apache License, Version 2.0 (the "License");
5you may not use this file except in compliance with the License.
6You may obtain a copy of the License at
7
8 http://www.apache.org/licenses/LICENSE-2.0
9
10Unless required by applicable law or agreed to in writing, software
11distributed under the License is distributed on an "AS IS" BASIS,
12WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13See the License for the specific language governing permissions and
14limitations under the License.
15
16For more information please visit: http://bitmagic.io
17*/
18
19/** \example strsvsample04.cpp
20 Example of how to use bm::str_sparse_vector<> - succinct container for
21 bit-transposed string collections with NULL (unassigned) values support
22
23 \sa bm::str_sparse_vector
24*/
25
26/*! \file strsvsample04.cpp
27 \brief Example: str_sparse_vector<> how to work with NULLs values
28*/
29
30#include <iostream>
31#include <string>
32#include <vector>
33
34#include "bm.h"
35#include "bmstrsparsevec.h"
36
37using namespace std;
38
41
42int main(void)
43{
44 try
45 {
46 // construct container with NULL (unassigned support)
48
49 const char* s0 = "asz1234";
50 std::string str1 = "aqw1234";
51 std::string str3 = "54z";
52 std::string str00 = "00";
53
54 str_sv.set(0, s0); // set a C-string
55 str_sv.push_back(str1); // add from an STL string
56
57 str_sv.assign(3, str3); // assign element 3 from an STL string
58
59 // back-insert iterator can be used to add NULL values
60 {
61 auto bi = str_sv.get_back_inserter();
62 bi = "456"; // add regular value
63 bi.add_null(); // add NULL value explicitly
64 bi = (const char*)0; // add NULL via 0 ptr
65
66 bi.flush(); // flush insert iterator
67 }
68
69 str_sv.set_null(str_sv.size()); // set a NULL element with automatic resize
70
71 // please note that container automatically resizes
72 std::cout << "sv size()=" << str_sv.size() << endl; // 4
73
74
75 // print out the container content using [] reference
76 //
77 for (str_sv_type::size_type i = 0; i < str_sv.size(); ++i)
78 {
79 if (str_sv[i].is_null())
80 cout << i << ":NULL" << endl;
81 else
82 {
83 const char* s = str_sv[i];
84 cout << i << ":" << s << endl;
85 }
86 } // for i
87 cout << endl;
88
89 // clear vector elements in [4, 7] closed interval
90 // and set elements to NULL
91 //
92 str_sv.clear_range(4, 7, true);
93
94
95 // print content using const_iterator which also supports is_null()
96 //
97 {
99 str_sv_type::const_iterator it_end = str_sv.end();
100 for (; it != it_end; ++it)
101 {
102 if (it.is_null())
103 cout << "NULL" << endl;
104 else
105 cout << *it << endl;
106 } // for it
107 }
108 }
109 catch(std::exception& ex)
110 {
111 std::cerr << ex.what() << std::endl;
112 return 1;
113 }
114
115
116 return 0;
117}
118
Compressed bit-vector bvector<> container, set algebraic methods, traversal iterators.
string sparse vector based on bit-transposed matrix
Bitvector Bit-vector container with runtime compression of bits.
Definition bm.h:108
void add_null()
add NULL (no-value) to the container
Const iterator to do quick traverse of the sparse vector.
bool is_null() const BMNOEXCEPT
Get NULL status.
sparse vector for strings with compression using bit transposition method
bvector_type::size_type size_type
str_sparse_vector< CharType, BV, MAX_STR_SIZE > & clear_range(size_type left, size_type right, bool set_null=false)
clear range (assign bit 0 for all plains)
back_insert_iterator get_back_inserter()
Provide back insert iterator Back insert iterator implements buffered insertion, which is faster,...
const_iterator end() const BMNOEXCEPT
Provide const iterator access to the end
void push_back(const StrType &str)
push back a string
size_type size() const
return size of the vector
void set(size_type idx, const value_type *str)
set specified element with bounds checking and automatic resize
void set_null(size_type idx)
set NULL status for the specified element Vector is resized automatically
const_iterator begin() const BMNOEXCEPT
Provide const iterator access to container content
void assign(size_type idx, const StrType &str)
set specified element with bounds checking and automatic resize
@ use_null
support "non-assigned" or "NULL" logic
Definition bmconst.h:215
bm::str_sparse_vector< char, bvector_type, 32 > str_sv_type
bm::bvector bvector_type
int main(void)