BitMagic-C++
strsvsample04.cpp
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1 /*
2 Copyright(c) 2002-2017 Anatoliy Kuznetsov(anatoliy_kuznetsov at yahoo.com)
3 
4 Licensed under the Apache License, Version 2.0 (the "License");
5 you may not use this file except in compliance with the License.
6 You may obtain a copy of the License at
7 
8  http://www.apache.org/licenses/LICENSE-2.0
9 
10 Unless required by applicable law or agreed to in writing, software
11 distributed under the License is distributed on an "AS IS" BASIS,
12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 See the License for the specific language governing permissions and
14 limitations under the License.
15 
16 For 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 
37 using namespace std;
38 
41 
42 int main(void)
43 {
44  try
45  {
46  // construct container with NULL (unassigned support)
47  str_sv_type str_sv(bm::use_null);
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  {
98  str_sv_type::const_iterator it = str_sv.begin();
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 
main
int main(void)
Definition: strsvsample04.cpp:42
bm::str_sparse_vector::push_back
void push_back(const StrType &str)
push back a string
Definition: bmstrsparsevec.h:532
bm::str_sparse_vector::begin
const_iterator begin() const BMNOEXCEPT
Provide const iterator access to container content
Definition: bmstrsparsevec.h:1700
bm::str_sparse_vector::set_null
void set_null(size_type idx)
set NULL status for the specified element Vector is resized automatically
Definition: bmstrsparsevec.h:1197
bm::bvector<>
bm::use_null
@ use_null
support "non-assigned" or "NULL" logic
Definition: bmconst.h:215
bm::str_sparse_vector::size
size_type size() const
return size of the vector
Definition: bmstrsparsevec.h:637
bm::str_sparse_vector
sparse vector for strings with compression using bit transposition method
Definition: bmstrsparsevec.h:56
bmstrsparsevec.h
string sparse vector based on bit-transposed matrix
bm::str_sparse_vector::get_back_inserter
back_insert_iterator get_back_inserter()
Provide back insert iterator Back insert iterator implements buffered insertion, which is faster,...
Definition: bmstrsparsevec.h:721
bm::str_sparse_vector::end
const_iterator end() const BMNOEXCEPT
Provide const iterator access to the end
Definition: bmstrsparsevec.h:709
bm::str_sparse_vector::size_type
bvector_type::size_type size_type
Definition: bmstrsparsevec.h:63
bm::str_sparse_vector::const_iterator
Const iterator to do quick traverse of the sparse vector.
Definition: bmstrsparsevec.h:167
bm::str_sparse_vector::clear_range
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)
Definition: bmstrsparsevec.h:620
bm::str_sparse_vector::const_iterator::is_null
bool is_null() const BMNOEXCEPT
Get NULL status.
Definition: bmstrsparsevec.h:220
str_sv_type
bm::str_sparse_vector< char, bvector_type, 32 > str_sv_type
Definition: strsvsample04.cpp:40
bm::str_sparse_vector::back_insert_iterator::add_null
void add_null()
add NULL (no-value) to the container
Definition: bmstrsparsevec.h:1933
bm.h
Compressed bit-vector bvector<> container, set algebraic methods, traversal iterators.
bvector_type
bm::bvector bvector_type
Definition: strsvsample04.cpp:39
bm::str_sparse_vector::set
void set(size_type idx, const value_type *str)
set specified element with bounds checking and automatic resize
Definition: bmstrsparsevec.h:1158
bm::str_sparse_vector::assign
void assign(size_type idx, const StrType &str)
set specified element with bounds checking and automatic resize
Definition: bmstrsparsevec.h:494